3D SDF Shapes

Sphere

A sphere has a single parameter r, which is the radius of the sphere.

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float sdSphere(in vec3 p, float r) {
    return length(p) - r;
}

A box has three parameters, which are stored in a vec3. These are used to define the width, length, and height of the box.

float sdBox( vec3 p, vec3 b )
{
  vec3 q = abs(p) - b;
  return length(max(q,0.0)) + min(max(q.x,max(q.y,q.z)),0.0);
}