cam_pos      = [-0.8159, 1.3049, -0.170898]';
cam_dir      = [0.109142, 0.160471, 0.980988]';
cam_up       = [0.501454, 0.843217, -0.193725]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.1415, -0.682375, -0.0153773]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;