Baking diffuse map generates black image if the UV is not on UDIM tile 1001 #79360

New Issue

Kei Muratagawa · 2020-07-29T07:11:10+02:00

Kei Muratagawa commented

2020-07-29 07:11:10 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.77

Blender Version
Broken: version: 2.83.2, branch: master, commit date: 2020-07-09 05:50, hash: 239fbf7d93
Worked: Unknown (also broken in 2.90.0 Beta, branch: master, commit date: 2020-07-27 20:19, hash: 221604cdd6)

Short description of error

bake_bug.mp4

When using UDIM, you can bake the diffuse map with Cycles only if the UV is on tile 1001. However if not on 1001, a completely black image will be generated.

Moving the UV to 1001 fixes the problem. But it is troublesome to move the UV to their original position again.

Exact steps for others to reproduce the error

bake_bug.blend

Download "bake_bug.blend", "Diffuse UDIM.1001.png" and "Diffuse UDIM.1002.png" into the same directory.
Open 'bake_bug.blend'.
Select Cube (its UV locates on "1001").
Click "Bake". ("Render property > Bake > Bake button")
Baked diffuse map appears in UV Editor. [Success]1. SelectSphere (its UV locates on "1002").
Click "Bake".
Nothing happens in UV Editor. [Failed]
Go into Edit mode.
Move Sphere's UV to 1001.
Click "Bake" again.
Baked diffuse map appears in UV Editor. [Success]

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.77 **Blender Version** Broken: version: 2.83.2, branch: master, commit date: 2020-07-09 05:50, hash: `239fbf7d93` Worked: Unknown (also broken in 2.90.0 Beta, branch: master, commit date: 2020-07-27 20:19, hash: `221604cdd6`) **Short description of error** [bake_bug.mp4](https://archive.blender.org/developer/F8727503/bake_bug.mp4) When using UDIM, you can bake the diffuse map with Cycles only if the UV is on tile 1001. However if not on 1001, a completely black image will be generated. Moving the UV to 1001 fixes the problem. But it is troublesome to move the UV to their original position again. **Exact steps for others to reproduce the error** [bake_bug.blend](https://archive.blender.org/developer/F8727515/bake_bug.blend) ![Diffuse UDIM.1001.png](https://archive.blender.org/developer/F8727517/Diffuse_UDIM.1001.png) ![Diffuse UDIM.1002.png](https://archive.blender.org/developer/F8727518/Diffuse_UDIM.1002.png) 1. Download **"bake_bug.blend", "Diffuse UDIM.1001.png" and "Diffuse UDIM.1002.png"** into the same directory. 1. Open **'bake_bug.blend'**. 1. Select **Cube** (its UV locates on "1001"). 1. Click *"Bake"*. ("Render property > Bake > Bake button") 1. Baked diffuse map appears in UV Editor. **[Success]**1. Select**Sphere** (its UV locates on "1002"). 1. Click *"Bake"*. 1. Nothing happens in UV Editor. **[Failed]** 1. Go into Edit mode. 1. Move Sphere's UV to 1001. 1. Click *"Bake"* again. 1. Baked diffuse map appears in UV Editor. **[Success]**

Kei Muratagawa commented

2020-07-29 07:11:10 +02:00

Added subscriber: @muratagawa