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Colour sphere based on normal

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Camden Dixie O'Brien
2025-09-23 15:35:26 +01:00
parent 58e3a869bb
commit 0ea0c1edd2
1 changed files with 5 additions and 2 deletions
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7
demo.c
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@@ -59,8 +59,11 @@ static double intersect(sphere_t sphere, ray_t ray)
static vec3_t raycol(ray_t ray) static vec3_t raycol(ray_t ray)
{ {
const double t = intersect(obj, ray); const double t = intersect(obj, ray);
if (t > 0.0) if (t > 0.0) {
return red; const vec3_t p = vec3_add(ray.orig, vec3_scale(ray.dir, t));
const vec3_t normal = vec3_unit(vec3_sub(p, obj.centre));
return vec3_scale(vec3_add(normal, white), 0.5);
}
const double a = (ray.dir.y + 1.0) / 2.0; const double a = (ray.dir.y + 1.0) / 2.0;
return vec3_add(vec3_scale(lightblue, a), vec3_scale(white, 1 - a)); return vec3_add(vec3_scale(lightblue, a), vec3_scale(white, 1 - a));