Linestrips and other primitive types are not supported about collada2gltf HOT 3 OPEN

I'm having another stab at this. I'm initially adding support for linestrips but will add TRIANGLE_STRIPS/FANS later on once I understand the code better.

It's tempting to just triangulate TRIANGLE_FANS like the converter does for POLYGONS and POLYLIST as fans are usually small primitives. Triangle strips are often used for terrain rendering and in high res models - often created by mesh optimisation libs that group as many triangles into strips as possible.

Related issues:
KhronosGroup/glTF#129
KhronosGroup/glTF#135

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@bjbrewster, just a heads up glTF does support line strips, triangle strips and triangle fans as a primitive mode, so you don't need to do any extra processing or triangulation, just set the correct mode.

The 2.0 branch already does this, but a contribution adding the support for 1.0 would be welcome.

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@lasalvavida thanks for the heads up. Enabling LINE_STRIPS mode is trivial. I just have to add support to the geometry helper that splits the mesh when more then 65K vertices.

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