Re: Viewing Volume

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John Rohlf (jrohlf++at++tubes)
Mon, 18 Dec 95 12:23:53 PST

>
>
> Hi Everyone:
>
> I'm trying to write some code to manipulate the viewing frustrum. I would
> like to pitch the near plane. Using the pfFrustNearFar() call always set
> the near plane perpendicular to the view location and direction.
>
> Is this possible?
>
>
> Eye
> +Z \
> | ------ Near
> | \
> | \
> | \
> +---------L----------------- +Y
> | \
> | ------------------ Far
> |
> |
> -Z
>
> ( L is what I'm looking at.)
>

        Use pfMakePerspFrust (or pfMakePerspChan) to make off-axis
frusta like the diagram above. pfFrustNearFar() doesn't really *set* the
near plane perpendicular to the view location and direction, rather the
distances you pass it are interpreted as if they are perpendicular to the
viewing plane.

         

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