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Trying to Control Growth of Tree Objects on a Mountain

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Hi Doc - 

I have a mountain object and I’d like to grow trees only on specific parts of the mountain.  I have those parts isolated (via white on black) in a 4K texture map that I exported from Gaea and am using in the Redshift shader graph for applying materials.  Is there a way to turn this texture map into a polygon selection that is associated with the mountain object?

I am not 100% sure that the texture map that I exported from Gaea will work until I experiment with it.  In case it doesn’t get the job done, is there a non-texture map method for controlling precisely where objects grow on a detailed sloped surface (without having to manually paint a selection or vertex map)?

I have a scene file that I can share if it will help.  It’s about 500 MBs.

Thanks for your help!


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