cam_pos      = [0.646571, 1.44601, 1.28192]';
cam_dir      = [-0.299436, -0.112513, 0.947459]';
cam_up       = [-0.0729009, 0.992818, 0.0948596]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.26526, 0.054086, 0.406299]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;