Function rayIntersectsSphere

src/math/index.ts:340–346

(ray: Ray, center: Vec3, radius: number)

}

export function rayIntersectsSphere(ray: Ray, center: Vec3, radius: number): boolean {
  const oc: Vec3 = { x: ray.position.x - center.x, y: ray.position.y - center.y, z: ray.position.z - center.z };
  const a = vec3Dot(ray.direction, ray.direction);
  const b = 2.0 * vec3Dot(oc, ray.direction);
  const c = vec3Dot(oc, oc) - radius * radius;
  return b * b - 4 * a * c >= 0;
}

export function checkCollisionSpheres(center1: Vec3, radius1: number, center2: Vec3, radius2: number): boolean {
  return vec3Distance(center1, center2) <= radius1 + radius2;