Add sphere intersection function

src/object.h

@@ -25,6 +25,8 @@ void object_destroy(Object *obj);
 Vector3 object_get_location(Object *obj);
 void object_set_location(Object *obj, Vector3 location);
 
+int object_does_intersect(Object *obj, Ray ray, float **t);
+
 // Sphere methods
 float object_sphere_get_radius(Object *obj);
 void object_sphere_set_radius(Object *obj, float r);