Image Compositing vs. SDF Composition
Correspondence between Image Compositing and SDF Composition
Combination Type Image Processing Analogy SDF Operation Meaning / Result
Union (set union) OR — max (the brighter value wins) min(d1, d2) Inside if a point belongs to either shape; shapes add together.
Intersection (set intersection) AND — min (the darker value wins) max(d1, d2) Only the overlap remains; inside only if in both shapes.
Difference (A − B) A AND (NOT B) max(d1, -d2) Carves shape B out of shape A.
Smooth Union / Intersection Blur-like soft blending of boundaries Blending function (e.g., opSmoothU(d1, d2, k)) Boundaries are smoothly merged instead of hard CSG seams.
Metaballs / Field Summation Additive blending (sum fields/intensities) f(d1) + f(d2) (field sum → iso-surface) Shapes melt into each other where fields overlap.

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