cam_pos      = [0.522405, 1.49008, 0.272019]';
cam_dir      = [-0.732948, -0.0201234, -0.679987]';
cam_up       = [0.129674, 0.977102, -0.16869]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.888189, 0.281717, 0.949029]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;