[Radiance-general] texfunc with -aa 0

[Stephen Wasilewski]

Hi Greg,

here is my cal file to simulate metal decking:

{
A1 = length of 1 period
A2 = angle of ribs (0-90)
A3 = bottom length
A4 = top length
}
angle = A2*DEGREE;

F1 = A3/A1;
F2 = (A1-A3-A4)/2/A1 + F1;
F3 = A4/A1 + F2;
inc = frac(Px/A1);
zcor = if(and(inc-F1,F2-inc),cos(-angle),if(inc-F3,cos(angle),0));
xcor = if(and(inc-F1,F2-inc),sin(-angle),if(inc-F3,sin(angle),0));
ycor = 0;

and here is the material I am applying:

void texfunc NS
6 xcor ycor zcor ./decking.cal -rz 14
0
4 .667 71.5673 .1808 .3186

NS plastic NSdeck
0
0
5 .8 .8 .8 0 0

here is the same scene with the geometry physically modeled, the pattern is
more prominent because of self shading, but I would expect to see something
like this because of the normal perturbation (even with the noise).
[image: Inline image 1]

and here is the scene run with higher settings (-ad 20000) to reduce the
noise (still no discernible texture):
[image: Inline image 3]

thanks,

Stephen Wasilewski
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On Tue, Nov 1, 2016 at 10:06 AM, Greg Ward <gregoryjward at gmail.com> wrote:

> Hi Stephen,
>
> I only now realize that I misread your initial post, thinking you were
> talking about the -ab setting rather than -aa.  Mea culpa.
>
> Are you sure the texture isn't just being masked by all the noise you get
> with -aa 0?  Is it indeed a texture rather than a pattern you have
> applied?  In either case, it should have some effect whatever your -aa
> setting.  If you increase the -ad setting and decrease the -lw setting to
> 1/(ad) accordingly, the noise should go down to where you may be able to
> discern the texture again.  Can you share what texture you are using,
> exactly?
>
> Cheers,
> -Greg
>
> *From: *Stephen Wasilewski <stephen at coolshadow.com>
>
> *Date: *November 1, 2016 9:53:12 AM PDT
>
>
> Hi Greg and Jon,
> This is an indirectly lit surface (a ceiling).  I am not seeing the same
> patterning I get with -aa >0.  In a small test scene, I see the normal
> pertubation if I apply a specularity to the material, but not if it is
> purely diffuse, images below are with a diffuse material.  In longer runs
> that clean up the noise I see the same lack of pattern:
>
> vwrays -ff -vf 1.vf -x 400 -y 400 | rtrace  `vwrays -d -vf 1.vf -x 400 -y
> 400` -ffc -n 8  -ab 3 -lr -4 -lw 1e-4 -ad 200 -as 0 -aa 0 -av .04 .04 .04
> test.oct > nocache.hdr:
>
> vwrays -ff -vf 1.vf -x 400 -y 400 | rtrace  `vwrays -d -vf 1.vf -x 400 -y
> 400` -ffc -n 8  -ab 3 -ar 300 -ad 500 -as 250 -aa .1 -av .04 .04 .04 -af
> cache.amb  test.oct > ambcache.hdr:
>
>
> 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
>
>>
>>
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>
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