johnmather
When you paint vertex colors in Maya, they are brought over into Houdini as Cd attributes. You can use these to drive your mask.
See here for all of the attributes that you can use: https://www.sidefx.com/docs/houdini/maya/mesh.html [www.sidefx.com]
So for example if i set the density to work on Cd.x and then paint the mesh in maya the asset should read it and scatter points accordingly?