cam_pos      = [-0.0645841, 0.808677, 1.16328]';
cam_dir      = [0.805418, 0.541315, 0.241411]';
cam_up       = [-0.584938, 0.660208, 0.47114]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.127219, 0.692498, -1.12835]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;