Re: Configuring framebuffer.

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Angus Dorbie (dorbie++at++sgi.com)
Fri, 24 Sep 1999 15:55:09 -0700

Create two channels, one for near and one for far. Draw the near channel
after the far channel after clearing the depth buffer and set it's far
just a little further that the far channels near. This will allow you to
push the near clip a lot further out on the distant channel and just add
a few objects and mayve the near ocean skin to the near channel.

CHeers,Angus.

phowe++at++csc.com wrote:
>
> Hi,
>
> We are writing a periscope simulation and are currently having problems with Z
> fighting.
> We are running on an InfiniteReality2 with 1 RM9 Raster Manager and are drawing
> to
> two displays which both use the same area of the framebuffer ( one virtual
> binoculars
> 1280x1024 180Hz field sequential, the other is a standard monitor 1280x1024 60Hz
> ).
> For the application we need to use an accumulation buffer. The visual that fits
> our
> needs best is the following ( from findvis). We are using Medium pixel depth
>
> 0x6b, RGBA 12/12/12/12, db, Z 16, accum 25/25/25/25, samples 4
>
> Unfortunately that only gives us 16 bits for the Z buffer, and due to the
> application
> we need to have the near clip plane at 1m at the far clip plane at 50,000m.
>
> Is there a way we can change the framebuffer configuration to reduce the number
> of
> bits per component in the accumulation buffer and use them to increase the bits
> in the
> Z buffer?
>
> Any help would be greatly appreciated.
>
> Peter
>
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