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0024336: Content of OCCT documentation should be updated. Iter 2

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Finalized STEP and IGES
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ysn 2013-11-14 11:47:14 +04:00 committed by bugmaster
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105
dox/user_guides/draw_test_harness.md
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@ -1484,7 +1484,7 @@ vhlrtype algo_type={algo|polyalgo} [shape_1 ... shape_n]
Changes the type of HLR algorithm used for shapes. Changes the type of HLR algorithm used for shapes.
If the algo_type is algo, the exact HLR algorithm is used, otherwise the polygonal algorithm is used for defined shapes. If the algo_type is algo, the exact HLR algorithm is used, otherwise the polygonal algorithm is used for defined shapes.
If no shape is specified through the command arguments, the given HLR algorithm_type is applied to all *AIS_Shape* isntances in the current context, and the command also changes the default HLR algorithm type. If no shape is specified through the command arguments, the given HLR algorithm_type is applied to all *AIS_Shape* instances in the current context, and the command also changes the default HLR algorithm type.
**Note** that this command works with instances of *AIS_Shape* or derived classes only, other interactive object types are ignored. **Note** that this command works with instances of *AIS_Shape* or derived classes only, other interactive object types are ignored.
@ -1494,108 +1494,147 @@ If no shape is specified through the command arguments, the given HLR algorithm_
@subsubsection occt_draw_4_3_1 vdisplay @subsubsection occt_draw_4_3_1 vdisplay
Syntax: Syntax:
~~~~~
vdisplay name1 [name2] … [name n] vdisplay name1 [name2] … [name n]
~~~~~
Displays named objects. Displays named objects.
**Example:**
**Example:**
~~~~~
vinit vinit
box b 40 40 40 10 10 10 box b 40 40 40 10 10 10
psphere s 20 psphere s 20
vdisplay s b vdisplay s b
vfit vfit
~~~~~
@subsubsection occt_draw_4_3_2 vdonly
@subsubsection occt_draw_4_32 vdonly Syntax:
~~~~~
Syntax: vdonly [name1] … [name n] vdonly [name1] … [name n]
~~~~~
Displays only selected or named objects. If there are no selected or named objects, nothing is done. Displays only selected or named objects. If there are no selected or named objects, nothing is done.
**Example:**
**Example:**
~~~~~
vinit vinit
box b 40 40 40 10 10 10 box b 40 40 40 10 10 10
psphere s 20 psphere s 20
vdonly b vdonly b
vfit vfit
@subsubsection occt_draw_4_33 vdisplayall ~~~~~
Syntax: vdisplayall @subsubsection occt_draw_4_3_3 vdisplayall
Syntax:
~~~~~
vdisplayall
~~~~~
Displays all created objects. Displays all created objects.
**Example:**
**Example:**
~~~~~
vinit vinit
box b 40 40 40 10 10 10 box b 40 40 40 10 10 10
psphere s 20 psphere s 20
vdisplayall vdisplayall
vfit vfit
@subsubsection occt_draw_4_34 verase ~~~~~
Syntax: verase [name1] [name2] … [name n] @subsubsection occt_draw_4_3_4 verase
Syntax:
~~~~~
verase [name1] [name2] … [name n]
~~~~~
Erases some selected or named objects. If there are no selected or named objects, the whole viewer is erased. Erases some selected or named objects. If there are no selected or named objects, the whole viewer is erased.
**Example:**
**Example:**
~~~~~
vinit vinit
box b1 40 40 40 10 10 10 box b1 40 40 40 10 10 10
box b2 -40 -40 -40 10 10 10 box b2 -40 -40 -40 10 10 10
psphere s 20 psphere s 20
vdisplayall vdisplayall
vfit vfit
# erase only first box # erase only the first box
verase b1 verase b1
# erase second box and sphere # erase the second box and sphere
verase verase
@subsubsection occt_draw_4_35 veraseall ~~~~~
Syntax: veraseall @subsubsection occt_draw_4_3_5 veraseall
Syntax:
~~~~~
veraseall
~~~~~
Erases all objects displayed in the viewer. Erases all objects displayed in the viewer.
**Example:** **Example:**
~~~~~
vinit vinit
box b1 40 40 40 10 10 10 box b1 40 40 40 10 10 10
box b2 -40 -40 -40 10 10 10 box b2 -40 -40 -40 10 10 10
psphere s 20 psphere s 20
vdisplayall vdisplayall
vfit vfit
# erase only first box # erase only the first box
verase b1 verase b1
# erase second box and sphere # erase the second box and sphere
verseall verseall
~~~~~
@subsubsection occt_draw_4_36 vsetdispmode @subsubsection occt_draw_4_3_6 vsetdispmode
Syntax: vsetdispmode [name] mode(0,1,2,3) Syntax:
~~~~~
vsetdispmode [name] mode(0,1,2,3)
~~~~~
Sets display mode for all, selected or named objects to the following values:
* **0** - WireFrame,
* **1** - Shading,
* **2** - Quick HideLineremoval,
* **3** - Exact HideLineremoval.
Sets display mode for all, selected or named objects.
**mode** is **0** (**WireFrame**), **1** (**Shading**), **2** (**Quick HideLineremoval**), **3** (**Exact HideLineremoval**).
**Example:** **Example:**
~~~~~
vinit vinit
box b 10 10 10 box b 10 10 10
vdisplay b vdisplay b
vsetdispmode 1 vsetdispmode 1
vfit vfit
@subsubsection occt_draw_4_37 vdisplaytype ~~~~~
@subsubsection occt_draw_4_39 vtypes
Syntax: vdisplaytype type Syntax: vtypes
Displays all objects of a given type. Makes a list of known types and signatures in AIS.
Possible **type**s are **;Point;, ;Axis;, ;Trihedron;, ;PlaneTrihedron;, ;Line;, ;Circle;, ;Plane;, ;Shape;, ;ConnectedShape;, ;MultiConn.Shape;, ;ConnectedInter.;, ;MultiConn.;, ;Constraint; **and** ;Dimension; **(see **vtypes**).
@subsubsection occt_draw_4_38 verasetype @subsubsection occt_draw_4_3_7 vdisplaytype
Syntax:
~~~~~
vdisplaytype type
~~~~~
Displays all objects of a given type. The following types are possible: **Point, Axis, Trihedron, PlaneTrihedron, Line, Circle, Plane, Shape, ConnectedShape, MultiConn.Shape, ConnectedInter., MultiConn., Constraint** and **Dimension**.
@subsubsection occt_draw_4_3_8 verasetype
Syntax: verasetype type Syntax: verasetype type
Erases all objects of a given type. Erases all objects of a given type.
Possible** type**s are **;Point;, ;Axis;, ;Trihedron;, ;PlaneTrihedron;, ;Line;, ;Circle;, ;Plane;, ;Shape;, ;ConnectedShape;, ;MultiConn.Shape;, ;ConnectedInter.;, ;MultiConn.;, ;Constraint; **and **;Dimension; **(see **vtypes**). Possible** type**s are **;Point;, ;Axis;, ;Trihedron;, ;PlaneTrihedron;, ;Line;, ;Circle;, ;Plane;, ;Shape;, ;ConnectedShape;, ;MultiConn.Shape;, ;ConnectedInter.;, ;MultiConn.;, ;Constraint; **and **;Dimension; **(see **vtypes**).
@subsubsection occt_draw_4_39 vtypes
Syntax: vtypes
Makes a list of known types and signatures in AIS.
@subsubsection occt_draw_4_310 vsetcolor @subsubsection occt_draw_4_310 vsetcolor

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dox/user_guides/iges/iges.md
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432
dox/user_guides/step/step.md
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@ -23,17 +23,17 @@ You can translate a STEP file into an OCCT shape in the following steps:
5. fetch the results. 5. fetch the results.
@subsection occt_step_2_2 Domain covered @subsection occt_step_2_2 Domain covered
@subsubsection occt_step_2_2_1 Assemblies @subsubsection occt_step_2_2_1 Assemblies
The **ProSTEP Round Table Agreement Log** (version July 1998), item 21, defines two alternatives for the implementation of assembly structure representations: using mapped_item entities and using representation_relationship_with_transformation entities. Both these alternative representations are recognized and processed at reading. On writing, the second alternative is always employed. The **ProSTEP Round Table Agreement Log** (version July 1998), item 21, defines two alternatives for the implementation of assembly structure representations: using *mapped_item entities* and using *representation_relationship_with_transformation* entities. Both these alternative representations are recognized and processed at reading. On writing, the second alternative is always employed.
Handling of assemblies is implemented in two separate levels: firstly STEP assembly structures are translated into OCCT shapes, and secondly the OCCT shape representing the assembly is converted into any data structure intended for representing assemblies (for example, OCAF). Handling of assemblies is implemented in two separate levels: firstly STEP assembly structures are translated into OCCT shapes, and secondly the OCCT shape representing the assembly is converted into any data structure intended for representing assemblies (for example, OCAF).
The first part of this document describes the basic STEP translator implementing translation of the first level, i.e. translation to OCCT Shapes. On this level, the acyclic graph representing the assembly structure in a STEP file is mapped into the structure of nested TopoDS_Compounds in Open CASCADE Technology. The (sub)assemblies become (sub)compounds containing shapes which are the results of translating components of that (sub)assembly. The sharing of components of assemblies is preserved as Open CASCADE Technology sharing of subshapes in compounds. The first part of this document describes the basic STEP translator implementing translation of the first level, i.e. translation to OCCT Shapes. On this level, the acyclic graph representing the assembly structure in a STEP file is mapped into the structure of nested *TopoDS_Compounds* in Open CASCADE Technology. The (sub)assemblies become (sub)compounds containing shapes which are the results of translating components of that (sub)assembly. The sharing of components of assemblies is preserved as Open CASCADE Technology sharing of subshapes in compounds.
The attributive information attached to assembly components in a STEP file (such as names and descriptions of products, colors, layers etc.) can be translatd after the translation of the shape itself by parsing the STEP model (loaded in memory). Several tools from the package STEPConstruct provide functionalities to read styles (colors), validation properties, product information etc. The attributive information attached to assembly components in a STEP file (such as names and descriptions of products, colors, layers etc.) can be translatd after the translation of the shape itself by parsing the STEP model (loaded in memory). Several tools from the package STEPConstruct provide functionalities to read styles (colors), validation properties, product information etc.
Implementation of the second level of translation (conversion to XDE data structure) is provided by XDE STEP translator. Implementation of the second level of translation (conversion to XDE data structure) is provided by XDE STEP translator.
@subsubsection occt_step_2_2_2 Shape representations @subsubsection occt_step_2_2_2 Shape representations
Length units, plane angle units and the uncertainty value are taken from shape_representation entities. This data is used in the translation process. Length units, plane angle units and the uncertainty value are taken from *shape_representation* entities. This data is used in the translation process.
The types of STEP representation entities that are recognized are: The types of STEP representation entities that are recognized are:
* advanced_brep_shape_representation * advanced_brep_shape_representation
@ -420,7 +420,7 @@ There are three selection possibilities. You can select:
* a list of entities, * a list of entities,
* one entity. * one entity.
<h5>Whole file</h5> <h5>The whole file</h5>
Transferring the whole file means transferring all root entities. The number of roots can be evaluated when the file is loaded: Transferring the whole file means transferring all root entities. The number of roots can be evaluated when the file is loaded:
~~~~~ ~~~~~
@ -428,7 +428,7 @@ Standard_Integer NbRoots = reader.NbRootsForTransfer();
Standard_Integer num = reader.TransferRoots(); Standard_Integer num = reader.TransferRoots();
~~~~~ ~~~~~
<h4>List of entities</h4> <h5>List of entities</h5>
A list of entities can be formed by invoking *STEP214Control_Reader::GiveList* (this is a method of the parent class). A list of entities can be formed by invoking *STEP214Control_Reader::GiveList* (this is a method of the parent class).
Here is a simple example of how a list is translated: Here is a simple example of how a list is translated:
@ -499,129 +499,99 @@ Tables given in this paragraph show the mapping of STEP entities to OCCT objects
Not all entities defining the assembly structure in the STEP file are translated to OCCT shapes, but they are used to identify the relationships between assemblies and their components. Since the graph of ‘natural’ dependencies of entities based on direct references between them does not include the references from assemblies to their components, these dependencies are introduced in addition to the former ones. This is made basing on the analysis of the following entities describing the structure of the assembly. Not all entities defining the assembly structure in the STEP file are translated to OCCT shapes, but they are used to identify the relationships between assemblies and their components. Since the graph of ‘natural’ dependencies of entities based on direct references between them does not include the references from assemblies to their components, these dependencies are introduced in addition to the former ones. This is made basing on the analysis of the following entities describing the structure of the assembly.
| STEP entity type | CASCADE shape | Comments | | STEP entity type | CASCADE shape | Comments |
| :--------------- | :-------------- | :------ |
product_definition For assemblies, a TopoDS_Compound, | product_definition | A *TopoDS_Compound* for assemblies, a CASCADE shape corresponding to the component type of for components, | Each assembly or component has its own *product_definition*. It is used as a starting point for translation when *read.step.product.mode* is ON. |
for components, a CASCADE shape corresponding to the type of component Each assembly or component has its own product_definition. It is used as a starting point for translation when read.step.product.mode is ON | product_definition_shape | | This entity provides a link between *product_definition* and corresponding *shape_definition_representation*, or between *next_assembly_usage_occurence* and corresponding *context_dependent_shape_representation*. |
product_definition_shape This entity provides a link between product_definition and corresponding shape_definition_representation, or between next_assembly_usage_occurence and corresponding context_dependent_shape_representation | shape_definition_representation | A TopoDS_Compound for assemblies, a CASCADE shape corresponding to the component type for components. | Each assembly or component has its own *shape_definition_representation*. The graph of dependencies is modified in such a way that *shape_definition_representations* of all components of the assembly are referred by the *shape_definition_representation* of the assembly. |
shape_definition_representation For assemblies, a TopoDS_Compound, | next_assembly_usage_occurence | | This entity defines a relationship between the assembly and its component. It is used to introduce (in the dependencies graph) the links between *shape_definition_representation* of the assembly and *shape_definition_representations* and *context_dependent_shape_representations* of all its components. |
for components, a CASCADE shape corresponding to the type of component Each assembly or component has its own shape_definition_representation. The graph of dependencies is modified in such a way that shape_definition_representations of all components of the assembly are referred by the shape_definition_representation of the assembly. | mapped_item | TopoDS_Shape | This entity defines a mapping of the assembly component into the *shape_representation* of the assembly. The result of translation is a CASCADE shape translated from the component, to which transformation defined by the *mapped_item* is applied. |
next_assembly_usage_occurence This entity defines a relationship between the assembly and its component. It is used to introduce (in the dependencies graph) the links between shape_definition_representation of the assembly and shape_definition_representations and context_dependent_shape_representations of all its components. | context_dependent_shape_representation | TopoDS_Shape | This entity is associated with the *next_assembly_usage_occurence* entity and defines a placement of the component in the assembly. The graph of dependencies is modified so that each context_dependent_shape_representation* is referred by shape_definition_representation of the corresponding assembly. |
mapped_item TopoDS_Shape This entity defines a mapping of the assembly component into the shape_representation of the assembly. The result of translation is a CASCADE shape translated from the component, to which transformation defined by the mapped_item is applied. | shape_representation_relationship_with_transformation | | This entity is associated with *context_dependent_shape_representation* and defines a transformation necessary to apply to the component in order to locate it in its place in the assembly. |
context_dependent_shape_representation TopoDS_Shape This entity is associated with the next_assembly_usage_occurence entity and defines a placement of the component in the assembly. The graph of dependencies is modified so that each context_dependent_shape_representation is referred by shape_definition_representation of the corresponding assembly. | item_defined_transformation | | This entity defines a transformation operator used by *shape_representation_relationship_with_transformation* or *mapped_item* entity |
shape_representation_relationship_with_transformation This entity is associated with context_dependent_shape_representation and defines a transformation necessary to apply to the component in order to locate it in its place in the assembly. | cartesian_transformation_operator | | This entity defines a transformation operator used by *shape_representation_relationship_with_transformation* or *mapped_item* entity |
item_defined_transformation This entity defines a transformation operator used by shape_representation_relationship_with_transformation or mapped_item entity
cartesian_transformation_operator This entity defines a transformation operator used by shape_representation_relationship_with_transformation or mapped_item entity
@subsubsection occt_step_2_4_2 Models @subsubsection occt_step_2_4_2 Models
STEP entity type CASCADE shape Comments | STEP entity type | CASCADE shape | Comments |
Solid Models | :-------------- | :----------- | :---------- |
brep_with_voids TopoDS_Solid | Solid Models | | |
faceted_brep TopoDS_Solid | brep_with_voids | TopoDS_Solid | |
manifold_solid_brep TopoDS_Solid | faceted_brep | TopoDS_Solid | |
Surface Models | manifold_solid_brep | TopoDS_Solid | |
shell_based_surface_model TopoDS_Compound shell_based_surface_model is translated into one or more TopoDS_Shell grouped in a TopoDS_Compound | Surface Models | | |
geometric_set TopoDS_Compound TopoDS_Compound contains only TopoDS_Faces, TopoDS_Wires, TopoDS_Edges and/or TopoDS_Vertices | shell_based_surface_model | TopoDS_Compound | *shell_based_surface_model* is translated into one or more *TopoDS_Shell* grouped in a *TopoDS_Compound* |
Wireframe Models | geometric_set | TopoDS_Compound | *TopoDS_Compound* contains only *TopoDS_Faces*, *TopoDS_Wires*, *TopoDS_Edges* and/or *TopoDS_Vertices*.
geometric_curve_set TopoDS_Compound TopoDS_Compound contains only TopoDS_Wires, TopoDS_Edges and/or TopoDS_Vertices | Wireframe Models | | |
| geometric_curve_set | TopoDS_Compound | *TopoDS_Compound* contains only *TopoDS_Wires*, *TopoDS_Edges* and/or *TopoDS_Vertices*.
@subsubsection occt_step_2_4_3 Topological entities @subsubsection occt_step_2_4_3 Topological entities
STEP entity type CASCADE shape Comments
Vertices
vertex_point TopoDS_Vertex
Edges
oriented_edge TopoDS_Edge
edge_curve TopoDS_Edge
Loops
face_bound TopoDS_Wire
face_outer_bound TopoDS_Wire
edge_loop TopoDS_Wire
poly_loop TopoDS_Wire Each segment of poly_loop is translated into TopoDS_Edge with support of Geom_Line
vertex_loop TopoDS_Wire Resulting TopoDS_Wire contains only one degenerated TopoDS_Edge
Faces
face_surface TopoDS_Face
advanced_face TopoDS_Face
Shells
connected_face_set TopoDS_Shell
oriented_closed_shell TopoDS_Shell
closed_shell TopoDS_Shell
open_shell TopoDS_Shell
| Topology | STEP entity type | CASCADE shape | Comments |
| :------- | :--------- | :-------- | :----- |
| Vertices | vertex_point | TopoDS_Vertex | |
| Edges | oriented_edge | TopoDS_Edge | |
| | edge_curve | TopoDS_Edge | |
| Loops | face_bound | TopoDS_Wire | |
| | face_outer_bound | TopoDS_Wire | |
| | edge_loop | TopoDS_Wire | |
| | poly_loop | TopoDS_Wire | Each segment of *poly_loop* is translated into *TopoDS_Edge* with support of *Geom_Line* |
| | vertex_loop | TopoDS_Wire | Resulting *TopoDS_Wire* contains only one degenerated *TopoDS_Edge* |
| Faces | face_surface | TopoDS_Face | |
| | advanced_face | TopoDS_Face | |
| Shells | connected_face_set | TopoDS_Shell | |
| | oriented_closed_shell | TopoDS_Shell | |
| | closed_shell | TopoDS_Shell | |
| | open_shell | TopoDS_Shell | |
@subsubsection occt_step_2_4_4 Geometrical entities @subsubsection occt_step_2_4_4 Geometrical entities
3D STEP entities are translated into geometrical objects from the Geom package while 2D entities are translated into objects from the Geom2d package. 3D STEP entities are translated into geometrical objects from the *Geom* package while 2D entities are translated into objects from the *Geom2d* package.
STEP entity type CASCADE object Comments | Geometry | STEP entity type | CASCADE object | Comments |
Points | :------ | :-------- | :------ | :-------- |
cartesian_point Geom_CartesianPoint | Points | cartesian_point | Geom_CartesianPoint, Geom2d_CartesianPoint | |
Geom2d_CartesianPoint | Directions | direction | Geom_Direction, Geom2d_Direction | |
Directions | Vectors | vector | Geom_VectorWithMagnitude, Geom2d_VectorWithMagnitude | |
direction Geom_Direction | Placements | axis1_placement | Geom_Axis1Placement | |
Geom2d_Direction | | axis2_placement_2d | Geom2d_AxisPlacement | |
Vectors | | axis2_placement_3d | Geom_Axis2Placement | |
vector Geom_VectorWithMagnitude | Curves | circle | Geom_Circle, Geom2d_Circle, Geom2d_BsplineCurve | Circle is translated into *Geom2d_BSplineCurve* when it references the surface of revolution (spherical surface, conical surface, etc.) |
Geom2d_VectorWithMagnitude | | ellipse | Geom_Ellipse, Geom2d_Ellipse, Geom2d_BsplineCurve | Ellipse is translated into *Geom2d_BSplineCurve* when it references the surface of revolution (spherical surface, conical surface, etc.) |
Placements | | hyperbola | Geom_Hyperbola, Geom2d_Hyperbola | |
axis1_placement Geom_Axis1Placement | | line | Geom_Line, Geom2d_Line | |
axis2_placement_2d Geom2d_AxisPlacement | | parabola | Geom_Parabola, Geom2d_Parabola | |
axis2_placement_3d Geom_Axis2Placement | | pcurve | Geom2d_Curve | Pcurve in edge |
Curves | | curve_replica | Geom_Curve or Geom2d_Curve | Depending on the type of the base curve |
circle Geom_Circle | | offset_curve_3d | Geom_OffsetCurve | |
Geom2d_Circle | | trimmed_curve | Geom_TrimmedCurve or Geom2d_BsplineCurve | Only trimmed_curves trimmed by parameters are translated. All *trimmed_curves* are converted to *Geom2d_BSplineCurve*. |
Geom2d_BsplineCurve Circle is translated into Geom2d_BSplineCurve when it references the surface of revolution (spherical surface, conical surface, etc.) | | b_spline_curve | Geom_BsplineCurve or Geom2d_BsplineCurve | |
ellipse Geom_Ellipse | | b_spline_curve_with_knots | Geom_BsplineCurve or Geom2d_BsplineCurve | |
Geom2d_Ellipse | | bezier_curve | Geom_BsplineCurve or Geom2d_BsplineCurve | |
Geom2d_BsplineCurve Ellipse is translated into Geom2d_BSplineCurve when it references the surface of revolution (spherical surface, conical surface, etc.) | | rational_b_spline_curve | Geom_BsplineCurve or Geom2d_BsplineCurve | |
hyperbola Geom_Hyperbola | | uniform_curve | Geom_BsplineCurve or Geom2d_BsplineCurve | |
Geom2d_Hyperbola | | quasi_ uniform_curve | Geom_BsplineCurve or Geom2d_BsplineCurve | |
line Geom_Line | | surface_curve | TopoDS_Edge | *surface_curve* defines geometrical support of an edge and its pcurves. |
Geom2d_Line | | seam_curve | TopoDS_Edge | The same as *surface_curve* |
parabola Geom_Parabola | | composite_curve_segment | TopoDS_Edge | as a segment of *composite_curve* |
Geom2d_Parabola | | composite_curve | TopoDS_Wire | |
pcurve Geom2d_Curve Pcurve in edge | | composite_curve_on_surface | TopoDS_Wire | |
curve_replica Geom_Curve Depending on the type of basis curve | | boundary_curve | TopoDS_Wire | |
Geom2d_Curve | Surfaces | b_spline_surface | Geom_BsplineSurface | |
offset_curve_3d Geom_OffsetCurve | | b_spline_surface_with_knots | Geom_BsplineSurface | |
trimmed_curve Geom_TrimmedCurve | | bezier_surface | Geom_BSplineSurface | |
Geom2d_BsplineCurve Only trimmed_curves trimmed by parameters are translated. All trimmed_curves are converted to Geom2d_BSplineCurve. | | conical_surface | Geom_ConicalSurface | |
b_spline_curve Geom_BsplineCurve | | cylindrical_surface | Geom_CylindricalSurface | |
Geom2d_BsplineCurve | | offset_surface | Geom_OffsetSurface | |
b_spline_curve_with_ | | surface_replica | Geom_Surface | Depending on the type of basis surface |
knots Geom_BsplineCurve | | plane | Geom_Plane | |
Geom2d_BsplineCurve | | rational_b_spline_surface | Geom_BSplineSurface | |
bezier_curve Geom_BsplineCurve | | rectangular_trimmed_surface | Geom_RectangularTrimmedSurface | |
Geom2d_BsplineCurve | | spherical_surface | Geom_SphericalSurface | |
rational_b_spline_curve Geom_BsplineCurve | | surface_of_linear_extrusion | Geom_SurfaceOfLinearExtrusion | |
Geom2d_BsplineCurve | | surface_of_revolution | Geom_SurfaceOfRevolution | |
uniform_curve Geom_BsplineCurve | | toroidal_surface | Geom_ToroidalSurface | |
Geom2d_BsplineCurve | | degenerate_toroidal_surface | Geom_ToroidalSurface | |
quasi_ uniform_curve Geom_BsplineCurve | | uniform_surface | Geom_BSplineSurface | |
Geom2d_BsplineCurve | | quasi_uniform_surface | Geom_BSplineSurface | |
surface_curve TopoDS_Edge surface_curve defines geometrical support of an edge and its pcurves. | | rectangular_composite_surface | TopoDS_Compound | Contains *TopoDS_Faces* |
seam_curve TopoDS_Edge the same as surface_curve | | curve_bounded_surface | TopoDS_Face | |
composite_curve_segment TopoDS_Edge as a segment of composite_curve
composite_curve TopoDS_Wire
composite_curve_on_surface TopoDS_Wire
boundary_curve TopoDS_Wire
Surfaces
b_spline_surface Geom_BsplineSurface
b_spline_surface_with_knots Geom_BsplineSurface
bezier_surface Geom_BSplineSurface
conical_surface Geom_ConicalSurface
cylindrical_surface Geom_CylindricalSurface
offset_surface Geom_OffsetSurface
surface_replica Geom_Surface Depending on the type of basis surface
plane Geom_Plane
rational_b_spline_surface Geom_BSplineSurface
rectangular_trimmed_
surface Geom_RectangularTrimmedSurface
spherical_surface Geom_SphericalSurface
surface_of_linear_extrusion Geom_SurfaceOfLinearExtrusion
surface_of_revolution Geom_SurfaceOfRevolution
toroidal_surface Geom_ToroidalSurface
degenerate_toroidal_surface Geom_ToroidalSurface
uniform_surface Geom_BSplineSurface
quasi_uniform_surface Geom_BSplineSurface
rectangular_composite_surface TopoDS_Compound Contains TopoDS_Faces
curve_bounded_surface TopoDS_Face
@subsection occt_step_2_5 Tolerance management @subsection occt_step_2_5 Tolerance management
@ -845,27 +815,7 @@ defines the version of schema used for the output STEP file:
* 2 or ;AP214DIS;: AP214, DIS version (dated 15 September 1998). * 2 or ;AP214DIS;: AP214, DIS version (dated 15 September 1998).
* 3 or ;AP203;: AP203, possibly with modular extensions (depending on data written to a file). * 3 or ;AP203;: AP203, possibly with modular extensions (depending on data written to a file).
* 4 or *AP214IS*: AP214, IS version (dated 2002) * 4 or *AP214IS*: AP214, IS version (dated 2002)
This parameter affects the following entities written to the STEP file:
AP214, CD version AP214, DIS version AP214,IS version AP203
FILE_SCHEMA( (`AUTOMOTIVE_DESIGN_CC2 { 1 2 10303 214 -1 1 5 4}')) FILE_SCHEMA( (`AUTOMOTIVE_DESIGN { 1 2 10303 214 0 1 1 1}')) FILE_SCHEMA(
('AUTOMOTIVE_DESIGN
{ 1 0 10303 214 1 1 1 1 }')) FILE_SCHEMA( (`CONFIG_CONTROL_DESIGN'))
APPLICATION_PROTOCOL_ DEFINITION
`committee draft',
`automotive_design'
,1997,##) APPLICATION_PROTOCOL_ DEFINITION(
'draft international standard',
'automotive_design',
1998,##) APPLICATION_PROTOCOL_DEFINITION
('international standard', ‘automotive_design',
2000,##); APPLICATION_PROTOCOL_ DEFINITION
('international standard', 'config_control_design',1994,##)
APPLICATION_CONTEXT( 'core data for automotive mechanical design processes') APPLICATION_CONTEXT( ‘configuration controlled 3D designs of mechanical parts and assemblies' )
PRODUCT_TYPE(`part',$,(##)) PRODUCT_RELATED_PRODUCT_CATEGORY( `part',$,(##))
MECHANICAL_CONTEXT(`',##, 'mechanical') PRODUCT_CONTEXT(`',##, 'mechanical') PRODUCT_CONTEXT('',##,'mechanical'); MECHANICAL_CONTEXT(`',##, 'mechanical')
In addition, in AP203 mode more product and organizational entities are generated (entities like PERSON_AND_ORGANIZATION, SECURITY_CLASSIFICATION etc., as required by AP203).
Read this parameter with: Read this parameter with:
~~~~~ ~~~~~
TCollection_AsciiString schema = Interface_Static::CVal("write.step.schema"); TCollection_AsciiString schema = Interface_Static::CVal("write.step.schema");
@ -930,7 +880,7 @@ The following values of enumeration are allowed:
* *STEPControl_ShellBasedSurfaceModel* resulting entity is *shell_based_surface_model*; * *STEPControl_ShellBasedSurfaceModel* resulting entity is *shell_based_surface_model*;
* *STEPControl_GeometricCurveSet* resulting entity is *geometric_curve_set*; * *STEPControl_GeometricCurveSet* resulting entity is *geometric_curve_set*;
The following table shows which shapes can be translated in which mode: The following list shows which shapes can be translated in which mode:
* *STEP214Control_AsIs* - any OCCT shape * *STEP214Control_AsIs* - any OCCT shape
* *STEP214Control_ManifoldSolidBrep* - *TopoDS_Solid, TopoDS_Shell, TopoDS_Compound* (if it contains *TopoDS_Solids* and *TopoDS_Shells*. * *STEP214Control_ManifoldSolidBrep* - *TopoDS_Solid, TopoDS_Shell, TopoDS_Compound* (if it contains *TopoDS_Solids* and *TopoDS_Shells*.
* *STEP214Control_FacetedBrep* - *TopoDS_Solid* or *TopoDS_Compound* containing *TopoDS_Solids* if all its surfaces are *Geom_Planes* and all curves are *Geom_Lines*. * *STEP214Control_FacetedBrep* - *TopoDS_Solid* or *TopoDS_Compound* containing *TopoDS_Solids* if all its surfaces are *Geom_Planes* and all curves are *Geom_Lines*.
@ -963,98 +913,80 @@ A set of STEP entities describing general product information is written to the
The table below describes STEP entities, which are created when the assembly structure and product information are written to the STEP file, and shows how many of these entities are created. Note that the appearance of some of these entities depends on the version of the schema (AP214, CD, DIS or IS, or AP203). The table below describes STEP entities, which are created when the assembly structure and product information are written to the STEP file, and shows how many of these entities are created. Note that the appearance of some of these entities depends on the version of the schema (AP214, CD, DIS or IS, or AP203).
CASCADE shape STEP entity Comments | CASCADE shape | STEP entity | Comments |
application_protocol_definition One per STEP file, defines the application protocol used (depends on the schema version) | :--------- | :------ | :----- |
application_context One per STEP file, defines the application generating the file (AP214 or AP203) | | application_protocol_definition | One per STEP file, defines the application protocol used (depends on the schema version) |
TopoDS_Compound shape_representation Empty shape_representation describing the assembly. The components of that assembly are written as subtypes of shape_representation and are included to the assembly using next_assembly_usage_occurence entities. | | application_context | One per STEP file, defines the application generating the file (AP214 or AP203) |
TopoDS_Shape subtypes of shape_representation Depending on the shape type, see the tables below for mapping details | TopoDS_Compound | shape_representation | Empty *shape_representation* describing the assembly. The components of that assembly are written as subtypes of shape_representation and are included to the assembly using *next_assembly_usage_occurence* entities. |
next_assembly_usage_occurence Describes the instance of component in the assembly by referring corresponding product_definitions. If the same component is included in the assembly several times (for example, with different locations), several next_assembly_usage_occurences are created. | TopoDS_Shape | subtypes of shape_representation | Depending on the shape type, see the tables below for mapping details |
context_dependent_shape_representation Describes the placement of a component in the assembly. One context_dependent_shape_ representation corresponds to each next_assembly_usage_occurence entity. | | next_assembly_usage_occurence | Describes the instance of component in the assembly by referring corresponding *product_definitions*. If the same component is included in the assembly several times (for example, with different locations), several *next_assembly_usage_occurences* are created. |
shape_representation_relationship_with_transformation Together with the context_dependent_shape_ representation describes the location of a component in the assembly. | | context_dependent_shape_representation | Describes the placement of a component in the assembly. One *context_dependent_shape_representation* corresponds to each *next_assembly_usage_occurence* entity. |
item_defined_transformation Defines a transformation used for the location of a component in the assembly. Is referred by shape_representation_relationship_with_transformation | | shape_representation_relationship_with_transformation | Together with the *context_dependent_shape_representation* describes the location of a component in the assembly. |
shape_definition_representation One per shape_representation | | item_defined_transformation | Defines a transformation used for the location of a component in the assembly. Is referred by *shape_representation_relationship_with_transformation*. |
product_definition_shape One per shape_definition_representation and context_dependent_shape_representation | | shape_definition_representation | One per *shape_representation*. |
product_definition Defines a product, one per shape_definition_representation | | product_definition_shape | One per *shape_definition_representation* and *context_dependent_shape_representation* |
product_definition_formation One per product_definition. All product_definition_formations in the STEP file have unique names. | | product_definition | Defines a product, one per *shape_definition_representation* |
Product One per product_definition_formation. All products in the STEP file have unique names. | | product_definition_formation | One per *product_definition*. All *product_definition_formations* in the STEP file have unique names. |
product_type (CD) or product_related_product_category (DIS,IS) One per product | | Product | One per *product_definition_formation*. All products in the STEP file have unique names. |
Mechanical_context (CD) or product_context (DIS,IS) One per product. | | product_type (CD) or product_related_product_category (DIS,IS) | One per product |
product_definition_context One per product_definition. | | Mechanical_context (CD) or product_context (DIS,IS) | One per product. |
| | product_definition_context | One per *product_definition*. |
@subsubsection occt_step_3_4_2 Topological shapes @subsubsection occt_step_3_4_2 Topological shapes
CASCADE shape STEP entity Comments | CASCADE shape | STEP entity | Comments |
TopoDS_Compound geometric_curve_set If the write mode is STEP214Control_GeometricCurveSet only 3D curves of the edges found in TopoDS_Compound and all its subshapes are translated | :----- | :---- | :----- |
manifold_solid_brep If the write mode is STEP214Control_AsIs and TopoDS_Compound consists only of TopoDS_Solids | TopoDS_Compound | geometric_curve_set | If the write mode is *STEP214Control_GeometricCurveSet* only 3D curves of the edges found in *TopoDS_Compound* and all its subshapes are translated |
shell_based_surface_model If the write mode is STEP214Control_AsIs and TopoDS_Compound consists of TopoDS_Solids, TopoDS_Shells and TopoDS_Faces | | manifold_solid_brep | If the write mode is *STEP214Control_AsIs* and *TopoDS_Compound* consists only of *TopoDS_Solids*. |
geometric_curve_set If the write mode is STEP214Control_AsIs and TopoDS_Compound contains TopoDS_Wires, TopoDS_Edges, TopoDS_Vertices | | shell_based_surface_model | If the write mode is *STEP214Control_AsIs* and *TopoDS_Compound* consists of *TopoDS_Solids*, *TopoDS_Shells* and *TopoDS_Faces*.|
If the write mode is not STEP214Control_AsIs or STEP214Control_GeometricCurveSet TopoDS_Solids, TopoDS_Shells and TopoDS_Faces are translated according to this table. | | geometric_curve_set | If the write mode is *STEP214Control_AsIs* and *TopoDS_Compound* contains *TopoDS_Wires, TopoDS_Edges, TopoDS_Vertices*. If the write mode is not *STEP214Control_AsIs* or *STEP214Control_GeometricCurveSet*, *TopoDS_Solids, TopoDS_Shells* and *TopoDS_Faces* are translated according to this table. |
TopoDS_Solid manifold_solid_brep If the write mode is STEP214Control_AsIs or STEP214Control_ManifoldSolidBrep and CASCADE TopoDS_Solid has no voids. | TopoDS_Solid | manifold_solid_brep | If the write mode is *STEP214Control_AsIs* or *STEP214Control_ManifoldSolidBrep* and CASCADE *TopoDS_Solid* has no voids. |
faceted_brep If the write mode is STEP214Control_FacetedBrep. | | faceted_brep | If the write mode is *STEP214Control_FacetedBrep*. |
brep_with_voids If the write mode is STEP214Control_AsIs or STEP214Control_ManifoldSolidBrep and CASCADE TopoDS_Solid has voids. | | brep_with_voids | If the write mode is *STEP214Control_AsIs* or *STEP214Control_ManifoldSolidBrep* and CASCADE *TopoDS_Solid* has voids. |
shell_based_surface_model If the write mode is STEP214Control_ShellBasedSurfaceModel. | | shell_based_surface_model | If the write mode is *STEP214Control_ShellBasedSurfaceModel*. |
geometric_curve_set If the write mode is STEP214Control_GeometricCurveSet. Only 3D curves of the edges are translated. | | geometric_curve_set | If the write mode is *STEP214Control_GeometricCurveSet*. Only 3D curves of the edges are translated. |
TopoDS_Shell in a TopoDS_Solid closed_shell If TopoDS_Shell is closed shell. | TopoDS_Shell in a TopoDS_Solid | closed_shell | If *TopoDS_Shell* is closed shell. |
TopoDS_Shell manifold_solid_brep If the write mode is STEP214Control_ManifoldSolidBrep. | TopoDS_Shell | manifold_solid_brep | If the write mode is *STEP214Control_ManifoldSolidBrep*. |
shell_based_surface_model If the write mode is STEP214Control_AsIs or STEP214Control_ShellBasedSurfaceModel. | | shell_based_surface_model | If the write mode is *STEP214Control_AsIs* or *STEP214Control_ShellBasedSurfaceModel*. |
geometric_curve_set If the write mode is STEP214Control_GeometricCurveSet. Only 3D curves of the edges are translated. | | geometric_curve_set | If the write mode is *STEP214Control_GeometricCurveSet*. Only 3D curves of the edges are translated. |
TopoDS_Face advanced_face | TopoDS_Face | advanced_face | |
TopoDS_Wire in a TopoDS_Face face_bound The resulting face_bound contains poly_loop if write mode is faceted_brep or edge_loop if not . | TopoDS_Wire in a TopoDS_Face | face_bound | The resulting *face_bound* contains *poly_loop* if write mode is *faceted_brep* or *edge_loop* if it is not. |
TopoDS_Wire geometric_curve_set If the write mode is STEP214Control_GeometricCurveSet. Only 3D curves of the edges are translated. | TopoDS_Wire | geometric_curve_set | If the write mode is *STEP214Control_GeometricCurveSet*. Only 3D curves of the edges are translated. |
TopoDS_Edge oriented_edge | TopoDS_Edge | oriented_edge | |
TopoDS_Vertex vertex_point | TopoDS_Vertex | vertex_point | |
@subsubsection occt_step_3_4_3 Geometrical objects @subsubsection occt_step_3_4_3 Geometrical objects
CASCADE object STEP entity Comments | Geometry | CASCADE object | STEP entity | Comments |
Points | :----- | :------ | :----- | :----- |
Geom_CartesianPoint cartesian_point | Points | Geom_CartesianPoint, Geom2d_CartesianPoint | cartesian_point | |
Geom2d_CartesianPoint | | TColgp_Array1OfPnt, TColgp_Array1OfPnt2d | polyline | |
TColgp_Array1OfPnt polyline | Placements | Geom_Axis1Plasement, Geom2d_AxisPlacement | axis1_placement | |
TColgp_Array1OfPnt2d | | Geom_Axis2Placement | axis2_placement_3d | |
Placements | Directions | Geom_Direction, Geom2d_Direction | direction | |
Geom_Axis1Plasement axis1_placement | Vectors | Geom_Vector, Geom2d_Vector | vector | |
Geom2d_AxisPlacement | Curves | Geom_Circle | circle | |
Geom_Axis2Placement axis2_placement_3d | | Geom2d_Circle | circle, rational_b_spline_curve | |
Directions | | Geom_Ellipse | Ellipse | |
Geom_Direction direction | | Geom2d_Ellipse | Ellipse, rational_b_spline_curve | |
Geom2d_Direction | | Geom_Hyperbola, Geom2d_Hyperbola | Hyperbola | |
Vectors | | Geom_Parabola, Geom2d_Parabola | Parabola | |
Geom_Vector vector | | Geom_BSplineCurve | b_spline_curve_with_knots or rational_b_spline_curve | *rational_b_spline_curve* is produced if *Geom_BsplineCurve* is a rational BSpline |
Geom2d_Vector | | Geom2d_BSplineCurve | b_spline_curve_with_knots or rational_b_spline_curve | *rational_b_spline_curve* is produced if *Geom2d_BsplineCurve* is a rational BSpline |
Curves | | Geom_BezierCurve | b_spline_curve_with_knots | |
Geom_Circle circle | | Geom_Line or Geom2d_Line | Line | |
Geom2d_Circle circle | Surfaces | Geom_Plane | Plane | |
rational_b_spline_curve | | Geom_OffsetSurface | offset_surface | |
Geom_Ellipse Ellipse | | Geom_ConicalSurface | conical_surface | |
Geom2d_Ellipse Ellipse | | Geom_CylindricalSurface | cylindrical_surface | |
rational_b_spline_curve | | Geom_OffsetSurface | offset_surface | |
Geom_Hyperbola Hyperbola | | Geom_RectangularTrimmedSurface | rectangular_trimmed_surface | |
Geom2d_Hyperbola | | Geom_SphericalSurface | spherical_surface | |
Geom_Parabola Parabola | | Geom_SurfaceOfLinear Extrusion | surface_of_linear_extrusion | |
Geom2d_Parabola | | Geom_SurfaceOf Revolution | surface_of_revolution | |
Geom_BSplineCurve b_spline_curve_with_knots | | Geom_ToroidalSurface | toroidal_surface or degenerate_toroidal_surface | *degenerate_toroidal_surface* is produced if the minor radius is greater then the major one |
rational_b_spline_curve if Geom_BsplineCurve is a rational BSpline | | Geom_BezierSurface | b_spline_surface_with_knots | |
Geom2d_BSplineCurve b_spline_curve_with_knots | | Geom_BsplineSurface | b_spline_surface_with_knots or rational_b_spline_surface | *rational_b_spline_surface* is produced if *Geom_BSplineSurface* is a rational Bspline |
b_spline_curve_with_knots_ and_rational_b_spline_curve if Geom2d_BSplineCurve is a rational Bspline
Geom_BezierCurve b_spline_curve_with_knots
Geom_Line Line
Geom2d_Line
Surfaces
Geom_Plane Plane
Geom_OffsetSurface offset_surface
Geom_ConicalSurface conical_surface
Geom_CylindricalSurface cylindrical_surface
Geom_OffsetSurface offset_surface
Geom_RectangularTrimmedSurface rectangular_trimmed_surface
Geom_SphericalSurface spherical_surface
Geom_SurfaceOfLinear Extrusion surface_of_linear_extrusion
Geom_SurfaceOf Revolution surface_of_revolution
Geom_ToroidalSurface toroidal_surface
degenerate_toroidal_surface if the minor radius is greater then the major one
Geom_BezierSurface b_spline_surface_with_knots
Geom_BsplineSurface b_spline_surface_with_knots
b_spline_surface_with_knots_ and_rational_b_spline_surface if Geom_BSplineSurface is a rational Bspline
@subsection occt_step_3_5 Tolerance management @subsection occt_step_3_5 Tolerance management
@ -1211,16 +1143,13 @@ For a description of parameters used in reading a STEP file refer to <a href="#o
For reading a STEP file, the following parameters are defined (see above, <a href="#occt_step_6_2">the command *param*</a>): For reading a STEP file, the following parameters are defined (see above, <a href="#occt_step_6_2">the command *param*</a>):
Description Name Values Meaning | Description | Name | Values | Meaning |
Precision for input entities read.precision.mode 0 or 1 If 0 (File), precision of the input STEP file will be used for the loaded shapes | :------------ | :---- | :------- | :------- |
If 1 (Session), the following parameter will be used as the precision value | Precision for input entities | read.precision.mode | 0 or 1 | If 0 (File), precision of the input STEP file will be used for the loaded shapes; If 1 (Session), the following parameter will be used as the precision value. |
read.precision.val real Value of precision (used if the previous parameter is 1) | | read.precision.val | real | Value of precision (used if the previous parameter is 1) |
Surface curves read.surfacecurve.mode 0 or 3 Defines a preferable way of representing surface curves (2d or 3d representation). | Surface curves | read.surfacecurve.mode | 0 or 3 | Defines a preferable way of representing surface curves (2d or 3d representation). If 0, no preference. |
If 0, no preference. | Maximal tolerance | read.maxprecision.mode | 0 or 1 | If 1, maximum tolerance is used as a rigid limit If 0, maximum tolerance is used as a limit but can be exceeded by some algorithms. |
Maximal tolerance read.maxprecision.mode 0 or 1 If 1, maximum tolerance is used as a rigid limit | | read.maxprecision.val | real | Value of maximum precision |
If 0, maximum tolerance is used as a limit but can be exceeded by some algorithms
read.maxprecision.val real Value of maximum precision
It is possible either only to load a STEP file into memory (i.e. fill the *InterfaceModel* with data from the file), or to read it (i.e. load and convert all entities to OCCT shapes). It is possible either only to load a STEP file into memory (i.e. fill the *InterfaceModel* with data from the file), or to read it (i.e. load and convert all entities to OCCT shapes).
Loading is done by the command Loading is done by the command
@ -1235,12 +1164,13 @@ Draw:> stepread <file_name> <result_shape_name> [selection]
Here a dot can be used instead of a filename if the file is already loaded by xload or stepread. Here a dot can be used instead of a filename if the file is already loaded by xload or stepread.
The optional selection (see below for a description of selections) specifies a set of entities to be translated. If an asterisk `*' is given, all transferable roots are translated. If a selection is not given, the user is prompted to define a scope of transfer interactively: The optional selection (see below for a description of selections) specifies a set of entities to be translated. If an asterisk `*' is given, all transferable roots are translated. If a selection is not given, the user is prompted to define a scope of transfer interactively:
N Mode Description | N | Mode | Description |
0 End Finish transfer and exit stepread | :---- | :---- | :---- |
1 root with rank 1 Transfer first root | 0 | End | Finish transfer and exit stepread |
2 root by its rank Transfer root specified by its rank | 1 | root with rank 1 | Transfer first root |
3 One entity Transfer entity with a number provided by the user | 2 | root by its rank | Transfer root specified by its rank |
4 Selection Transfer only entities contained in selection | 3 | One entity | Transfer entity with a number provided by the user |
| 4 | Selection | Transfer only entities contained in selection |
* root is an entity in the STEP file which is not referenced by another entities * root is an entity in the STEP file which is not referenced by another entities
Second parameter of the stepread command defines the name of the loaded shape. Second parameter of the stepread command defines the name of the loaded shape.
@ -1356,20 +1286,18 @@ When specifying min and max arguments this command saves shapes with tolerances
@subsection occt_step_6_5 Writing a STEP file @subsection occt_step_6_5 Writing a STEP file
For writing shapes to a STEP file, the following parameters are defined (see above, <a href="#occt_step_6_2">the command *param*</a>): For writing shapes to a STEP file, the following parameters are defined (see above, <a href="#occt_step_6_2">the command *param*</a>):
| Description | Name | Values | Meaning |
Description Name Values Meaning | :------------ | :----- | :------ | :------- |
Uncertainty for resulting entities Write.precision.mode -1, 0, 1 or 2 If -1 the uncertainty value is set to the minimal tolerance of CASCADE subshapes. | Uncertainty for resulting entities | Write.precision.mode | -1, 0, 1 or 2 | If -1 the uncertainty value is set to the minimal tolerance of CASCADE subshapes. If 0 the uncertainty value is set to the average tolerance of CASCADE subshapes. If 1 the uncertainty value is set to the maximal tolerance of CASCADE subshapes. If 2 the uncertainty value is set to write.precision.val |
If 0 the uncertainty value is set to the average tolerance of CASCADE subshapes. | Value of uncertainty | Write.precision.val | real | Value of uncertainty (used if previous parameter is 2). |
If 1 the uncertainty value is set to the maximal tolerance of CASCADE subshapes.
If 2 the uncertainty value is set to write.precision.val
Value of uncertainty Write.precision.val real Value of uncertainty (used if previous parameter is 2)
Several shapes can be written in one file. To start writing a new file, enter command *Draw:> newmodel*. Several shapes can be written in one file. To start writing a new file, enter command *Draw:> newmodel*.
Actually, command *newmodel* will clear the *InterfaceModel* to empty it, and the next command will convert the specified shape to STEP entities and add them to the *InterfaceModel*: Actually, command *newmodel* will clear the *InterfaceModel* to empty it, and the next command will convert the specified shape to STEP entities and add them to the *InterfaceModel*:
~~~~~ ~~~~~
Draw:> stepwrite <mode> \<shape_name\> [<file_name>] Draw:> stepwrite <mode> \<shape_name\> [<file_name>]
~~~~~ ~~~~~
The available modes are following: The available modes are following:
* *a* - as is; * *a* - as is;
* *m* - manifold_solid_brep or brep_with_voids * *m* - manifold_solid_brep or brep_with_voids