Re: Alias/Mipmap

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Angus Dorbie (dorbie++at++multipass.engr.sgi.com)
Thu, 16 Oct 1997 17:10:38 -0700

On Oct 16, 2:28pm, Smith, James L. wrote:
> Subject: Alias/Mipmap
> SGI Info:
>
> I work with a group using SG's Onyx 2 /Reality Engine for real-time
> simulation at the Guided Weapons Evaluation Facility (GWEF) at Eglin AFB
> in Florida. Operating software uses IRIS Performer with IRIX.
> Questions arose when choosing the minification filter in Multigen for
> textured terrain. A bilinear, non-mipmapped scene showed considerable
> scintillation (alias) when moved. When they chose the "none" option, a
> scene without alias and quite good response time developed.
> The guys don't know what "none" is. They determine it selects
> Performer's default setting.
>
> Question: what is "default" regards filtering and mipmapping with the
> stated equipment. I feel default does mipmapping and at least point
> sampling. Your opinion?

This is trilinear MIP mapping ( LINEAR_MIPMAP_LINEAR in OpenGL)

Try explicitly selecting MIPMAP TRILINEAR on the GUI for the same results.

Cheers,Angus.
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