GlTF: export mesh transparency #105205

New Issue

Pratik Borhade · 2024-02-29T06:13:25+01:00

Pratik Borhade commented

2024-02-29 06:13:25 +01:00

System Information
Operating system: macOS-14.2.1-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M2 1.2

Blender Version
Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: 9be62e85b727
Worked: version 3.6.9, branch: blender-v3.6-release, commit date: 2024-02-19 16:48, hash: e958717a0c25

Short description of error
When exporting to glTF, either the .gltf file or the .glb file, the object's appearance is completely broken.

Exact steps for others to reproduce the error

Have a scene with a single object with correct mesh, correct material
Export to glTF (any settings)
Import exported file into software of choice (works even when back into blender)
Object seems completely broken

glypse logo buggy glTF export.blend

Original report at: blender/blender#118871

**System Information** Operating system: macOS-14.2.1-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M2 1.2 **Blender Version** Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: `9be62e85b727` Worked: version 3.6.9, branch: blender-v3.6-release, commit date: 2024-02-19 16:48, hash: `e958717a0c25` **Short description of error** When exporting to glTF, either the .gltf file or the .glb file, the object's appearance is completely broken. **Exact steps for others to reproduce the error** 1. Have a scene with a single object with correct mesh, correct material 2. Export to glTF (any settings) 3. Import exported file into software of choice (works even when back into blender) 4. Object seems completely broken [glypse logo buggy glTF export.blend](https://projects.blender.org/attachments/d5609e17-d81f-433e-8c56-51a14695ac09) Original report at: https://projects.blender.org/blender/blender/issues/118871

Pratik Borhade added the

labels 2024-02-29 06:13:43 +01:00

Pratik Borhade referenced this issue from blender/blender

2024-02-29 06:14:09 +01:00

Buggy glTF export, broken mes transparency #118871

Pratik Borhade commented

2024-02-29 06:15:16 +01:00

This is due to wrong blend mode: image
cc @JulienDuroure

This is due to wrong blend mode: [image](/attachments/51afde4d-a2fa-4574-b56e-a2cd0426bacb) cc @JulienDuroure

image.png

30 KiB

Pratik Borhade added

and removed

labels 2024-02-29 06:15:23 +01:00

Julien Duroure commented

2024-02-29 09:03:46 +01:00

Hello,

Don't think there is any bug here.
Unfortunaly, there is sometime where there is no 100% compatibility between Blender and glTF.

As said, the alpha mode is set to Hashed. This is not something that exist in glTF, so we export it as blend mode.
(More about why alpha hashed is exported as alpha blend here : https://github.com/KhronosGroup/glTF-Blender-IO/pull/1195)

Closing this ticket

Hello, Don't think there is any bug here. Unfortunaly, there is sometime where there is no 100% compatibility between Blender and glTF. As said, the alpha mode is set to Hashed. This is not something that exist in glTF, so we export it as blend mode. (More about why alpha hashed is exported as alpha blend here : https://github.com/KhronosGroup/glTF-Blender-IO/pull/1195) Closing this ticket

Julien Duroure closed this issue

2024-02-29 09:03:47 +01:00

Blender Bot added

and removed

labels 2024-02-29 09:03:48 +01:00

Pratik Borhade commented

2024-02-29 09:36:04 +01:00

Thanks :)