​Hello,

I'm writing a custom CameraOp node has been sub-classed to provide camera
animation from a proprietary file format.   I'm reading the data and
setting the internal members for the projection parameters but I can't
figure out is how to display the values back as knobs in the UI similar the
standard nuke camera.

Is there a way to either subclass the nuke camera node so all the knobs for
the projection parameters are already created?   I tried creating knobs the
the CameraOp::projection_knobs and tying the internal member values to
those knobs but the callback never seems to be called.

   Thanks,

       Eric
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