[Radiance-general] texfunc with -aa 0

[Jon Sargent]

Barring Greg's low-ab hypothesis, is it possible the "expected" texture you
see with -aa > 0 is really an interpolation artifact?

In my experience textfuncs should reveal themselves @ -aa 0.  E.g.,

shiny linoleum floor, perfectly smooth:


​

shiny linoleum floor, with wave and microbump texfunc modifiers:


​
​
(Both with -ab 2).

Jon

On Mon, Oct 31, 2016 at 4:26 PM, Greg Ward <gregoryjward at gmail.com> wrote:

> Hi Stephen,
>
> A texfunc perturbs the surface normal, which should be visible at least in
> directly lit areas with -ab 0.  Are you saying that you have directly lit
> surfaces that look flat with a texfunc applied?  That would be unexpected.
>
> In the shadows, there is nothing for a perturbation in the surface normal
> to affect, so everything looks the same as it would without the texfunc.
> With -ab 1, you see variation again, as the surface normal influences the
> shading of the indirect component.
>
> -Greg
>
> *From: *Stephen Wasilewski <stephen at coolshadow.com>
>
> *Date: *October 31, 2016 4:08:52 PM PDT
>
>
> Does anyone know why a texfunc has no effect on the material it modifies
> with -aa 0?  The same material/geometry/octree appear as expected with -aa
> > 0.
>
> Thanks,
>
> Stephen Wasilewski
> *LOISOS *+* UBBELOHDE*
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> 1917 Clement Avenue  Building 10A
> Alameda, CA  94501 USA
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> 510 521 3800 VOICE
> 510 521 3820 FAX
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> www.coolshadow.com
>
>
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20161031/b30f99d4/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: MatTest_1_1_12.00_ClearSkyWithSun.jpg
Type: image/jpeg
Size: 60362 bytes
Desc: not available
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20161031/b30f99d4/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: notex_1_1_12.00_ClearSkyWithSun.jpg
Type: image/jpeg
Size: 60574 bytes
Desc: not available
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20161031/b30f99d4/attachment-0003.jpg>