ray sphere intersection equation
bool hit_sphere(const vec3& center, float radius, const ray& r){
vec3 oc = r.origin() - center;
float a = dot(r.direction(), r.direction());
float b = 2.0 * dot(oc, r.direction());
float c = dot(oc,oc) - radius*radius;
float discriminant = b*b - 4*a*c;
return (discriminant>0);
}ray sphere intersection equation
float hit_sphere(const vec3& center, float radius, const ray& r){
vec3 oc = r.origin() - center;
float a = dot(r.direction(), r.direction());
float b = 2.0 * dot(oc, r.direction());
float c = dot(oc,oc) - radius*radius;
float discriminant = b*b - 4*a*c;
if(discriminant < 0){
return -1.0;
}
else{
return (-b - sqrt(discriminant)) / (2.0*a);
}
}Copyright © 2021 Codeinu
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