UI/material index bug related to shader node, cycles baking. #75427

New Issue

Omar · 2020-04-06T05:12:12+02:00

Omar commented

2020-04-06 05:12:12 +02:00

System Information
Operating system: Linux-5.3.0-7642-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.64

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: 375c7dc4ca
Worked: (optional)

Short description of error
A UI bug shows an image being selected in the shader for baking, when it is actually not selected. Additionally the warning message from baking about the non-active image texture gives the wrong material index, by -1.

Exact steps for others to reproduce the error

Open blender 2.82, and select general.
Go to edit mode, and select a face on the cube.
Add a second material slot for the cube.
Create a new material in it, and assign it to the face in edit mode.
For the second material, using the node editor, add a checker texture with shift-a and connect it to the base color of the default principled shader.
Select the first material, and add an image texture to it. Select new and create a blank image.
IMPORTANT Now copy the image texture with control-c, and paste it with control-v in the second material.
Do a sanity check by moving the image texture around a bit with the mouse in both materials.
Switch the render engine to cycles and bake.

Observe the warning message in the scripting view, specifically the material index. Additionally go into texture painting and notice the missing textures.
Observe the UI is acting like you have selected the image texture in the second material, but that is not true.

You can test with more materials using the setup of the second material, sandwiched between the first material, to further confirm the index and UI error.

To fix this you must go to the second material and press "a" to select all nodes, then double press "a" to deselect everything, and then select the image texture with the mouse. Now if you switch to texture painting the missing texture shading will instead be alpha. Baking now works correctly.

This bug has persisted for me between reloads, and when copying objects.

**System Information** Operating system: Linux-5.3.0-7642-generic-x86_64-with-debian-buster-sid 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.64 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: `375c7dc4ca` Worked: (optional) **Short description of error** A UI bug shows an image being selected in the shader for baking, when it is actually not selected. Additionally the warning message from baking about the non-active image texture gives the wrong material index, by -1. **Exact steps for others to reproduce the error** 1. Open blender 2.82, and select general. 2. Go to edit mode, and select a face on the cube. 3. Add a second material slot for the cube. 4. Create a new material in it, and assign it to the face in edit mode. 5. For the second material, using the node editor, add a checker texture with shift-a and connect it to the base color of the default principled shader. 6. Select the first material, and add an image texture to it. Select new and create a blank image. 7. *IMPORTANT* Now copy the image texture with control-c, and paste it with control-v in the second material. 8. Do a sanity check by moving the image texture around a bit with the mouse in both materials. 9. Switch the render engine to cycles and bake. Observe the warning message in the scripting view, specifically the material index. Additionally go into texture painting and notice the missing textures. Observe the UI is acting like you have selected the image texture in the second material, but that is not true. You can test with more materials using the setup of the second material, sandwiched between the first material, to further confirm the index and UI error. To fix this you must go to the second material and press "a" to select all nodes, then double press "a" to deselect everything, and then select the image texture with the mouse. Now if you switch to texture painting the missing texture shading will instead be alpha. Baking now works correctly. This bug has persisted for me between reloads, and when copying objects.

Omar commented

2020-04-06 05:12:12 +02:00

Added subscriber: @Omer-Almadani

Germano Cavalcante commented

2020-04-07 14:28:10 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-04-07 14:28:10 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Germano Cavalcante commented

2020-04-07 14:28:10 +02:00

Observe the UI is acting like you have selected the image texture in the second material, but that is not true.

Why isn't it true? You did not specify which texture to select last in: "8. Do a sanity check by moving the image texture around a bit with the mouse in both materials."

Thanks for the report. Unfortunately the scenario described is too time consuming for us to track down, we require the bug reporter to narrow down the problem.
If there are many steps to reproduce the problem, please attach a .blend file saved right before the bug occurs, so only a few steps are needed to trigger the bug.

> Observe the UI is acting like you have selected the image texture in the second material, but that is not true. Why isn't it true? You did not specify which texture to select last in: "8. Do a sanity check by moving the image texture around a bit with the mouse in both materials." Thanks for the report. Unfortunately the scenario described is too time consuming for us to track down, we require the bug reporter to narrow down the problem. If there are many steps to reproduce the problem, please attach a .blend file saved right before the bug occurs, so only a few steps are needed to trigger the bug.

Omar commented

2020-04-08 06:40:53 +02:00

#75427.blend

![material_two.png](https://archive.blender.org/developer/F8456109/material_two.png) ![missing_texture.png](https://archive.blender.org/developer/F8456108/missing_texture.png) ![material_one.png](https://archive.blender.org/developer/F8456107/material_one.png) [#75427.blend](https://archive.blender.org/developer/F8456106/T75427.blend) ![bake_info.png](https://archive.blender.org/developer/F8456105/bake_info.png)

Omar commented

2020-04-08 06:44:07 +02:00

It is not true because blender doesn't consider it select, only the UI. In step 8 I wrote move the textures in both materials. It doesn't matter which one is selected last because they should be both selected together. In the attached blend file just hit bake. Also I attached images to better show what I am referring to.

Germano Cavalcante commented

2020-04-08 14:39:42 +02:00

The problem of not detecting the active material is the same as described in #74713.
So I will merge the reports.

But I confirm that the material indicated in the message is wrong.
I don't know about the slot, the index for material two is 1 as you can see in the previous lines.

I'll fix the name issue.

The problem of not detecting the active material is the same as described in #74713. So I will merge the reports. But I confirm that the material indicated in the message is wrong. I don't know about the slot, the index for material two is 1 as you can see in the previous lines. I'll fix the name issue.

Germano Cavalcante commented

2020-04-08 14:52:23 +02:00

The problem with the wrong material name was resolved in 34b28850bf

The problem with the wrong material name was resolved in 34b28850bf

Germano Cavalcante commented

2020-04-08 14:52:37 +02:00

Closed as duplicate of #74713

Germano Cavalcante closed this issue

2020-04-08 14:52:37 +02:00

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UI/material index bug related to shader node, cycles baking. #75427