Re: Flimmering

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Tue, 13 Aug 1996 17:30:22 +0100

On Aug 13, 6:20am, Michael T. Jones wrote:
> Subject: re: Flimmering
> Marcus Barnes wrote:
>
> :Any reason why the PFDECAL_BASE_STENCIL isn't costly on iR, are you just
> :referring to the stencil overhead and not the multipass on the base
> :polygons?

No he didn't :-)

>
> InfiniteReality supports a 1-bit stencil with only a 5% reduction in
> fill rate, which is considerably better than RealityEngine's 50% drop
> for stencil-enabled fill. These rates apply to both base and layer
> geometry.
>
> As always, stenciling implies somewhat less efficiency in mode
> sorting, since the order of base and layer can not be changed
> by the cull process. (i.e., you can't draw all the runways and
> then all the stripes as you might expect to happen when the
> displace style of coplanarity is in use).

OK, but don't you also have the overhead of drawing the base polygon more
than once for the subface stencil algorithm making this approach expensive.

Have I missed a trick here or does this overhead exist?

Thanks,
Angus.
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