0024855: Revision of parameters of standard materials

Improve consistency and visual appearance of predefined OCCT materials in various rendering modes, including ray-tracing:
- Increase the specular exponents (shininesses) for metallic surfaces: Brass, Bronze, Copper, Gold, Pewter, Silver, Steel, Chrome, Aluminum.
- Revise specular colors for metals: Copper, Gold, Aluminum, Silver (according to "Real-Time Rendering, 3rd Edition", AK Peters 2008).
- Increase diffuse reflection of metals: Silver, Aluminum, Chrome (to make them brighter in OpenGL mode).
- Extend Material definition by Refraction Index.
  Advanced rendering methods based on shaders or ray-tracing can utilize it to produce refraction effects.

In addition:
- Introduce three translucent materials: Water, Glass, and Diamond.
- Add Charcoal for modeling dark diffuse surfaces.

Add new TCL-based sample (materials.tcl) and test case (tests/v3d/materials/bug24855).

samples/tcl/materials.tcl

@@ -0,0 +1,87 @@
+# Script displays properties of different materials available in OCCT
+
+set THE_MATERIALS {brass bronze copper gold jade neon_phc pewter obsidian plaster plastic satin silver steel stone chrome aluminium water glass diamond charcoal}
+set THE_COLORS    {default red green blue1}
+set THE_ROW_DIST  35
+
+proc drawLabels {} {
+  set x 20
+  set y 15
+  set r 25
+  set g 25
+  set b 25
+  foreach aMatIter $::THE_MATERIALS {
+    vdrawtext "$aMatIter" $x $y 0 $r $g $b 2 1 000 0 14 1 Arial
+    incr y 10
+  }
+  set x 40
+  set y  5
+  foreach aColIter $::THE_COLORS {
+    if { $aColIter == "red" } {
+      set r 255
+      set g 0
+      set b 0
+    } elseif { $aColIter == "green" } {
+      set r 0
+      set g 255
+      set b 0
+    } elseif { $aColIter == "blue1" } {
+      set r 0
+      set g 0
+      set b 255
+    }
+    vdrawtext "$aColIter" $x $y 0 $r $g $b 1 1 000 0 14 1 Arial
+    incr x $::THE_ROW_DIST
+  }
+}
+
+proc drawObjects {theRow theColor} {
+  set aSize    4
+  set aCtr    -2
+  set aCounter 0
+  set x [expr 30 + $theRow * $::THE_ROW_DIST]
+  set y 15
+  foreach aMatIter $::THE_MATERIALS {
+    set aSph s${theRow}_${aCounter}
+    set aBox b${theRow}_${aCounter}
+    uplevel #0 psphere $aSph $aSize
+    uplevel #0 box     $aBox $aCtr $aCtr $aCtr $aSize $aSize $aSize
+    uplevel #0 ttranslate   $aSph $x $y 0
+    uplevel #0 ttranslate   $aBox [expr $x + 10] $y 0
+    uplevel #0 vdisplay     -noredraw $aSph $aBox
+    uplevel #0 vsetmaterial -noredraw $aSph $aBox $aMatIter
+    if {$theColor != ""} {
+      uplevel #0 vsetcolor  -noredraw $aSph $aBox $theColor
+    }
+    incr aCounter
+    incr y 10
+  }
+}
+
+# setup 3D viewer content
+pload MODELING VISUALIZATION
+
+catch { vclose View1 }
+vinit View1 w=768 h=768
+vclear
+vtop
+vglinfo
+vsetgradientbg 180 200 255 180 180 180 2
+vlight change 0 pos -1 1 1
+vsetdispmode 1
+
+# adjust scene bounding box
+box bnd 0 0 0 180 210 1
+vdisplay -noredraw bnd
+vsetdispmode       bnd 0
+vfit
+vremove -noredraw  bnd
+
+# draw spheres and boxes with different materials
+drawLabels
+drawObjects 0 ""
+drawObjects 1 red
+drawObjects 2 green
+drawObjects 3 blue1
+#vfit
+vzfit

src/Graphic3d/Graphic3d.cdl

@@ -115,32 +115,39 @@ is
 
         enumeration NameOfMaterial is
                     NOM_BRASS,      -- laiton       (PHYSIC)
-                                        NOM_BRONZE,     -- bronze       (PHYSIC)
+                    NOM_BRONZE,     -- bronze       (PHYSIC)
-                                        NOM_COPPER,     -- cuivre       (PHYSIC)
+                    NOM_COPPER,     -- cuivre       (PHYSIC)
-                                        NOM_GOLD,       -- or           (PHYSIC)
+                    NOM_GOLD,       -- or           (PHYSIC)
 
-                                        NOM_PEWTER,     -- etain        (PHYSIC)
+                    NOM_PEWTER,     -- etain        (PHYSIC)
 
-                                        NOM_PLASTER,    -- platre       (GENERIC)
+                    NOM_PLASTER,    -- platre       (GENERIC)
-                                        NOM_PLASTIC,    -- plastic      (GENERIC)
+                    NOM_PLASTIC,    -- plastic      (GENERIC)
 
-                                        NOM_SILVER,     -- argent       (PHYSIC)
+                    NOM_SILVER,     -- argent       (PHYSIC)
 
-                                        NOM_STEEL,      -- acier        (PHYSIC)
+                    NOM_STEEL,      -- acier        (PHYSIC)
 
-                                        NOM_STONE,      -- pierre       (PHYSIC)
+                    NOM_STONE,      -- pierre       (PHYSIC)
 
-                                        NOM_SHINY_PLASTIC,      -- plastique brillant   (GENERIC)
+                    NOM_SHINY_PLASTIC,   -- plastique brillant   (GENERIC)
-                                        NOM_SATIN,      --  satin       (GENERIC)
+                    NOM_SATIN,           --  satin        (GENERIC)
-                                        NOM_METALIZED,  -- metallise New (GENERIC)
+                    NOM_METALIZED,       -- metallise New (GENERIC)
-                                        NOM_NEON_GNC,   -- neon      New (GENERIC)
+                    NOM_NEON_GNC,        -- neon      New (GENERIC)
-                                        NOM_CHROME,     -- chrome    New (PHYSIC)
+                    NOM_CHROME,          -- chrome    New (PHYSIC)
-                                        NOM_ALUMINIUM,  -- aluminium New (PHYSIC)
+                    NOM_ALUMINIUM,       -- aluminium New (PHYSIC)
-                                        NOM_OBSIDIAN,   -- obsidian  New (PHYSIC)
+                    NOM_OBSIDIAN,        -- obsidian  New (PHYSIC)
-                                        NOM_NEON_PHC,   -- neon      New (PHYSIC)
+                    NOM_NEON_PHC,        -- neon      New (PHYSIC)
-                                        NOM_JADE,       -- jade      New (PHYSIC)
+                    NOM_JADE,            -- jade      New (PHYSIC)
-                        NOM_DEFAULT,
+
-                        NOM_UserDefined -- owner material
+                    NOM_CHARCOAL,
+
+                    NOM_WATER,
+                    NOM_GLASS,
+                    NOM_DIAMOND,
+
+                    NOM_DEFAULT,
+                    NOM_UserDefined -- owner material
     end NameOfMaterial;
     ---Purpose: Types of aspect materials.
     ---Category: Enumerations

src/Graphic3d/Graphic3d_MaterialAspect.cdl

@@ -143,6 +143,15 @@ is
 	--	    negative value or greater than 1.0.
 	raises MaterialDefinitionError from Graphic3d is static;
 
+	SetRefractionIndex ( me	: in out;
+		      theValue	: Real from Standard )
+	---Level: Public
+	---Purpose: Modifies the refraction index of the material.
+	--  Category: Methods to modify the class definition
+	--  Warning: Raises MaterialDefinitionError if <theValue> is a
+	--	    lesser than 1.0.
+	raises MaterialDefinitionError from Graphic3d is static;
+
 	SetColor ( me		: in out;
 		   AColor	: Color from Quantity )
 		is static;
@@ -313,7 +322,14 @@ is
 	---Purpose: Returns the transparency coefficient of the surface.
 	---Category: Inquire methods
 
-        Emissive ( me )
+	RefractionIndex ( me )
+		returns Real from Standard
+		is static;
+	---Level: Public
+	---Purpose: Returns the refraction index of the material
+	---Category: Inquire methods
+
+  Emissive ( me )
 		returns Real from Standard
 		is static;
 	---Level: Public
@@ -409,7 +425,7 @@ is
 
         Init ( me : out; AName  : NameOfMaterial from Graphic3d) is private;
 
---
+--
 
 fields
 
@@ -449,47 +465,44 @@ fields
 --			Iris Advanced Graphics, unit D
 --
 --
-	-- the coefficient of diffuse reflection, the colour, and the activity
+  -- the coefficient of diffuse reflection, the colour, and the activity
-	MyDiffuseCoef		:	ShortReal from Standard;
+  myDiffuseCoef     : ShortReal from Standard;
-	MyDiffuseColor		:	Color from Quantity;
+  myDiffuseColor    : Color     from Quantity;
-	MyDiffuseActivity	:	Boolean from Standard;
+  myDiffuseActivity : Boolean   from Standard;
 
-	-- the coefficient of ambient reflection, the colour
+  -- the coefficient of ambient reflection, the colour and the activity
-	-- and the activity
+  myAmbientCoef     : ShortReal from Standard;
-	MyAmbientCoef		:	ShortReal from Standard;
+  myAmbientColor    : Color     from Quantity;
-	MyAmbientColor		:	Color from Quantity;
+  myAmbientActivity : Boolean   from Standard;
-	MyAmbientActivity	:	Boolean from Standard;
 
-	-- the coefficient of specular reflection, the colour
+  -- the coefficient of specular reflection, the colour and the activity
-	-- and the activity
+  mySpecularCoef     : ShortReal from Standard;
-	MySpecularCoef		:	ShortReal from Standard;
+  mySpecularColor    : Color from Quantity;
-	MySpecularColor		:	Color from Quantity;
+  mySpecularActivity : Boolean from Standard;
-	MySpecularActivity	:	Boolean from Standard;
 
-	-- the coefficient of emissive reflection
+  -- the coefficient of emissive reflection
-	MyEmissiveCoef          :       ShortReal from Standard;
+  myEmissiveCoef     : ShortReal from Standard;
-	MyEmissiveColor         :       Color from Quantity;
+  myEmissiveColor    : Color     from Quantity;
-	MyEmissiveActivity      :       Boolean from Standard;
+  myEmissiveActivity : Boolean   from Standard;
 
-	-- the coefficient of transparency
+  -- the coefficient of transparency and refraction index
-	MyTransparencyCoef	:	ShortReal from Standard;
+  myTransparencyCoef  : ShortReal from Standard;
+  myRefractionIndex   : ShortReal from Standard;
 
-	-- the coefficient of luminosity
+  -- the specular exponent
-	MyShininess		:	ShortReal from Standard;
+  myShininess    : ShortReal from Standard;
 
+  -- the coeficient of reflexion for the environment texture
+  myEnvReflexion : ShortReal from Standard;
 
-    	-- the coeficient of reflexion for the environment texture
+  -- the type of material
-    	MyEnvReflexion          :       ShortReal  from  Standard;
+  myMaterialType : TypeOfMaterial from Graphic3d;
 
-	-- the type of material
+  -- the Name of material
-	--MyMaterialType          :       Boolean from Standard;
+  myMaterialName          : NameOfMaterial from Graphic3d;
-	MyMaterialType          :       TypeOfMaterial from Graphic3d;
+  myRequestedMaterialName : NameOfMaterial from Graphic3d;
 
-        -- the Name of material
+  -- the string name of the material
-        MyMaterialName          : NameOfMaterial from Graphic3d;
+  myStringName : AsciiString from TCollection;
-        MyRequestedMaterialName : NameOfMaterial from Graphic3d;
-
-	-- the string name of the material
-	MyStringName		: AsciiString from TCollection;
 
 end MaterialAspect;

src/Graphic3d/Graphic3d_Structure.cxx

@@ -1034,12 +1034,13 @@ void Graphic3d_Structure::SetPrimitivesAspect (const Handle(Graphic3d_AspectFill
   // Back Material
   const Graphic3d_MaterialAspect& aBack = theAspFill->BackMaterial();
   // Light specificity
-  myCStructure->ContextFillArea.Back.Shininess    = float (aBack.Shininess());
+  myCStructure->ContextFillArea.Back.Shininess       = float (aBack.Shininess());
-  myCStructure->ContextFillArea.Back.Ambient      = float (aBack.Ambient());
+  myCStructure->ContextFillArea.Back.Ambient         = float (aBack.Ambient());
-  myCStructure->ContextFillArea.Back.Diffuse      = float (aBack.Diffuse());
+  myCStructure->ContextFillArea.Back.Diffuse         = float (aBack.Diffuse());
-  myCStructure->ContextFillArea.Back.Specular     = float (aBack.Specular());
+  myCStructure->ContextFillArea.Back.Specular        = float (aBack.Specular());
-  myCStructure->ContextFillArea.Back.Transparency = float (aBack.Transparency());
+  myCStructure->ContextFillArea.Back.Transparency    = float (aBack.Transparency());
-  myCStructure->ContextFillArea.Back.Emission     = float (aBack.Emissive());
+  myCStructure->ContextFillArea.Back.RefractionIndex = float (aBack.RefractionIndex());
+  myCStructure->ContextFillArea.Back.Emission        = float (aBack.Emissive());
 
   // Reflection mode
   myCStructure->ContextFillArea.Back.IsAmbient    = (aBack.ReflectionMode (Graphic3d_TOR_AMBIENT)  ? 1 : 0);
@@ -1077,12 +1078,13 @@ void Graphic3d_Structure::SetPrimitivesAspect (const Handle(Graphic3d_AspectFill
   // Front Material
   const Graphic3d_MaterialAspect& aFront = theAspFill->FrontMaterial();
   // Light specificity
-  myCStructure->ContextFillArea.Front.Shininess    = float (aFront.Shininess());
+  myCStructure->ContextFillArea.Front.Shininess       = float (aFront.Shininess());
-  myCStructure->ContextFillArea.Front.Ambient      = float (aFront.Ambient());
+  myCStructure->ContextFillArea.Front.Ambient         = float (aFront.Ambient());
-  myCStructure->ContextFillArea.Front.Diffuse      = float (aFront.Diffuse());
+  myCStructure->ContextFillArea.Front.Diffuse         = float (aFront.Diffuse());
-  myCStructure->ContextFillArea.Front.Specular     = float (aFront.Specular());
+  myCStructure->ContextFillArea.Front.Specular        = float (aFront.Specular());
-  myCStructure->ContextFillArea.Front.Transparency = float (aFront.Transparency());
+  myCStructure->ContextFillArea.Front.Transparency    = float (aFront.Transparency());
-  myCStructure->ContextFillArea.Front.Emission     = float (aFront.Emissive());
+  myCStructure->ContextFillArea.Front.RefractionIndex = float (aFront.RefractionIndex());
+  myCStructure->ContextFillArea.Front.Emission        = float (aFront.Emissive());
 
   // Reflection mode
   myCStructure->ContextFillArea.Front.IsAmbient    = (aFront.ReflectionMode (Graphic3d_TOR_AMBIENT)  ? 1 : 0);

src/InterfaceGraphic/InterfaceGraphic_Graphic3d.hxx

@@ -62,8 +62,9 @@ typedef struct {
         float Emission;
         int IsEmission;
 
-        float Transparency;
         float Shininess;
+        float Transparency;
+        float RefractionIndex;
 
         float EnvReflexion;
 

src/OpenGl/OpenGl_AspectFace.cxx

@@ -33,7 +33,7 @@ namespace
   static OPENGL_SURF_PROP THE_DEFAULT_MATERIAL =
   {
     0.2F,  0.8F, 0.1F, 0.0F, // amb, diff, spec, emsv
-    1.0F, 10.0F, 0.0F,       // trans, shine, env_reflexion
+    1.0F, 10.0F, 1.0F, 0.0F, // trans, shine, index, env_reflexion
     0, // isphysic
     (OPENGL_AMBIENT_MASK | OPENGL_DIFFUSE_MASK | OPENGL_SPECULAR_MASK), // color_mask
     {{ 1.0F, 1.0F, 1.0F, 1.0F }}, // ambient color
@@ -110,6 +110,7 @@ void OpenGl_AspectFace::convertMaterial (const CALL_DEF_MATERIAL& theMat,
   // trans = 1. => transparent
   // in OpenGl it is opposite.
   theSurf.trans = 1.0f - theMat.Transparency;
+  theSurf.index = theMat.RefractionIndex;
 }
 
 // =======================================================================

src/OpenGl/OpenGl_AspectFace.hxx

@@ -42,7 +42,7 @@ static const TEL_POFFSET_PARAM THE_DEFAULT_POFFSET = { Aspect_POM_Fill, 1.0F, 0.
 struct OPENGL_SURF_PROP
 {
   float        amb, diff, spec, emsv;
-  float        trans, shine;
+  float        trans, shine, index;
   float        env_reflexion;
   int          isphysic;
   unsigned int color_mask;

tests/bugs/demo/bug23410

@@ -16,7 +16,7 @@ vsetdispmode 1
 vfit
 vsetcolor result GREEN
 
-checkcolor $x_coord $y_coord 0.45 0.95 0.05
+checkcolor $x_coord $y_coord 0.00 0.83 0.00
 
 set 3dviewer 1
 

tests/bugs/vis/bug22879

@@ -22,14 +22,14 @@ vdisplay b
 vsetdispmode 1
 vsetcolor b ANTIQUEWHITE
 
-checkcolor 24 55 0.75686198472976685 0 0
+checkcolor 24 55  0.753 0.000 0.000
-checkcolor 16 76 0 0 0.50195999999999996
+checkcolor 16 76  0.000 0.000 1.000
-checkcolor 26 107 0.18039199709892273 0.5686269998550415 0.180392
+checkcolor 25 107 0.000 1.000 0.000
-checkcolor 34 114 0.29803898930549622 0.29803898930549622 0.298039
+checkcolor 34 114 0.298 0.298 0.298
-checkcolor 24 131 0.61960697174072266 0 0
+checkcolor 24 131 0.922 0.000 0.000
-checkcolor 18 139 0.21568599343299866 0 0.78431300000000004
+checkcolor 18 139 0.145 0.000 0.855
-checkcolor 56 160 1 0 0
+checkcolor 56 160 1.000 0.000 0.000
-checkcolor 30 160 0 1 0.90980300000000003
+checkcolor 30 160 0.188 0.761 0.698
 
 set only_screen 1
 

tests/bugs/vis/bug22912

@@ -23,8 +23,8 @@ vsetcolor p_2 green
 vsettransparency p_1 0.5
 vsettransparency p_1 0
 
-checkcolor 120 150 1 0.3 0.06
+checkcolor 120 150 0.831 0.000 0.000
-checkcolor 180 273 0.39 1 0.058
+checkcolor 180 273 0.000 0.753 0.000
 
 set only_screen 1
 

tests/bugs/vis/bug24762_coloredshape

@@ -43,6 +43,6 @@ if {"$aWireColor"  != "HOTPINK"} {
 if {"$anEdgeColor" != "RED"} {
   puts "Error: wrong Edge color"
 }
-if {"$aFaceColor"  != "LEMONCHIFFON1"} {
+if {"$aFaceColor"  != "GRAY62"} {
   puts "Error: wrong Face color"
 }

tests/bugs/vis/bug5990

@@ -15,13 +15,13 @@ set y2 269
 set x3 348
 set y3 238
 
-set KUB_R 0.45098000764846802
+set KUB_R 0.00
-set KUB_G 0.32941100001335144
+set KUB_G 0.00
-set KUB_B 1
+set KUB_B 0.83
 
-set LINE_R 0
+set LINE_R 0.00
-set LINE_G 0
+set LINE_G 0.00
-set LINE_B 1
+set LINE_B 1.00
 
 
 box b1 10 10 10

tests/v3d/grids.list

@@ -12,3 +12,4 @@
 012 voxel
 013 glsl
 014 raytrace
+015 materials

tests/v3d/materials/bug24855

@@ -0,0 +1,43 @@
+puts "========"
+puts "OCC24855: Revision of parameters of standard materials"
+puts "========"
+
+# custom shapes
+set aShape [locate_data_file occ/Top.brep]
+
+# setup 3D viewer content
+vinit View1 w=768 h=768
+vglinfo
+
+vsetgradientbg 180 200 255 180 180 180 2
+
+# display shape
+vlight change 0 pos -1 1 1
+restore $aShape s
+vsetdispmode 1
+vdisplay s
+vfit
+
+proc testmat {dirname filename} {
+  foreach {aMatIter} {brass bronze copper gold jade neon_phc pewter obsidian plaster plastic satin silver steel stone chrome aluminium charcoal} {
+    vsetmaterial -noredraw s $aMatIter
+    vdump $dirname/${filename}_${aMatIter}.png
+  }
+}
+
+# make material screenshots
+testmat $imagedir $casename
+
+vshaderprog s phong
+testmat $imagedir ${casename}_phong
+
+vraytrace 1
+vtextureenv on 5
+vsetraytracemode aa=1 refl=1
+
+testmat $imagedir ${casename}_rt
+
+vclear
+vraytrace 0
+vtextureenv off
+source $env(CASROOT)/samples/tcl/materials.tcl