Ray marching in GLSL

Ray marching draws 3D with distances. For every pixel a ray steps forward until it touches a shape. You go from one ray to a lit scene with normals, shadows and materials.

1. The rayA camera, one ray per pixel. The sky is its direction.
2. The sphereAn SDF: a formula that measures how far the surface is.
3. The marchThe ray takes safe steps. Here you see how hard it works.
4. NormalsWhich way the surface faces. The orientation map.
5. LightDiffuse: the face looking at the light lights up.
6. The floorA plane + min(). Two shapes share one scene.
7. ShadowA second ray toward the light. If it hits, shadow.
8. Two shapessmin(): two spheres melting into one.
9. MaterialColor by position + a sharp specular highlight.
10. Full sceneEverything together + the light orbits with time. FINALE.

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