SDF Fillet Node

The SDF Fillet node smooths or rounds off concave internal corners in a Signed Distance Field (SDF) grid. It modifies the field to produce softer transitions between surfaces that meet at sharp inward angles, similar to adding a fillet or bevel in mesh modeling.

This operation only affects regions with negative principal curvature (concave corners) and preserves overall volume. The result is a more organic and continuous surface, useful for soft blending of intersecting shapes or removing hard transitions after boolean operations.

Inputs

Grid

The input SDF grid to be smoothed. Typically generated from another SDF operation such as a boolean or mesh conversion.

Iterations

The number of smoothing iterations to apply. Higher values produce a larger, smoother fillet radius but also increase computation time. A single iteration results in a subtle rounding, while multiple iterations create progressively softer surfaces.

Outputs

Grid

The resulting SDF grid with concave corners rounded off. The output can be visualized by converting it to a mesh with Grid to Mesh or used in further volumetric operations.