SDF normal

sdfnormal.txt

float3 calcNormal(in float3 pos) {

		float3 eps = float3(0.001, 0.0, 0.0);
		float3 nor = float3(
			map(pos + eps.xyy).x - map(pos - eps.xyy).x,
			map(pos + eps.yxy).x - map(pos - eps.yxy).x,
			map(pos + eps.yyx).x - map(pos - eps.yyx).x);
		return normalize(nor);
	}