[Radiance-general] mirror and mixfunc

[giulioandrea antonutto foi]

Unfortunately is no more online but I still have some of the entries.
I can probably make a PDF of these and send it to Andy for sharing with the community?
G.

> On 1 Dec 2015, at 17:11, Greg Ward <gregoryjward at gmail.com> wrote:
> 
> Thanks, Giulio, great stuff!  Do we have a link to your blog from radiance-online?  We should add one if we don't.  Is there an index of any kind?
> 
> Cheers,
> -Greg
> 
>> From: giulioandrea antonutto foi <geotrupes at me.com <mailto:geotrupes at me.com>>
>> Subject: Re: [Radiance-general] mirror and mixfunc
>> Date: December 1, 2015 8:57:52 AM PST
>> 
>> From my old blog….
>> 
>> The idea is to create a simple mirror, a ‘caustic’ effect and apply a pattern to it, to create holes without having to modify the geometry.
>> The geometry is a classic:
>> cap.rad - the cap for the ring
>> mix ring top
>> 0
>> 0
>> 8
>> 0 0 25
>> 0 0 1
>> 57.29432507 60
>> scene.rad - a spot light and a plane
>> void spotlight spot
>> 0
>> 0
>> 7 50000 50000 50000 35 0 -1 -1
>> spot sphere source
>> 0
>> 0
>> 4 0 200 200 2.5
>> void plastic white
>> 0
>> 0
>> 5 .5 .5 .5 0 0
>> white polygon plan
>> 0
>> 0
>> 12
>> -500 -500 0
>> -500 500 0
>> 500 500 0
>> 500 -500 0
>> single.rad - a single sector of the ring, to array
>> mix polygon int
>> 0
>> 0
>> 12
>> -.5 -57.29432507 0
>> -.5 -57.29432507 25
>> .5 -57.29432507 25
>> .5 -57.29432507 0
>> mix polygon ext
>> 0
>> 0
>> 12
>> -.5237120674 -60 0
>> .5237120674 -60 0
>> .5237120674 -60 25
>> -.5237120674 -60 25
>> And now the interesting stuff:
>> To activate secondary sources use -dr N  (N>0).
>> We will use mirror.
>> Unfortunately when mirror is nested into a mixfunc material is invisible to the secondary source tracer... but there is a workaround...
>> model.mat
>> #alterate the reflectance of the metal - optional
>> void brightfunc stripes
>> 2  'sin(A1*Pz)' . 
>> 0
>> 1 .8
>> #metal
>> stripes metal metal
>> 0
>> 0
>> 5 .8 .8 .8 0.001 0
>> #mix the metal with void to create holes
>> void mixfunc strip
>> 4  metal void 'if(sin(A1*Py),0,1)' .
>> 0
>> 1 .2
>> #alterate the reflectance of mirror, reflectance is 0% for holes
>> void brightfunc band
>> 2 'if(sin(A1*Py),0,1)' .
>> 0
>> 1 .2
>> #mirror attached to the metal surface, with holes
>> band mirror mix
>> 1 strip
>> 0
>> 3 1 1 1
>> 
>> 
>> Now, array the single.rad file:
>> xform -a 360 -rz 1 -i 1 single.rad  > ring.rad
>> 
>> ...
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