Marching Cubes

Polygonise an SDF into a triangle Mesh. This is the explicit bridge between the implicit world (Sphere / Gyroid / Union / ...) and any node downstream that needs actual geometry (Mesh Boolean, Mesh Subdivide, Mesh Slice, Output → Mesh).

Node

Interactive preview is available in the interactive reader.

Sockets

sdf (in): SDF. Required.
center (in): Vector3. Centre of the sampling volume.
size (in): Vector3. Extent of the sampling volume (x, y, z full-extent).
resolution (in): Int. Cells along the longest axis.
isoLevel (in): Float. Iso-value to extract (typically 0 for proper SDFs).
mesh (out): Mesh.

Parameters

Center: Centre of the sampling box. Default: [0, 0, 0].
Size (xyz): Full extent of the sampling box along x, y, z. The box spans center ± size/2. Default: [40, 40, 40].
Resolution: Cells along the longest axis; shorter axes get proportionally fewer cells so cells stay roughly cubic. Default: 48. Range 4..256. Doubling this roughly 8× the work.
Iso level: Level set to extract. 0 for SDFs. Non-zero lets you shift gyroid-style pseudo-SDFs' wall thickness without re-authoring the field. Default: 0.

How It Works

Sample the SDF on a regular (nx+1) × (ny+1) × (nz+1) grid.
Classify each cell by the sign of its eight corners.
Look up the triangle pattern from the 256-entry Marching Cubes table.
Linearly interpolate each edge crossing to place the triangle vertex.
Feed the resulting positions + indices through makeMesh which also computes smooth normals.

Cancellation is checked once per Z slab — big resolutions abort cleanly when the user retriggers a generation.