cam_pos      = [-0.507337, 1.08477, 0.955299]';
cam_dir      = [0.932901, 0.0251578, -0.359252]';
cam_up       = [-0.0836148, 0.985428, -0.148122]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.465887, -0.223735, -1.22548]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;