Documentation / Node reference / geo nodes
Hollows out an SDF object into a shell.
Sdf Operations
Replaces each input SDF object's solid with a shell along its surface. `side` picks where the wall grows: BOTH straddles the surface, `thickness` on each side; OUTSIDE grows it outward by `thickness`, so the object's inside stays the hole; INSIDE grows it inward by `thickness`, so the outer silhouette does not change, which is what a casing or a cup wants. Where the object is thinner than `thickness`, an INSIDE wall fills it solid. The shell is CLOSED: to see inside it, cut it open with a geo/SDFBoolean subtraction, which is the usual way to get a cup or a bowl. Repeating the node nests shells inside one another. It works on 2D and 3D fields alike. Non-SDF objects pass through unchanged.
| Name | Type | What it does |
|---|---|---|
| thickness | Float | How far the wall reaches from the original surface, on each side it covers. With side BOTH the wall is twice this thick. |
| side | UInt8 BOTH · OUTSIDE · INSIDE | Which side of the original surface the wall grows on: BOTH straddles it, OUTSIDE grows outward and INSIDE grows inward, keeping the outer surface where it was. |
Scenes you can open in the editor that teach this node.
A hollow SDF shell broken into the Voronoi cells of points spread over it, drawn by raymarching with no meshing. On the left, every cell is a rounded piece. On the right, only the walls between the cells are kept. Change `roundingRadius` or `wallThickness` and the picture follows without remeshing.
geo/VoronoiField geo/SDFOnion geo/VoronoiNeighbours
This page is generated from the engine, so it describes the release you can download. The same text is in the editor's Help panel next to the node itself.
