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

[David Geisler-Moroder]

Hi Niko,

if you are using the light modifier, it seems you are reaching the maximum
number of 64 source subdivisions (set in source.h). For these cases I would
suggest to follow Guilio's proposal and use the glow modifier instead and
work on the parameters to properly handle rendering time.

Best,
David

2015-03-09 23:15 GMT+01:00 Greg Ward <gregoryjward at gmail.com>:

> 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
>
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