cam_pos      = [-0.467495, 1.99849, -0.066202]';
cam_dir      = [0.713827, -0.20981, 0.668155]';
cam_up       = [0.00524485, 0.955643, 0.294481]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.931403, 0.274916, -0.908741]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;