How do you tell if verts are inside of another mesh using geometry node and store them as boolean attribute? I tried the attribute Proximity node but it returns absolute distance to object so couldn't tell if the vertex is inside or outside the other mesh. Assume both mesh are manifold.
(Updated.. see below)
In Blender 3.0a, there's a Ray Cast node. So you can fire a ray in an arbitrary direction from each point in the modified geometry, seeking only the target geometry. Intervening objects are ignored. 'No hit' returns 0. If-and-only-if the source vertex is inside (a manifold) target, there will be a hit-point, whose normal is backfacing to the ray.
Update for GN Fields: