What about just a mesh optimize?

[WallanceLee]

Well, I am working at revit-export-gltf plugin development. The workflow is as follow:
revit-plugin outputs the data structure of revit data, and I transforms it into gltf nodes(with accessors, meshes, primitives and ...)
but as the revit data gets larger, I must write some optimized code, so I use meshoptimizer and draco to optimize mesh(I write some C++ code to optimize each mesh) and compress my gltf output data.
But I find some very interesting things, meshoptimizer repo README.md just say I should weld before I used their mesh_simplify method, so I find this repo with give the optimize pipeline and weld function within it. So I want to develop a function just weld a mesh. But I don't know whether this works for my optimization?

[donmccurdy]

If you want to just weld vertices and do nothing else — that is what you're asking, correct? — then you can use the weld() JavaScript function. Or if you'd prefer, this function is also available through the glTF Transform commandline:

gltf-transform weld in.glb out.glb

[WallanceLee]

Yes, but I just want to rewrite weld function with input of positions, indices and maybe other parameters. JavaScript code may be hard to integrate into my C++ code, may I rewrite your code into C++-lang with repsect to your project's open source LICENSE?

[donmccurdy]

@WallanceLee that's entirely OK with me — and in any case the MIT License allows it. :)

My implementation of welding is based partially on code from meshoptimizer / gltfpack (C/C++) so that might be a clearer reference too:

https://github.com/zeux/meshoptimizer/blob/fc45e051a8512817c488c61f7650d7f84c814c1f/src/indexgenerator.cpp#L37

[WallanceLee]

Thanks a lot, I think I find the solution according to your reply.