SDF Grid Boolean Node

The SDF Grid Boolean node performs boolean operations between two or more Signed Distance Field (SDF) grids. This allows combining, subtracting, or intersecting volumetric shapes directly in grid space, similar to mesh boolean operations but with smooth and continuous results.

The node computes the resulting signed distance field by applying mathematical operations to the input grids, preserving the SDF property where each voxel stores the shortest distance to the nearest surface. This makes it useful for blending or sculpting complex volumes procedurally.

Inputs

Grid Intersect

The input grid used for intersection operations. Only the regions common to all intersecting grids will remain active.

Grid 1 Union Difference

The first input grid for boolean combination. Acts as the base grid to which the second grid is added or subtracted.

Grid 2 Union Difference

The second input grid used to modify Grid 1 according to the selected operation.

Properties

Operation

The boolean operation to perform between the input SDF grids:

Intersect:

Keeps only the overlapping region of the two grids where both contain interior (negative) values.

Union:

Combines both grids by taking the minimum distance at each voxel. The resulting grid contains the merged shape of both inputs.

Difference:

Subtracts the second grid from the first by inverting its sign and then taking the maximum distance. Useful for cutting holes or carving one SDF out of another.

Outputs

Grid

The resulting SDF grid after the boolean operation is applied. The output maintains valid signed distance values and can be converted to a mesh using the Grid to Mesh node or used in further volumetric operations.