ENH: Test the visibility on/off

Base/Materials/imstkRenderMaterial.cpp

@@ -207,5 +207,4 @@ RenderMaterial::getVisibility() const
 {
     return m_isVisible;
 }
-
 }

Examples/Sandbox/main.cpp

@@ -2515,6 +2515,10 @@ void testVirtualCoupling()
     obj->setCollidingGeometry(collidingGeom);
     obj->setVisualGeometry(visualGeom);
 
+    auto material = std::make_shared<RenderMaterial>();
+    //material->setVisibilityOff();
+    visualGeom->setRenderMaterial(material);
+
     // Add virtual coupling object (with visual, colliding, and physics geometry) in the scene.
     scene->addSceneObject(obj);