Erratic behaviour of materials/material slots for text objects #109491

New Issue

Dan Silden · 2023-06-29T10:57:00+02:00

Dan Silden commented

2023-06-29 10:57:00 +02:00

System Information
Operating system: Linux-5.19.0-45-generic-x86_64-with-glibc2.35 64 Bits, X11 UI
Graphics card: NVIDIA GeForce GTX 980M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.108.03

Blender Version
Broken: version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash: c7fc78b81ecb

Short description of error
Material assignment for text objects doesn't behave as expected. Removing an unused material slot will cause changes to the materials used by the object. The same happens if you rearrange the material slots.

Exact steps for others to reproduce the error

Add a new text object. Leave the default string "Text".
Add 3 new material slots with different materials to the object. Use different viewport display colors to be able to see changes.
(You will now have Material.001, Material.002 and Material.003)
In edit mode, select the last two letters and assign Material.002.
(You should now have "Te" using Material.001 and "xt" using Material.002)
In object mode, remove the last material slot containing Material.003.
(This material was not assigned to any character, and removing it should not cause any change.)
All 4 letters are now using Material.001. "xt" should still be using Material.002.

Alternatively, execute step 1-3 above and then.
4. Move the last material slot up to the first place.
(This should not cause any change. Normally in blender, the materials used by the geometry will not change if you rearrange the material slots.)
5. You will now have "Te" using Material.004 and "xt" using Material.002. "Te" should still be using Material.001.

I have attached a blend file where you just need to remove the last (unused) material slot to see the problem, or move the last material slot up to first position.

**System Information** Operating system: Linux-5.19.0-45-generic-x86_64-with-glibc2.35 64 Bits, X11 UI Graphics card: NVIDIA GeForce GTX 980M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.108.03 **Blender Version** Broken: version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash: `c7fc78b81ecb` **Short description of error** Material assignment for text objects doesn't behave as expected. Removing an unused material slot will cause changes to the materials used by the object. The same happens if you rearrange the material slots. **Exact steps for others to reproduce the error** 1. Add a new text object. Leave the default string "Text". 2. Add 3 new material slots with different materials to the object. Use different viewport display colors to be able to see changes. (You will now have Material.001, Material.002 and Material.003) 3. In edit mode, select the last two letters and assign Material.002. (You should now have "Te" using Material.001 and "xt" using Material.002) 4. In object mode, remove the last material slot containing Material.003. (This material was not assigned to any character, and removing it should not cause any change.) 5. All 4 letters are now using Material.001. "xt" should still be using Material.002. Alternatively, execute step 1-3 above and then. 4. Move the last material slot up to the first place. (This should not cause any change. Normally in blender, the materials used by the geometry will not change if you rearrange the material slots.) 5. You will now have "Te" using Material.004 and "xt" using Material.002. "Te" should still be using Material.001. I have attached a blend file where you just need to remove the last (unused) material slot to see the problem, or move the last material slot up to first position.

text_material_bug.blend

890 KiB

Dan Silden added the

labels 2023-06-29 10:57:01 +02:00

Philipp Oeser commented

2023-06-29 11:14:05 +02:00