cam_pos      = [0.253358, 1.21683, -0.57633]';
cam_dir      = [-0.946198, -0.279778, 0.162583]';
cam_up       = [-0.277533, 0.96001, 0.036832]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.221293, 0.0136616, 1.31139]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;