cam_pos      = [-0.514507, 1.20512, 1.72235]';
cam_dir      = [0.977421, 0.187149, -0.0980984]';
cam_up       = [-0.170366, 0.972621, 0.158065]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.166242, 0.183251, -1.30678]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;