[Radiance-general] Rendering of a transparent texture usinf colorpict

[giulioandrea antonutto foi]

not sure it is the issue you have but if you use an image to light and this has multiple colour and it is a glow is very difficult to avoid splotches.
you get better results with -aa 0 (at a cost time wise) or by running a Greg script that converts an image in a series of light sources (look for sky imaging lighting)
Hope this helps
G>

On 7 Mar 2015, at 11:15, Niko Planke <plankovski at gmail.com> wrote:

> Hey i am right now trying to visualize a TV screen in radiance. For a
> better visual impression i have created an Imaging layer using the
> colorpict material.
> looking like this:
> 
> void colorpict imagin_layer
> 9 red green blue forestfl.pic . frac(U) frac(V) -s 2
> 0
> 0
> 
> imagin_layer trans image
> 0
> 0
> 7 1 1 1 0 0 1 0
> 
> when this is rendered the material is divided into small samples giving an
> odd pattern.
> here a picture of the rendering:
> http://api.ning.com/files/7F975s5rOKhNOb-MzrDw-IgT*9VAIHqtJ-jdmmewN42*lfsh9FDJX2BIr5Chxy1EG5VXoec5toLZlOaGexMtx8LzXqDF9y3t/Test_lightsource_highres_4096_.15_1024_2.bmp
> 
> This is a picture rendering using the standard settings for the high
> resolution rendering in diva, except for -ad 4096 -ds 0.15 and -as 1024.
> The setup is one imported light source behind the transparent colorpict
> material.  I have already tried using the ds/dj parameters without luck,
> the subdivision seams fixed. Also changing the -n parameter when creating
> the .oct file has not worked.
> 
> I have tried various combinations of -ad -as -ds -dj and -ps until now.
> i hope someone can help.
> 
> Niko
> 
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