Regression: Data transfer modifier no longer respects vertex group for transfers of vertex color #104475

New Issue

Nathan Vasil · 2023-02-08T17:16:50+01:00

Nathan Vasil commented

2023-02-08 17:16:50 +01:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94

Blender Version
Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: rB55485cb379f7
Broken: version: 3.5.0 Alpha, branch: master, commit date: 2023-02-01 22:06, hash: rBd82ffb9787c3
Worked: version: 3.1.2, branch: master, commit date: 2022-03-31 17:40, hash: rBcc66d1020c3b

Caused by eae36be372

Short description of error
When used to transfer color, either as vertex data or as face corner data, the data transfer modifier doesn't use any vertex groups specified for the modifier-- it transfers color to all vertices, regardless of their assignment to any vertex group.

Exact steps for others to reproduce the error

This screenshot should demonstrate the issue. I have two planes, both with vertex color layers with the same name but with different colors assigned to the layers. We give a data transfer modifier to one plane to copy color from the other. We limit that data transfer modifier by a vertex group and assign some vertices to that group.

Here, I'm using a displace modifier on the left to demonstrate which vertices are assigned to "Group", and I have the data transfer modifiers disabled so that you can see the vertex color layers. On the right, we have the same planes, but the data transfer modifiers have been enabled; we see that the data transfer has affected all vertices, not just those assigned to Group. I'm using two different data transfer layers, and two different vertex color layers, to test that the issue exists in both types of vertex color layers.

This problem exists for both face-corner and vertex data type vertex color layers, and exists regardless of mapping used for the data transfer; the last time it worked, we didn't have the option for vertex data type vertex colors. It is not just a display issue or an issue with the live modifier; applying the modifier and inspecting the vertex color afterwards shows that it wrote the color to all vertices. Data transfer of vertex groups seems to be working appropriately still (can still limit that transfer with a vertex group) so this seems to be limited to treatment of vertex color.

File used to create the above is attached.

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94 **Blender Version** Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: `rB55485cb379f7` Broken: version: 3.5.0 Alpha, branch: master, commit date: 2023-02-01 22:06, hash: `rBd82ffb9787c3` Worked: version: 3.1.2, branch: master, commit date: 2022-03-31 17:40, hash: `rBcc66d1020c3b` Caused by eae36be372a6b16ee3e76eff0485a47da4f3c230 **Short description of error** When used to transfer color, either as vertex data or as face corner data, the data transfer modifier doesn't use any vertex groups specified for the modifier-- it transfers color to all vertices, regardless of their assignment to any vertex group. **Exact steps for others to reproduce the error** ![image](/attachments/96a9f650-3f6e-4a40-ab07-513729f68099) This screenshot should demonstrate the issue. I have two planes, both with vertex color layers with the same name but with different colors assigned to the layers. We give a data transfer modifier to one plane to copy color from the other. We limit that data transfer modifier by a vertex group and assign some vertices to that group. Here, I'm using a displace modifier on the left to demonstrate which vertices are assigned to "Group", and I have the data transfer modifiers disabled so that you can see the vertex color layers. On the right, we have the same planes, but the data transfer modifiers have been enabled; we see that the data transfer has affected all vertices, not just those assigned to Group. I'm using two different data transfer layers, and two different vertex color layers, to test that the issue exists in both types of vertex color layers. This problem exists for both face-corner and vertex data type vertex color layers, and exists regardless of mapping used for the data transfer; the last time it worked, we didn't have the option for vertex data type vertex colors. It is not just a display issue or an issue with the live modifier; applying the modifier and inspecting the vertex color afterwards shows that it wrote the color to all vertices. Data transfer of vertex groups seems to be working appropriately still (can still limit that transfer with a vertex group) so this seems to be limited to treatment of vertex color. File used to create the above is attached.

vcolbug.blend

865 KiB

image.png

946 KiB

Nathan Vasil added the

labels 2023-02-08 17:16:51 +01:00

Philipp Oeser commented

2023-02-09 09:41:38 +01:00

Can confirm, will check

Philipp Oeser added

and removed

labels 2023-02-09 09:41:50 +01:00

Philipp Oeser commented

2023-02-09 10:42:50 +01:00

Caused by eae36be372

CC @JosephEagar

Caused by eae36be372a6b16ee3e76eff0485a47da4f3c230 CC @JosephEagar

Philipp Oeser added the

Module

Sculpt, Paint & Texture

label 2023-02-09 10:43:10 +01:00

Philipp Oeser changed title from ~~Data transfer modifier no longer respects vertex group for transfers of vertex color~~ to Regression: Data transfer modifier no longer respects vertex group for transfers of vertex color

2023-02-09 10:44:24 +01:00

Philipp Oeser added

and removed

labels 2023-02-09 10:44:41 +01:00

Julien Kaspar added

Type

Bug

and removed