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Vertex alpha painting
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I created a patch which enables editing the alpha channel of vertex colors in the vertex paint mode. For this I had to extend the MeshColor and MeshLoopColor to four channels to store alpha values. Then I introduced another blend mode (set alpha) to the vertex paint editor. I used Brush.alpha (which is also used for intensity and pen pressure I guess) for setting the alpha values instead of extending Brush.rgb to Brush.rgba which I tried first but noticed it was too much trouble.
I implemented OpenGL rendering for solid and textured shading for immediate and VBO mode. But because of transparency I still need to sort the triangles depending on the view. Does functionality already exists which I could use for that?

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Fabio Arnold (donfabio) raised the priority of this task from to 90.
Fabio Arnold (donfabio) updated the task description. (Show Details)
Fabio Arnold (donfabio) edited a custom field.
Julian Eisel (Severin) lowered the priority of this task from 90 to Normal.Nov 24 2014, 5:54 PM

I would love to see this in master it would help a lot in my current project.

Please merge it.

Campbell Barton (campbellbarton) changed the task status from Unknown Status to Unknown Status.Feb 25 2015, 12:38 PM

Prefer not to keep both task & diff open unless there is really need for design-discussion / code-review separation.

In this case prefer to keep discussion in the differential.