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  • Published 11 Jun 2022

Blender 3.2 VERTEX COLOR!!!

In blender 3.2 I have added vertex color to the cube but when exported to the following file format (FBX, ABC, OBJ....) vertex color is not saved within the file & when viewed in a different software it shows that there is no vertex color data! How can the vertex color be saved to the file formats in Blender 3.2 to be viewed in other software? BLENDER VC.jpg

penpcm
11 Jun 2022

11 Comments

pablovazquez

Not sure what types of Vertex Color can that 3D viewer preview, but in that example you created Vertex (domain), full color.

Try creating a new attribute in the Face Corner domain, Byte Color data type. vertex color

You can convert existing attributes. The operator is available when you search for "Convert Attribute" when "Developer Extras" is enabled (Interface section of User Preferences): convert

5
penpcm Author

thanks, Pablo, it worked!

1
laurenstjong

I tried converting the vertex color to byte color, but is has two issues:

  1. You cannot bake Ambient Occlusion to byte vertex color
  2. When exporting Fbx it does not show up in Unreal Engine

I will look further into this and create a bug report

edit: You are right anyway i forgot to convert to "face corner" instead of vertex

1
laurenstjong

Hi Pablo, sorry to bother again, but I was curious if exporting "vertex domain" data to .fbx or any other format is planned or further investigated? Or do I get it wrong and is it an issue with the target engine... for example Unreal just does not read the vertex color data in that case?

If this is the case, Ill ask Tim Sweeney.

Because baking to vertex is a bit nicer that baking to face corner:

alt text

Anyway, have a great day!

jontemyra

Having the same issue here with exported fbx:es unless I convert the attribute to byte color like Pablo suggested. Seems like the fbx-exporter addon is not working with the new "color_attributes" AttributeGroup added in 3.2. Looking in " export_fbx_bin.py " line 1116, the Vcolors is gotten from me.vertex_colors which doesn't contain the new color attributes with type of "float color" and doesn't get written to the FBX file.

3
bill.critchfield

I am not really sure MS 3D viewer is the best tool to verify vertex color. I tested a round trip from blender to fbx and back into blender. The vertex colors were still present. I also imported the fbx to Painter and was able to bake an ID map from the vertex colors, so I think the vertex attributes carry over at export. The 3D viewer does give me the exact results you are seeing.

1
penpcm Author

yes its true, MS 3D viewer deceived me :(

bee

3.3.0 Still no Vertex color exporting. Tested in Blender (by re-importing) and with Unity.

jonazdk

Sitting with the exact same problem. And the problem might not be Blender. But more Unreal Engine (4.27.2) in my case has vertex colors disabled on import.

So in the mesh view Go to Details > Import settings > Set 'Vertex Import Option' to Replace. Now Reimport base mesh.. and vertex colors should show up on the mesh if enabled in the mesh viewer.

In a quick test I did this morning.. the red was orange though... soo something IS up in the FBX export.

imgur.com/clbreQA.png

bee

Found the solution! In 3.3.0 You MUST have your color set to Face Corner AND Byte Color or FBX will not encode the colors into the verts.

1
jmdee

Thank you so much for posting this. I have just spent hours (4?) trying to solve this but no luck until I found this comment. Thank you for sharing and helping out this stranger on the internets.