KhronosGroup / KhronosGroup/glTF
Need more information on properly extracting TEXCOORD_0 from compressed data.
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Description
I am having trouble with this exported GLFT model with Draco Compression and your document is not helping.
The UV coordinate came out all wrong.
There are 3 primitives each pointing to a different BufferView.
```
"meshes": [
{
"primitives": [
{
"attributes": {
"TEXCOORD_0": 1,
"NORMAL": 2,
"TANGENT": 3,
"POSITION": 4
},
"indices": 0,
"material": 0,
"mode": 4,
"extensions": {
"KHR_draco_mesh_compression": {
"bufferView": 0,
"attributes": {
"TEXCOORD_0": 0,
"NORMAL": 1,
"TANGENT": 2,
"POSITION": 3
}
}
}
}
],
"name": "LanternPole_Body"
},
{
"primitives": [
{
"attributes": {
"TEXCOORD_0": 6,
"NORMAL": 7,
"TANGENT": 8,
"POSITION": 9
},
"indices": 5,
"material": 0,
"mode": 4,
"extensions": {
"KHR_draco_mesh_compression": {
"bufferView": 1,
"attributes": {
"TEXCOORD_0": 0,
"NORMAL": 1,
"TANGENT": 2,
"POSITION": 3
}
}
}
}
],
"name": "LanternPole_Chain"
},
{
"primitives": [
{
"attributes": {
"TEXCOORD_0": 11,
"NORMAL": 12,
"TANGENT": 13,
"POSITION": 14
},
"indices": 10,
"material": 0,
"mode": 4,
"extensions": {
"KHR_draco_mesh_compression": {
"bufferView": 2,
"attributes": {
"TEXCOORD_0": 0,
"NORMAL": 1,
"TANGENT": 2,
"POSITION": 3
}
}
}
}
],
"name": "LanternPole_Lantern"
}
],
```
My code to iterate over primitives to extract geometry:
```
for (var k=0; k
Contributor guide
Research direction
Use the provided glTF primitives and the decodeDracoFile call as the reproduction starting point, and compare the existing Draco documentation with the reported TEXCOORD_0 behavior. Done means the documentation explains how compressed attribute mappings and buffer views should be handled, with the supplied model and UV result used to verify the guidance.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- computer-graphics, documentation
- Issue type
- Documentation
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 28/100