)\\n );\\n}\\n\\nfn march(r: Ray) -> Hit {\\n var t: f32 = 0.0;\\n var scene: f32;\\n var p: vec3f;\\n\\n var material: Material;\\n\\n for (var i: u32 = 0; i < nRMSteps; i++) {\\n p = rAt(r, t);\\n scene = map(p, &material);\\n let uScene = abs(scene);\\n if (uScene < RMSurf || uScene > RMMiss) { break; }\\n t += uScene;\\n }\\n\\n let hit: bool = abs(scene) < RMMiss;\\n var out: Hit;\\n out.didHit = hit;\\n if (hit) {\\n out.norm = normal(p, scene);\\n out.pos = p;\\n out.depth = t;\\n out.material = material;\\n }\\n return out;\\n}\\n\\nfn sceneIntersect(r: Ray) -> Hit {\\n var close = Hit(false, vec3f(0), vec3f(0), 100000, Material(vec3f(0.0), vec3f(0.0), 0.0, 0.0, 0.0, 0.0, 0.0));\\n for (var i: u32 = 0; i < nSpheres; i++) {\\n let h = sphereIntersect(spheres[i], r);\\n if (h.didHit && h.depth < close.depth) { close = h; }\\n }\\n\\n let RMScene = march(r);\\n if ((RMScene.didHit && RMScene.depth < close.depth) || !close.didHit) {\\n close = RMScene;\\n }\\n\\n return close;\\n}\\n\\nfn trace(ray: Ray) -> vec3f {\\n var r = ray;\\n var color: vec3f = vec3f(1.0);\\n var light: vec3f = vec3f(0.0);\\n\\n var ior: f32 = 1.0;\\n\\n for (var bounce: u32 = 0; bounce < nBounces; bounce++) {\\n let h = sceneIntersect(r);\\n if (!h.didHit || dot(color, color) < 0.01*0.01) { break; } // could do skybox here\\n\\n // some hits reflect for \\\"shininess\\\"\\n if (hash13(h.pos) > h.material.specular-0.001) {\\n\\n var direct: vec3f = vec3f(0.0);\\n for (var lI: u32 = 0; lI < nLights; lI++) {\\n for (var r: u32 = 0; r < nShadowRays; r++) {\\n let l = lights[lI];\\n let inL = l.pos + l.radius*inUnit(h.pos*f32(r+1));\\n let toL = inL - h.pos;\\n let dstL = length(toL);\\n let falloff = 1.0 / dot(toL,toL); // inverse square law\\n let diffuse = max(0.0, dot(toL, h.norm) / dstL);\\n\\n let shadowR = Ray(h.pos+h.norm*0.001, toL/dstL);\\n let shadowH = sceneIntersect(shadowR);\\n var shadowT = 1.0f;\\n if (shadowH.didHit && shadowH.depth < dstL) { shadowT = 0.0; }\\n\\n direct += diffuse * falloff * l.color * l.strength * shadowT;\\n }\\n }\\n // TODO: make DLS work with <1 roughness\\n if (h.material.roughness >= 0.95 && h.material.refracted < 0.05) {\\n light += color * h.material.diffuse * (direct/f32(nShadowRays)); }\\n light += color * h.material.emission;\\n color *= h.material.diffuse;\\n\\n var material: Material;\\n let scene: f32 = map(h.pos, &material);\\n\\n r.origin = h.pos + h.norm*(5.0*RMSurf*sign(scene));\\n var d = normalize(inUnit(h.pos) + h.norm);\\n let re = reflect(r.direction, h.norm);\\n\\n var rd = mix(re, d, h.material.roughness);\\n if (hash13(h.pos*86.0) < h.material.refracted+0.001) {\\n let n = h.norm * sign(dot(h.norm, -r.direction));\\n var newIOR = h.material.ior;\\n if (dot(n, h.norm) < 0.0) {\\n newIOR = 1.0;\\n }\\n rd = refract(r.direction, n, ior/newIOR);\\n rd += h.material.roughness*normalize(inUnit(h.pos*323)+r.direction);\\n rd = normalize(rd);\\n ior = newIOR;\\n r.origin = h.pos - h.norm*(5.0*RMSurf*sign(scene));\\n }\\n r.direction = rd;\\n } else {\\n light += color * h.material.emission;\\n var material: Material;\\n let scene: f32 = map(h.pos, &material);\\n r.origin = h.pos + h.norm*(5.0*RMSurf*sign(scene));\\n let d = normalize(inUnit(h.pos) + h.norm);\\n

@compute.toys