If you look a the code you will recognize that the volume data will be put as
textures on planes parallel to the x-y, y-z and x-z planes. Depending on your
viewpoint the textures will be showed along the x, y, or z axes using the
planes parallel to the y-z, x-z or x-y planes respectively. The change of axes
when your viewpoint changes is what you describe as flip. You can see the
difference how the image is rendered if you uncheck the double buffer checkbox.
So there is no bug in the code, it's just an effect of this volume rendering
method.
regards
Paul
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