The MODIFY tab contains components used to alter, combine, texture, and structurally enrich existing geometry. These tools operate mainly on FRep and Mesh representations and are used to refine shapes, add details, or generate complex internal and surface structures.

Boolean Operations (FRep)

Combines two FRep bodies. Unlike CAD Booleans, these never fail on complex or self-intersecting input, which is why they are the workhorse for generative results.

Inputs

• FRep 1 / FRep 2 — The two bodies. For Subtract, FRep 2 is removed from FRep 1, so the order matters.
• Booleans (default Union) — Union keeps both, Intersect keeps only the overlap, Subtract removes the second from the first.
• Smooth scale (mm — default 0) — Fillet radius at the junction between the two bodies. At 0 the junction is sharp. Raising it creates a smooth, fillet-like transition — a fillet on a Union, a rounded relief on a Subtract. Same idea as the Blend Radius found in Topological Enclosure, Topology Weaving, Lightweighting and TO Post Process.

Outputs

• FRep out: The combined body.

Tips

• Use Smooth scale instead of adding fillets later: it costs nothing and removes the stress concentration at the junction.
• The fillet is sampled at the resolution set on Compute 3D Model. A 0.5 mm blend at Coarse resolution will look faceted — raise the resolution to resolve it.
• Booleans against the original functional regions are the reliable way to keep CAD-sharp edges on a generated part.

Mesh Boolean

Combines two or more Mesh bodies directly, without converting them first. Faster and exact where it works, but it needs clean watertight input — use Boolean Operations (FRep) when the meshes are messy or self-intersecting.

Inputs

• Meshes — Two or more meshes. Connect several inputs to the same port. For Subtract, the first connected mesh is the one kept.