cam_pos      = [0.449714, 1.63907, 0.35762]';
cam_dir      = [0.544231, 0.25422, -0.79949]';
cam_up       = [-0.0899126, 0.965168, 0.245697]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.10936, 0.0822359, -0.729016]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;