Don't you get this capability for free in Compatibility Mode?  In the
perspective view, you get the projection Transform3D by feeding
perspective() a frustum just outside your semi-transparent box, and for the
orthographic projections, by feeding ortho() a Viewing Volume just inside
it?

I haven't tried this, much less made it work, so I'm speculating.

Cheers,
Fred Klingener

> I have 3 orthographic views showing objects, and a single perspective view
> that show the objects.  All views are independant of each other.
> (actually, the 3 orthographic views are tied together to form
> top/front/left views).
>
> I would like to be able to show the viewing volume of the 3 ortho views
> within the perspective view.  That is, I want to put a semi-transparent
> box in the perspective view (it will correspond to the viewing volume of
> the ortho views), but NOT in the orthographic views.
>
> Does anyone out there know if it is possible to add objects/shapes to the
> scene from only a particular view??

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