Using the learnings from vtkFollower, I realized this follower effect through a callback function for the active camera’s Modified event – each block’s data is updated. By this way, 1000 labels like simple triangle (for testing) has a good frame rate. When the number of labels comes to 5000, the frame rate drops down to 17 fps – a little lag could be felt. With a SMP parallel handling in the callback, the fps can be somehow improved.
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