What I did : I tried paint sop to store vertex colors however it cross over to other faces. So my question, how to paint vertex colors and get hard edge? I hope I can get my point across(English is not my native language)
The Paint SOP only knows about points when painting even though it will use vertex colors if they were previously created. See the attached file for a workaround. It first uniques the points of the input geometry to feed into the Paint SOP, then it copies the vertex colors from the uniqued geometry back to the original geometry. To use it, you can select the paint sop in the network pane, then move your mouse into the scene view pane and hit Enter. This will simulate vertex color painting.
