Does SpeedTree write to Vertex Alpha?

SpeedTree
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1

I’m trying to write AO to Vertex Alpha, cause I use RGB for custom wind packing, but in Unity Vertex Color Alpha always 1. Does SpeedTree even support vertex alpha?

2

I’ve tried to export AO with newly crated tree in SpeedTree 10, and that’s what I get in Unity.
AO in RGB looks ok, but in Alpha it is weird
RGB | Alpha

Unity_XlfEedMUf7
Unity_XlfEedMUf71294×1023 179 KB
Unity_TkBLDahDd8
Unity_TkBLDahDd81294×1023 54.8 KB

SpeedTree_Modeler_Vd4oir8B4f
SpeedTree_Modeler_Vd4oir8B4f471×293 5.54 KB

3

Hi @TimNedvyga,

If you’re using ST or ST9, you’re only going to get RGB to play with. The vertex color alpha is used for branch blending, which you’re looking at in the Alpha screenshot. The branch blend value is used to blend the little bits at the base of a branch to match the trunk.

Thanks for your question!