[vtkusers] About camera.setParallelProjection(true) in vtk.js

[Feng Yang]

Hi Sir.
        I'm doing medical imaging volume rendering with vtk.js in my
application.
        And I have a problem here.
        Before camera.setParallelProjection(true), everything looks fine.
the result is ok.
        but After   camera.setParallelProjection(true) , Nothing is shown.
        Why is that. Am I missing something here.

thanks.
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