I'm diving into geometry nodes today using 3.1 Alpha.
At this point I used Distribute Points on Faces and connected the Density Factor to a vertex group so I can use Weight Paint to change the value. But, here is the problem: my object will stay blue - the weight paint does not effect my object.
Part of the problem I solved already: I bypassed the Group Input's Geometry-node and used a Curve Primitive. During the Weight Paint I tried somethings and I see it only would paint the 'original' Geometry and not the geometry made from this Curve Primitive.
How can I make this work? Is there a node so I can 'convert' this into a geometry I can paint on? I attached a simplified illustration of my problem.