Raymarching SDF Shapes — Soft-Min Color Blends

[Tibi]

This project is a real‑time GPU raymarching experiment built with Three.js and a custom GLSL fragment shader. A full‑screen quad is rendered with a signed distance field (SDF) scene evaluated per‑pixel via sphere tracing. The scene contains three independently moving primitives—a sphere (red), a box (green), and an icosahedron (blue)—each drifting smoothly to seeded “random” X/Y positions over time. When objects overlap, both geometry and color blend smoothly using a soft‑minimum (log‑sum‑exp) distance combine, producing liquid-like merges instead of hard cutoffs. Shading is based on surface normals derived from SDF gradients, with a diffuse light term and an added Fresnel rim highlight to emphasize silhouettes. The camera uses aspect‑correct screen coordinates suitable for raymarching, and object rotation is applied as an inverse transform to keep the distance estimate stable.

Raymarching SDF Shapes — Soft-Min Color Blends