cam_pos      = [0.207043, 1.99395, 0.0792646]';
cam_dir      = [0.433124, -0.387371, 0.813847]';
cam_up       = [-0.225912, 0.827458, 0.514078]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.16051, 0.540668, -0.36027]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;