[Geonodes]Check if a given position is inside the mesh(Solved)

[LordoftheFleas]

Compare the normal with the ray direction(dot product <0), It worked in this example:

Possible to use an object to select part of another object?

You can also use geometry nodes for this: Building on this outdated post: https://blender.stackexchange.com/questions/230921/find-out-if-vertices-are-inside-or-outside-of-another-mesh-using-geometry-nodes The plane has a vertex group “Group”, to which the geometry node setup writes. [image] [image] [image] After applying both modifiers [image] The vertex group will only contain the vertices inside the other mesh: [image] (The material assignment in the geometry select_inside.blend …