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);
}

Source: viclw17.github.io

Similar codes

1 vote308 views1 answer
C++ check if string contains non alphanumeric
C++
1 vote289 views1 answer
Qt popup window
C++
7 votes319 views1 answer
C++ create class from class name
C++
75 votes392 views6 answers
Conda list envs
C++
0 vote324 views1 answer
C++ declare binary number
C++
481 votes461 views10 answers
December global holidays
C++
0 vote339 views1 answer
1162261467
C++
2 votes329 views1 answer
C++ lambda thread example
C++
1 vote321 views1 answer
Double to float c++
C++
-2 votes347 views4 answers
Memset function in C++
C++