noteuclid/minitracing
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Make emission non-uniform

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Surface emission would be uniform so, let’s pretend it’s volume emission
This commit is contained in:
numzero 2024-12-30 16:46:35 +03:00
parent 96b5ac2200
commit b26800c070
1 changed files with 14 additions and 7 deletions
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13
src/bin/minitracer/trace.wgsl
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@ -69,8 +69,8 @@ fn to_sphere(center: vec3f, radius: f32, t: ptr<function, f32>) -> bool {
fn trace_fragment(in: Varying) -> vec3f { fn trace_fragment(in: Varying) -> vec3f {
seed(in.screen); seed(in.screen);
var result = vec3(0.0); var result = vec3(0.);
var color = vec3(1.0, 1.0, 1.0); var color = vec3(1.);
pos = params.eye; pos = params.eye;
let off_px = vec2(rand_float(), rand_float()) - .5; let off_px = vec2(rand_float(), rand_float()) - .5;
let off_w = mat2x3(dpdx(in.dir), dpdy(in.dir)); let off_w = mat2x3(dpdx(in.dir), dpdy(in.dir));
@ -94,11 +94,18 @@ fn trace_fragment(in: Varying) -> vec3f {
let s = spheres[sphere]; let s = spheres[sphere];
pos += t * ray; pos += t * ray;
let normal = (pos - s.center) / s.radius; let normal = (pos - s.center) / s.radius;
result += color * s.emit_color; if (all(s.emit_color == vec3(0.))) {
color *= s.reflect_color; color *= s.reflect_color;
let diffuse = normal + rand_sphere(); let diffuse = normal + rand_sphere();
let specular = reflect(ray, normal); let specular = reflect(ray, normal);
ray = normalize(mix(diffuse, specular, s.glossiness)); ray = normalize(mix(diffuse, specular, s.glossiness));
} else {
let d = dot(-ray, normal);
let strength = d * d; // it would be 1 for surface emission, but this models volume emission
result += color * s.emit_color * strength;
color *= (1. - strength);
pos += 1e-3 * ray;
}
if (length(color) < params.min_strength) { if (length(color) < params.min_strength) {
break; break;
} }