Base: [skip ci] support of spheres in InventorBuilder

src/Base/Builder3D.cpp

@@ -856,6 +856,13 @@ void InventorBuilder::addCylinder(float radius, float height)
            << Base::blanks(indent) << "}\n";
 }
 
+void InventorBuilder::addSphere(float radius)
+{
+    result << Base::blanks(indent) << "Sphere {\n"
+           << Base::blanks(indent) << "  radius " << radius << "\n"
+           << Base::blanks(indent) << "}\n";
+}
+
 void InventorBuilder::addBoundingBox(const Vector3f& pt1, const Vector3f& pt2, short lineWidth,
                                      float color_r,float color_g,float color_b)
 {

src/Base/Builder3D.h

@@ -301,6 +301,7 @@ public:
         int numUControlPoints, int numVControlPoints,
         const std::vector<float>& uKnots, const std::vector<float>& vKnots);
     void addCylinder(float radius, float height);
+    void addSphere(float radius);
     //@}
 
     /** @name Bounding Box handling */