Data transfer modifier is not transfering vertex colours #81996

New Issue

Frankie Hobbins · 2020-10-23T10:42:50+02:00

Frankie Hobbins commented

2020-10-23 10:42:50 +02:00

System Information
Operating system: win10
Graphics card: 2080ti

Blender Version
Broken: blender-2.91.0-baa24f1c91d2-windows64

Short description of error
It seems impossible to transfer vertex colours from one mesh to another using data transfer modifier.

Exact steps for others to reproduce the error
data transfer vertex colour bug.blend
Load blend file
The plane has a data transfer modifier set to take vertex colours from the cube.
No matter what settings are picked it seems impossible to make any data transfer happen.

**System Information** Operating system: win10 Graphics card: 2080ti **Blender Version** Broken: blender-2.91.0-baa24f1c91d2-windows64 **Short description of error** It seems impossible to transfer vertex colours from one mesh to another using data transfer modifier. **Exact steps for others to reproduce the error** [data transfer vertex colour bug.blend](https://archive.blender.org/developer/F9046109/data_transfer_vertex_colour_bug.blend) Load blend file The plane has a data transfer modifier set to take vertex colours from the cube. No matter what settings are picked it seems impossible to make any data transfer happen.

Frankie Hobbins commented

2020-10-23 10:42:50 +02:00

Added subscriber: @FrankieHobbins

Philipp Oeser commented

2020-10-23 13:37:05 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-10-23 13:37:05 +02:00

Looks like the source has zero alpha.

You can confirm by opening your file, selecting the Source object, go to Vertex Paint mode, and add alpha with the Brush Settings set to Add Alpha
data transfer vertex colour bug_add_alpha_brush.blend

The source vertex color layer is transferred premutliplied, so if you have zero alpha in the source, the color on the Target wont be changed.
I am also not sure if this is the right thing to do in the context of the Data Transfer modifier, but this is then exactly the same question as in this report #81914 (Data Transfer modifier works inconsistently when dealing with Vertex Color Alpha).

I will merge these reports, just one question though: why do you have zero alpha in the source vertex color? Have you used the Erase Alpha brush setting?

Looks like the source has zero alpha. You can confirm by opening your file, selecting the `Source` object, go to `Vertex Paint` mode, and add alpha with the Brush Settings set to `Add Alpha` [data transfer vertex colour bug_add_alpha_brush.blend](https://archive.blender.org/developer/F9048490/data_transfer_vertex_colour_bug_add_alpha_brush.blend) The source vertex color layer is transferred premutliplied, so if you have zero alpha in the source, the color on the Target wont be changed. I am also not sure if this is the right thing to do in the context of the Data Transfer modifier, but this is then exactly the same question as in this report #81914 (Data Transfer modifier works inconsistently when dealing with Vertex Color Alpha). I will merge these reports, just one question though: why do you have zero alpha in the source vertex color? Have you used the Erase Alpha brush setting?

Philipp Oeser commented

2020-10-23 13:37:22 +02:00

Closed as duplicate of #81914

Philipp Oeser closed this issue

2020-10-23 13:37:22 +02:00

Frankie Hobbins commented

2020-10-23 13:47:09 +02:00

I see, thanks for the detailed reply. I can confirm it does work when used with alpha.

I don't have any alpha because I'm not using it. My workflow takes it into unity game engine and some data will be packed inside the alpha channel (not sure what at the moment, maybe roughness, emissive or ao)

I've assigned the vertex colours with a plugin I made (there's no documentation sorry) https://github.com/FrankieHobbins/Blender-FrankiesVertexColourToolkit

I see, thanks for the detailed reply. I can confirm it does work when used with alpha. I don't have any alpha because I'm not using it. My workflow takes it into unity game engine and some data will be packed inside the alpha channel (not sure what at the moment, maybe roughness, emissive or ao) I've assigned the vertex colours with a plugin I made (there's no documentation sorry) https://github.com/FrankieHobbins/Blender-FrankiesVertexColourToolkit ![image.png](https://archive.blender.org/developer/F9048675/image.png)

Philipp Oeser commented

2020-10-23 13:58:41 +02:00

Ok, thx getting back.
Good to know that you made these with zero alpha on purpose.

Lets see what other devs have to say about the alpha "issue" in #81914

Ok, thx getting back. Good to know that you made these with zero alpha on purpose. Lets see what other devs have to say about the alpha "issue" in #81914

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Data transfer modifier is not transfering vertex colours #81996