cam_pos      = [0.182491, 1.03314, 0.663257]';
cam_dir      = [0.568982, 0.411289, -0.71211]';
cam_up       = [-0.803021, 0.0912403, -0.588925]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.235736, -1.20621, -0.50831]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;