Texture3d does not support the ALPHA PixelFormat
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Description
### Feature
I found that Texture3d has an issue with supporting the ALPHA PixelFormat, and the code needs to be slightly adjusted.
The fix is relatively simple. For the ALPHA PixelFormat, instead of using gl.texSubImage3D to write data, use gl.texImage3D to write data, and this issue can be fixed. But I don't know why!
I wonder if any friend can help submit a PR to fix this issue; I would be very grateful.
We can verify this issue through the following link, which is a slightly adjusted version of VolumeCloud:
https://sandcastle.cesium.com/#c=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
Contributor guide
Research direction
Start by locating the Texture3d implementation and the ALPHA PixelFormat path that invokes gl.texSubImage3D; compare it with the suggested gl.texImage3D behavior. Reproduce the case using the linked VolumeCloud Sandcastle example and confirm that ALPHA 3D textures work correctly.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- computer-graphics
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100