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0029734: Modeling Algorithms - Compute global properties of tessellated shape

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New algorithms calculating global properties on mesh data have been added:
- BRepGProp_MeshCinert computes the global properties of polylines represented by a set of points;
- BRepGProp_MeshProps computes the global properties of a surface mesh.

Existing tool BRepGProp now automatically uses new algorithm for triangulation-only faces.
By default, algorithm will use exact geometry objects (surfaces), when it is available (as before the patch);
this behavior can be switched by a new flag UseTriangulation, forcing usage of triangulation instead of exact geometry when both defined.
This commit is contained in:
ifv
2018-05-17 15:38:17 +03:00
committed by kgv
parent a820bd4f13
commit 4b114473ef
15 changed files with 1090 additions and 105 deletions
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dox/user_guides/draw_test_harness/draw_test_harness.md
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@@ -7209,15 +7209,26 @@ Analysis of shapes includes commands to compute length, area, volumes and inerti
Syntax:
~~~~~
lprops shape
sprops shape
vprops shape
lprops shape [x y z] [-skip] [-full] [-tri]
sprops shape [epsilon] [c[losed]] [x y z] [-skip] [-full] [-tri]
vprops shape [epsilon] [c[losed]] [x y z] [-skip] [-full] [-tri]
~~~~~
* **lprops** computes the mass properties of all edges in the shape with a linear density of 1;
* **sprops** of all faces with a surface density of 1;
* **vprops** of all solids with a density of 1.
For computation of properties of the shape, exact geomery (curves, surfaces) or
some discrete data (polygons, triangulations) can be used for calculations.
The epsilon, if given, defines relative precision of computation.
The **closed** flag, if present, forces computation only closed shells of the shape.
The centroid coordinates will be put to DRAW variables x y z (if given).
Shared entities will be taken in account only one time in the **skip** mode.
All values are output with the full precision in the **full** mode.
Preferable source of geometry data are triangulations in case if it exists,
if the **-tri** key is used, otherwise preferable data is exact geometry.
If epsilon is given, exact geometry (curves, surfaces) are used for calculations independently of using key **-tri**.
All three commands print the mass, the coordinates of the center of gravity, the matrix of inertia and the moments. Mass is either the length, the area or the volume. The center and the main axis of inertia are displayed.
**Example:**