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

[Greg Ward]

Hi Niko,

It is difficult to understand what is going on with your scene based on your description.  Can you post the actual scene (with light source), plus with the rpict command you used to generate the image?

Thanks!
-Greg

> From: giulioandrea antonutto foi <geotrupes at me.com>
> Subject: Re: [Radiance-general] Rendering of a transparent texture usinf colorpict
> Date: March 9, 2015 2:34:09 PM PDT
> 
> 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