Modding:Custom Hair Highlights

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Highlights/graying is controlled by vertex paint in BG3.

Black = Base hair (no graying/no highlights)

Red (#FF0000) = graying

Blue (#0000FF) = highlights

Green (#00FF00) = thickness

You can add highlights to your custom hair using the tools built into Blender.

Select a portion of your hair mesh. Go up to Object Mode and change to Vertex Paint mode. Make sure your shading is set to Viewport Shading.
Set your color to black, then open Paint > Set Vertex Colors. This will change the entire mesh vertex color to black, which is equivalent to no highlight.
Now set your color to hex #0080FF or so. This is the color we will be using to paint our highlights.
Paint the blue color roughly where you want the highlights to be.
Use the Blur tool to blur out the highlights as much as possible.
Go to Paint > Dirty Vertex Colors. This will smooth the color out a little more and reduce its intensity.
Repeat for all portions of your hair.
Export and load into game. You should now have working highlights on your hair. Feel free to go back into Blender and adjust if necessary.

Before adding vertex paint.

After adding vertex paint.

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