Re: [info-performer] texture quality

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From: Angus Dorbie (dorbie++at++sgi.com)
Date: 03/27/2000 13:10:13

This drop off is due to mip mapping.

You can improve quality by selecting linear_mipmap_linear filtering,
right now you have linear_mipmap_nearest, or nearest_mipmap_linear, I
forget which. This is also known by it's IrisGL nomenclature of
trilinear mipmapping. So set the pfTexture minfilter to
PFTEX_MIPMAP_TRILINEAR.

Quality will still drop off but it will do so smoothly. Alternatively
you can select simple bilinear minification and you'll see aliasing
instead of the lower resolution filtering.

Cheers,ANgus.

ross::barna wrote:
>
> i am doing some detailed texture mapping (readable text and stuff) under
> pfLinux. i am wondering why there is an texture quality drop-off that
> appears to depend on distance from texture and window size. also, i would
> like to know if i can turn this off and render the entire texture in the
> same quality. is the artifact that is in the included image a feature of
> MipMapping?
>
> i want the highest fidelity renderings of the texture as possible.
>
> thanks,
>
> ross
>
> ------------------------------------------------------------------------
> Name: journalImage04.jpg
> journalImage04.jpg Type: JPEG Image (IMAGE/jpeg)
> Encoding: BASE64 

-- 
For Performer+OpenGL tutorials http://www.dorbie.com/

"In the middle of difficulty lies opportunity." 
 --Albert Einstein

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