sdfCapsule

fn sdfCapsule(position: vec3<f32>, radius: f32, height: f32) -> f32 {
  let d = abs(length(position.xz)) - radius;
  let p = vec2<f32>(d, abs(position.y) - height * 0.5);
  return length(max(p, vec2<f32>(0.0))) + min(max(p.x, p.y), 0.0) - radius;
}