40 lines
1.0 KiB
GLSL
40 lines
1.0 KiB
GLSL
void intersectSphere(Ray ray, inout RayHit bestHit, Sphere sphere)
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{
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vec3 c = sphere.cr.xyz;
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float r = sphere.cr.w;
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vec3 d = ray.origin-c;
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float p1 = -dot(ray.direction,d);
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float p2sqr = p1*p1-dot(d,d)+r*r;
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if (p2sqr < 0) return;
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float p2 = sqrt(p2sqr);
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float t = p1-p2 > 0 ? p1-p2 : p1+p2;
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if (t > 0 && t < bestHit.distance)
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{
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bestHit.distance = t;
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bestHit.position = ray.origin + t * ray.direction;
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bestHit.normal = normalize(bestHit.position-c);
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bestHit.albedo = sphere.albedo;
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}
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}
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void intersectPlane(Ray ray, inout RayHit bestHit, vec3 p, vec3 normal)
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{
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//normal = vec3(0.0,0.0,1.0);
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float denom = dot(normal, ray.direction);
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if (abs(denom) > 0.0001)
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{
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float t = dot(p-ray.origin, normal) / denom;
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if (t >= 0 && t < bestHit.distance)
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{
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bestHit.distance = t;
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bestHit.position = ray.origin + t*ray.direction;
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bestHit.normal = normal;
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bestHit.albedo = vec3(1.0,1.0,1.0);
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}
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}
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}
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