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Simplify the ray-sphere intersection code

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This commit is contained in:
Jean-Michel Gorius 2022-11-10 22:17:22 +01:00
parent 647abd385d
commit 6352cbf0fd
1 changed files with 3 additions and 3 deletions
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6
main.c
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@ -10,13 +10,13 @@
double hit_sphere(point3 center, double radius, ray r) { double hit_sphere(point3 center, double radius, ray r) {
vec3 oc = point3_sub(r.origin, center); vec3 oc = point3_sub(r.origin, center);
double a = vec3_length2(r.direction); double a = vec3_length2(r.direction);
double b = 2 * vec3_dot(oc, r.direction); double half_b = vec3_dot(oc, r.direction);
double c = vec3_length2(oc) - radius * radius; double c = vec3_length2(oc) - radius * radius;
double discriminant = b * b - 4 * a * c; double discriminant = half_b * half_b - a * c;
if (discriminant < 0) if (discriminant < 0)
return -1.0; return -1.0;
else else
return (-b - sqrt(discriminant)) / (2.0 * a); return (-half_b - sqrt(discriminant)) / a;
} }
color ray_color(ray r) { color ray_color(ray r) {