3D Object converter: fixed bug for models using p and pt shader
3D Object converter: fixed bug for models using p and pt shader

Hvitnov/WebViewer,OpenWebGlobe/WebViewer,OpenWebGlobe/WebViewer,Hvitnov/WebViewer,OpenWebGlobe/WebViewer,robhawkes/WebViewer,robhawkes/WebViewer,Hvitnov/WebViewer,robhawkes/WebViewer,OpenWebGlobe/WebViewer,Hvitnov/WebViewer,robhawkes/WebViewer