cam_pos      = [-0.736678, 1.38191, 0.298811]';
cam_dir      = [0.982766, -0.118153, 0.142162]';
cam_up       = [0.0900132, 0.977603, 0.190236]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.214735, 0.231635, -1.29195]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;