I’ve been trying to recreate the Grease Pencil Line Art Modifier using Geometry Nodes. I’m pretty close, but I’m wondering: How do you delete vertices that aren’t seen by the camera? I’ve been trying to use the raycast node, but whenever I do, nothing happens. I’m specifically trying to remove the edges in the back of the model, so I can move the geometry nodes to be seen at the front without the back edges being seen. If I were to sum up the effect I’m trying to achieve in text: Send out raycast If not hit, delete vertice
My Mistake. While yours deletes the backfaces, I’m also looking to delete faces that aren’t backfaces, but still aren’t visible to the camera as the angle changes such as the ones behind the neck or hidden by the shoulders.
I tried using a boolean difference. When I tried using the boolean, it didn’t work, since the culling pulls from the original geometry, so for some reason it deletes all of the mesh.
What geometry would I need the boolean union for?
Also, is there a way to use the raycast node to check if a face is obstructed or inside another object? I’ve tried before, but none of my results have been successful.
