void Camera::LookAt(Vector3 target, Vector3 up)
{
view = Matrix::CreateLookAt(position, target, up);
Matrix temp = view.Transpose();
right = temp.Right();
this->up = temp.Up();
forward = temp.Forward();
}
Ray Raytracer::GetRay(int _x, int _y) const
{
float fovx = M_PI * m_FOV / 180; //Horizontal FOV
float fovy = M_PI * 55 / 180; //Vertical FOV (hard coded to 55)
float halfWidth = m_Width/2;
float halfHeight = m_Height/2;
float alpha = tanf(fovx / 2)*((_x - halfWidth) / halfWidth) + ((float)rand() / RAND_MAX - 0.5f) * 0.01f; //horizontal offset
float beta = tanf(fovy / 2)*((halfHeight - _y) / halfHeight) + ((float)rand() / RAND_MAX - 0.5f) * 0.01f; //vertical offset
Matrix viewMatrix = m_pCamera->GetViewMatrix();
Vector3 pos = viewMatrix.Translation();
Vector3 dir = alpha * viewMatrix.Right() + beta * viewMatrix.Up() + viewMatrix.Forward();
dir.Normalize();
return Ray(pos, dir);
}