Tutorial 13: SDF Smooth Blend Sculpture

Chain SDF Sphere and SDF Torus with SDF Union (non-zero smoothness for fillet-like blends), then SDF Subtract with an SDF Box to carve—Quilez-style CSG art in the SDF graph.

Blended organic SDF shape from union and subtract preview

What you'll learn

smin-style smoothness on Union and Subtract
Placing centers and radii in 3D for composition
Marching Cubes domain size to frame the sculpture

Prerequisites

Tutorial 11 (marching cubes workflow)

Step 1: Union then subtract

Step 1

Sphere + Torus → Union → Box subtract

Build Sphere and Torus SDFs; Union with smoothness ~4–5. Subtract the Box SDF from the union (watch center / size so the box actually cuts into the blend). Route the result to Marching Cubes and then Output Preview mesh.

Outcome

Abstract printable art with soft transitions—hard to match with triangle Mesh Boolean alone.

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What’s Next

Tutorial 14: Adaptive Textured Print — Adaptive Layers, Flow Modulate, Seam Shift, Travel Optimize.