Hi @imantahriri, I'm afraid they couldn't understand what the "linestrip" geometry for COLLADA format is. I think "linestrip" usually means a polygonal line consisting of multiple consecutive line segments (a kind of line geometry), but the COLLADA format only supports surface geometry, doesn't support line.

If you mean triangle strip surface geometry, the GeometryPartExtractor might help you to transform the surfaces into polygons. Can you post a sample data to think of a concrete way?