cam_pos      = [0.492199, 1.50268, 0.305982]';
cam_dir      = [-0.582511, 0.447225, -0.678728]';
cam_up       = [0.614623, 0.788783, -0.00775166]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.70743, 0.56083, 0.976684]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;