Joins two distance fields with Union, Subtract, Intersect, XOR, Morph, and seam shapes, in hard, smooth, round, chamfer, stairs, or columns blends.

SDF Combine takes two fields, A and B, and outputs one. The boolean happens in the field itself, so the seam is exact and can be blended, stepped, or lit.

SDF Combine

Nine Mode operations, six Blend styles for the three booleans
Edge Glow lights the seam, with an Edge Color texture input
Found under SDF → Model in the operators panel; type smooth union or stairs subtract in the Tab search to place one pre-set

Example patch — drag onto the app to load

The image on the right is the example patch itself. Drag and drop it onto the app, or load it with File → Load, to open the full graph. A Box is subtracted from a Sphere with a Stairs blend and a glowing edge.

Inputs and outputs

SDF Combine node

Port	Type	Purpose
A	SDF	The first field. For Subtract, this is the shape that gets cut.
B	SDF	The second field. For Subtract, this is the cutter.
Edge Color	Texture	Optional. A gradient or image sampled across the glow band, from the seam centre to the band rim, tinted by Edge Color. Unwired, the glow is the flat colour.
SDF	SDF	The combined field. Chain it into another Combine to build up a model.

SDF Field outputs are filtered out of A and B. A field has to go through SDF Convert in Field to Solid mode first.

Parameters

Mode — default Union.
- Union, Subtract, Intersect — the booleans. These three use the Blend controls below.
- XOR — keeps what is in exactly one of the two shapes.
- Morph — interpolates between A and B. Morph (0–1, default 0.5) is the mix; animate it to melt one shape into the other.
- Pipe — a tube along the seam. Radius (default 0.12).
- Engrave — cuts B's outline into A's surface. Depth (default 0.08).
- Groove — a channel along the seam. Depth (default 0.1), Width (default 0.15).
- Tongue — a raised bead along the seam. Height (default 0.1), Width (default 0.15).
Blend — how the booleans meet. Default Smooth. Hard is a plain min/max; Smooth and Round soften the seam; Chamfer cuts a flat bevel; Stairs and Columns shape the seam into repeated steps or ridges.
Blend Amount (0.005–2, default 0.25) — the size of the blend zone.
Steps (1–16, default 4) — step count for Stairs and Columns.
Step Offset (−4 to 4, default 0) — slides the step pattern along the seam in whole steps, so a ramp from 0 to 1 loops without a jump.
Swap Inputs (default off) — reverses A and B before combining. Use it on Subtract to cut A out of B instead.
Edge Glow (0–8, default 0) — emissive highlight at the seam. 0 is off.
Edge Color (default #66ccff), Edge Width (0.005–0.5, default 0.08).
Edge Offset (0–10, default 0) — moves the glow band away from the exact seam.
Edge Repeat (0–24, default 0) — repeats the band as a family of contours. With Repeat above 0, animating Edge Offset scrolls the bands without end.

Every float has a per-parameter animation bar. See Parameters and Controls.

Examples

Bolt head — Cylinder into A, Hex Prism into B, Mode Intersect, Blend Chamfer.

Melting — two different primitives, Mode Morph, animate Morph with a slow LFO.

Scanning seam — any union with Edge Glow 2, Edge Repeat 6, and Edge Offset animated from 0 to 1.

Troubleshooting

Subtract removes the wrong shape. A is cut by B. Turn on Swap Inputs, or swap the wires.

The blend controls are missing — they only show for Union, Subtract, and Intersect. The other modes carry their own size controls.

Edge Glow does nothing — it applies only to the three boolean modes, and it needs the two shapes to touch. Raise Edge Width if the band is too thin to see.

SDF Primitive

The shapes you combine.

SDF Effector

Warp, repeat, and mirror the result.