[Radiance-general] Removing black areas in imagemapping

Tue Jan 12 10:39:10 PST 2010

Hi Per,

You have two workplane polygons in your scene, one with material fc_glow and
one with material mp.  The blotches are a result of radiance using the
mixpict polygon for some rays and the false color polygon for others.
Remove the polygon with material fc_glow from your scene and your problem
should be solved.

Andy

On 1/12/10 1:09 AM, "Per Haugaard" <perhaugaard at yahoo.dk> wrote:

> Hi Andrew,
> 
> Thank you for your reply. Nothing happens when I play with the FTINY. The
> image remains the same if I remove FTINY and also if I change the expecting
> rounding error to 2e-3 or larger. I guess the error might be elsewhere.
> 
> Below you will find the input for the illum and falsecolor image.
> 
> # calculating illumince values on a virtual plan using vwrays
> vwrays -x 600 -y 600 -vf views/kontor_ned.vp \
> | rcalc -e '$1=$1; $2=$2; $3=0.8; $4=$4; $5=$5; $6=1' \
> | rtrace -ab 3 -aa 0.1 -ar 128 -ad 512 -as 256 -fac -w -I -ov `vwrays -d -vf
> views/kontor_ned.vp -x 600 -y 600` \
> octrees/kontor_CIE.oct > images/vwrays_illum.pic
> 
> # making falsecolor image of the illuminace image
> falsecolor -n 10 -s 1000 -lw 0 -cl -i images/vwrays_illum.pic >
> images/vwrays_illum_falsecolor.pic
> 
> Below is the viewfile kontor_ned.vp
> 
> rview -vtl -vp 6.4 8.4 2.79 -vd 0 0 -1 -vu 1 0 0 -vh 16.6 -vv 12.8 -vo 0 -va 0
> -vs 0 -vl 0
> 
> Below is the input for the working plane image:
> 
> void colorpict fc_val
> 7 red green blue images/vwrays_illum_falsecolor.pic fc_4.cal fc_u fc_v
> 0
> 0
> 
> fc_val glow fc_glow
> 0
> 0
> 4 10 10 10 0
> 
> fc_glow polygon office.working_plane
> 0
> 0
> 12
>                      0.2                   0.2                     0.8
>                      13.0                   0.2                     0.8
>                      13.0                  16.8                     0.8
>                      0.2                  16.8                     0.8
> 
> void mixpict mp
> 7 fc_glow void nonzero images/vwrays_illum_falsecolor.pic fc_4.cal fc_u fc_v
> 0
> 0
> 
> mp polygon office.working_plane.2
> 0
> 0
> 12
>                         0.2                   0.2                       0.8
>                         13.0                  0.2                       0.8
>                         13.0                 16.8                       0.8
>                         0.2                  16.8                       0.8
> 
> And below is the fc_4.cal file
> 
> nonzero(r,g,b) = if(max(r,max(g,b))-FTINY, 1, 0);
> fc_u = -(Py-16.6)/12.8;
> fc_v = (Px-0.2)/12.8;
> 
> I have not been working with HDR images. Maybe you can update on how to easily
> convert from pic-files to hdr-files in Linux, so I can upload these for
> illustration purposes.
> 
> Best regards
> 
> Per,
> 
> --- Den man 11/1/10 skrev Andrew McNeil <andrew.mcneil at arup.com>:
>> 
>> Fra: Andrew McNeil <andrew.mcneil at arup.com>
>> Emne: Re: [Radiance-general] Removing black areas in imagemapping
>> Til: perhaugaard at yahoo.dk, "Radiance general discussion"
>> <radiance-general at radiance-online.org>
>> Dato: mandag 11. januar 2010 19.19
>> 
>> Re: [Radiance-general] Removing black areas in imagemapping Hi Per,
>> 
>> Perhaps you are experiencing rounding error larger than FTINY.  I¹d suggest
>> replacing FTINY with a larger value (ie 2e-3) and seeing if black spots
>> reduce.  A bit of trial and error might be necessary.
>> 
>> If that doesn¹t work can you send more scene info?  I¹d like to see your
>> falsecolor statement, your colorpict and mixpict material definitions and
>> perhaps you could post your contour image in hdr format.
>> 
>> Best,
>> Andy
>> 
>> 
>> On 1/11/10 4:10 AM, "Per Haugaard" <perhaugaard at yahoo.dk> wrote:
>> 
>>> Dear users,
>>> 
>>> I am mapping a falsecolor image on a working in a room but there is still
>>> some black parts left in the image.  I have FTINY as a guard against
>>> rounding errors but it does not remove everything.
>>> 
>>> As written i Axel J. tutorial I have build a ..cal file with a nonzero
>>> function:
>>> 
>>> nonzero(r,g,b) = if(max(r,max(g,b))-FTINY, 1, 0);
>>> fc_u = -(Py-16.6)/12.8;
>>> fc_v = (Px-0.2)/12.8;
>>> 
>>> Any idea of how to remove the remaining black spots in the image?
>>> 
>>> The images can be seen at:
>>> http://perhaugaard.blogspot.com/2010/01/removing-black-parts-in-imagemapping
>>> -in.html 
>>> 
>>> 
>>> Happy new year
>>> 
>>> /Per
>>> 
>>>  
>>> 
>>> 
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