unwrapper.packAtlas(...) goes wrong

[AD2018]

Here is the code

package.json

before unwrapping

here is the result of the unwrap(unwrapper.packAtlas(...))

I pass to unwrapper.packAtlas(...) array with only one geometry:

UPD: meanwhile with the model from this github project https://github.com/lucas-jones/three-lightmap-baker all is ok:

what is the problem?

[repalash]

Hi, can you share the 3d model which has this issue?

[mattni]

Hi!
Thanks for great library, it works mainly very well! I have similar issue unwrapping issue with some geometries. I don't understand why geometry get broken.

The issue occurs only with rounded geometries (usually small triangles). Do you know what is the problem?

Example of broken model (single geometry) below.

not_working_geometry_glb.zip

[gkjohnson]

It looks like this could be due to the geometry's index array being set to use a Uint32 buffer while XAtlas.js is only designed to support Uint16 index arrays. The model contains more than 80,000 vertices while Uint16 indices only support up to around 65,500 vertices. Looking at the XAtlas code, though, it looks like it would be possible to enable support for either Uint16 or Uint32 indices here.

Or, more simply, the code could be changed to just support Uint32 indices and the buffer could be converted when set, similar to #11.

edit
Not sure if these lines that read the index buffer back as an array of Uint32s rather than Uint16s may have something to do with it, too.