I am trying to use UVAtlas code from github in order to create a uv atlas for a 50k triangle scene.

I am beyond confused right now because of the data it returns to me:

1) Why does it return so many vertices? why does it return indices in that weird form? What does it expect me to do? I just have a list of vertices and I need UV coords generated for each one, not more, not less! why does it give me all these extra vertices???

2) How do I actually generate the texture/lightmap from this? By lightmap I mean a lightmap without the lighting computed yet.

3) Should I just not use this tool and use libigl instead?

Thanks all

for question 1:

We use UvAtlas in production to unwrap uv.

after uv is unwrap, face number remain the same, but vertex number may increase. Try to image unwarp a teapot onto a texture, parts of the teapot must be separated, so some vertex is duplicated, and position at different place on uv space.

to use UvAtlas:

1.DirectX::GenerateAdjacencyAndPointRep

2.DirectX::UVAtlasCreate

3.DirectX::UVAtlasApplyRemap

Can't remember the detail, take a look at the command line tools MS provided will help.