Re: LODOffset and Virtual Clip Textures?

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Javier Castellar (javier++at++sixty.engr.sgi.com)
Mon, 8 Sep 1997 11:19:30 -0700

There is one simulator being delivered with 2Mx2M virtual clipmap as I write
this email.

-Javier

On Sep 8, 9:20am, Scott Brabson wrote:
> Subject: LODOffset and Virtual Clip Textures?
> Hello everyone,
>
> Last week I had asked questions regarding virtual cliptextures, what are
> they? No one responded, so I will try to clarify my question.
>
> Two parameters for a cliptexture, effective levels and LOD Offset, can
> be set during run time. Effective Levels can be set in the ct config
> file. Reading through the man pages and how a cliptexture is loaded it
> appears that for any texture larger than 32K by 32K the LOD Offset must
> be set. The following is an example of sample values
>
> IMAGE SIZE |Effective Levels |LOD Offset
> 32k x 32k 16 0
> 64k x 64k 16 1
> 128k x 128k 16 2
> ...
>
>
> Has anyone created cliptextures larger than 32K? Before I go out and
> create all of the imagery for a 128k x 128k, I would like to make sure
> this works! I created an empty 64K and 128K ic files and set the LOD
> Offset in my program. It does not die or even choke. Is this a
> sufficient test to see if the cliptextures are virtual and the 128K ic
> is being read?
>
> Thanks for any help,
> Scott Brabson
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>-- End of excerpt from Scott Brabson

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