void Camera::generateRay(glm::vec3 pos, Ray *r, glm::vec3 eye) {
glm::vec3 ray_vec(pos[0] - eye[0], pos[1] - eye[1], pos[2] - eye[2]);
float norm = glm::dot(ray_vec,ray_vec);
if (norm>0){
ray_vec /= glm::sqrt(norm);
}
Ray temp_ray(eye, ray_vec,.001,std::numeric_limits<float>::infinity(),1.0f);
*r = temp_ray;
}
void Camera::generate_rays(unsigned width, unsigned height,
std::vector<Ray> & rays)
{
float distance = ((width/2) / tan(fov_x_ * M_PI / 360));
for (int y = ((int)height/-2); y < (int)height/2; ++y)
{
for (int x = ((int)width/-2); x < (int)width/2; ++x)
{
glm::vec3 direction(x, y, -(distance));
//Scale Camera if not default
if (eye_.x != 0 || eye_.y != 0 || eye_.z != 0 ||
dir_.x != 0 || dir_.y != 0 || dir_.z != -1 ||
up_.x != 0 || up_.y != 1 || up_.z != 0 )
{
glm::vec4 direct_temp(x, y, -(distance), 1);
glm::vec3 u = glm::normalize(glm::cross(dir_, up_));
glm::vec3 v = glm::normalize(glm::cross(u, dir_));
dir_ = glm::normalize(dir_);
// Matrix is implemented column x row
glm::mat4 matrix(u.x, u.y, u.z, 0,
v.x, v.y, v.z, 0,
(dir_.x*-1), (dir_.y*-1), (dir_.z*-1),0,
eye_.x, eye_.y, eye_.z, 1);
// Matrix x Vector
glm::vec4 new_direct = matrix * direct_temp;
direction.x = new_direct.x;
direction.y = new_direct.y;
direction.z = new_direct.z;
}
Ray temp_ray(eye_, direction);
rays.push_back(temp_ray);
}
}
}
