+ extend Inventor builder to support material nodes

src/Base/Builder3D.cpp

@@ -393,6 +393,27 @@ void InventorBuilder::addMaterial(float color_r,float color_g,float color_b)
     result << Base::blanks(indent) << "} " << std::endl;
 }
 
+void InventorBuilder::beginMaterial()
+{
+    result << Base::blanks(indent) << "Material { " << std::endl;
+    indent +=2;
+    result << Base::blanks(indent) << "diffuseColor [" << std::endl;
+    indent +=2;
+}
+
+void InventorBuilder::endMaterial()
+{
+    indent -=2;
+    result << Base::blanks(indent) << "]" << std::endl;
+    indent -=2;
+    result << Base::blanks(indent) << "}" << std::endl;
+}
+
+void InventorBuilder::addColor(float color_r,float color_g,float color_b)
+{
+    result << color_r << " " << color_g << " " << color_b << std::endl;
+}
+
 void InventorBuilder::addMaterialBinding(const char* bind)
 {
     result << Base::blanks(indent) << "MaterialBinding { value "

src/Base/Builder3D.h

@@ -175,6 +175,8 @@ public:
      * \param str - text set to the label node
      */
     void addLabel(const char* str);
+    /** @name Appearance handling */
+    //@{
     /*!
      * \brief Sets a base color node. The colors are in the range [0, 1].
      * \param color_r - red color
@@ -189,6 +191,22 @@ public:
      * \param color_b - blue color
      */
     void addMaterial(float color_r,float color_g,float color_b);
+    /*!
+     * \brief Starts a material node. The node must be closed with \ref endMaterial
+     * and the colors must be added with \ref addColor().
+     */
+    void beginMaterial();
+    /*!
+     * \brief Closes a material node.
+     */
+    void endMaterial();
+    /*!
+     * \brief Adds a color to a material node. The colors are in the range [0, 1].
+     * \param color_r - red color
+     * \param color_g - green color
+     * \param color_b - blue color
+     */
+    void addColor(float color_r,float color_g,float color_b);
     /*!
      * \brief Sets a material binding node.
      * \param binding - binding of the material. Allowed values are:
@@ -210,6 +228,7 @@ public:
      * \param crease - the crease angle in radians
      */
     void addShapeHints(float crease=0.0f);
+    //@}
 
     /** @name Add coordinates */
     //@{