is_ego_motion is False, rendering one frame

[obk0515]

I want the ago-vehicle can move. But when I run the code, it output:

is_ego_motion is False, rendering one frame

In chatsim/scene.py line 89:

        self.current_extrinsics = self.nerf_motion_extrinsics[3:4]  # use the second frame because it is in the training set. Better visualization
        self.current_extrinsics = self.current_extrinsics.repeat(self.frames, axis=0)

How can I make is_ego_motion is True.