What does this do different compared to https://github.com/ands/trianglepacker ?

[ands]

Good to know that somebody tries to improve my code ;)
What exactly are the differences between our trianglepackers?

[ray-cast]

I have tried to use your project in my project, i think it's works well in the most time, but it can't support the quad polygon, it'll cause the vertices of the model much more than origin model, so i'm trying to write a project to improve your trianglepacker.

In most case, the model is converted from a quad to two triangle.
For example: Quad indices: (0 1 2 3) to Triangle indices (0, 2, 1), (2, 3, 1)

This method is looks like blender's lightmappack, that can be extended to support these types of quad polygon, when two triangle are (0, 2, 1), (2, 3, 1).

[ray-cast]

so, two triangle become combined and can result in a quad, but not finished yet, and i think the rectangle pack is a good structure for texture sampling.

are not two triangle:

[ands]

That sounds great! This was actually the feature I always wanted to add, but never got around to actually do :)