Meshes are corrupted

Question

schwarzsky opened this issue 2 years ago · comments

As you can see, you can saw the back of the meshes. This is not supposed to be happen. Any idea? Tried lowering compressionSize.

Sean Lilley · Answer 1 · Tue Jun 21 2022 02:41:53 GMT+0800 (China Standard Time)

@schwarzsky could you post the full command? Is this just a problem with Draco compression?

Sean Lilley · Answer 2 · Tue Jun 21 2022 02:42:41 GMT+0800 (China Standard Time)

Also if you can post the original glTF that would be helpful too

schwarzsky · Answer 3 · Tue Jun 21 2022 02:57:14 GMT+0800 (China Standard Time)

First used npx gltf-pipeline -i SnowyTerrain.glb -d --draco.compressionLevel 10 -o Snowy.glb
Then downed scale to 10 to 1.

I don't own the builds its not right to post GLB file but if you want it anyway i can get permission i think.

Also yes, this is a problem with Draco compression. Before compression model looks quite right. @lilleyse

Sean Lilley · Answer 4 · Tue Jun 21 2022 03:22:47 GMT+0800 (China Standard Time)

A couple more options you could try:

--draco.unifiedQuantization - this will compress all primitives using the same quantization grid. Depending on how large the scene is this could actually lead to worse results. But worth trying to narrow down the bug.
--draco.quantizePositionBits - default is 11, keep using higher values up to 16 or so and see if it makes a difference

schwarzsky · Answer 5 · Tue Jun 21 2022 07:43:04 GMT+0800 (China Standard Time)

Just used --draco.unifiedQuantization and solved the issue. Thanks!