[Radiance-general] rpict and rtrace viewpoint differences?

[Andrew McNeil]

George,
To generate an image with rtrace you should add -fac and change -osv to
-ov.  -fac tells rtrace to expect ascii input and to output in HDR format
(4-byte float pixels).
For clipping, planes you can use -va and -vo in the view file.
hope this helps,
Andy


On Wed, Mar 19, 2014 at 7:19 AM, P George Lovell <
p.g.lovell at st-andrews.ac.uk> wrote:

> Thanks Chris, I should have noticed that one! (doh!).
>
> I'll listen out for any further advice on the clippin/mapping.
>
> Thanks again.
>
> George
>
>
>
> On 19/03/2014 13:57, Chris Coulter wrote:
>
>> George,
>>
>> My guess would be the -vh and -vv included in your rpict command. These
>> will change the x and y mappings of your view.
>> Are they the same values in your view.vf file? If so, they are redundant
>> and could be misleading in the future. If not, this is why your rpict and
>> rtrace images do not align (vwrays is generating a different set of rays).
>>
>> Sorry, but I don't have a quick answer/suggestion for your other
>> questions.
>>
>> Hope this helps.
>>
>> Chris
>>
>> -----Original Message-----
>> From: P George Lovell [mailto:p.g.lovell at st-andrews.ac.uk]
>> Sent: Wednesday, March 19, 2014 7:55 AM
>> To: Radiance general discussion
>> Subject: [Radiance-general] rpict and rtrace viewpoint differences?
>>
>> Dear Radiance People.
>>
>> I'm rendering scenes with both rpict and rtrace and I noticed some
>> discrepancies between them. Despite both using the same view point
>> definitions my images differ between the two renders: (the scene shows a
>> green rectangular panel, a green elipsoid, some sky, green ground).
>>
>> 1) the rpict image (top in the attached file) seems to normalize the sky
>> values so that they aren't too bright.
>> 2) the rtrace image has a subtly different viewpoint.
>>
>> Three questions:
>>
>> 1) Can you tell me which command arguments determine the way that image
>> values are clipped or remapped?
>> 2) Can I specify the same clipping in rtrace?
>> 3) Why are the views different despite using the same viewpoint?
>>
>>
>> Here are the commands I'm running, in the sequence that they are executed.
>>
>> rpict -vf view.vf  -x 2400 -y 2400 -vh 28.07 -vv 28.07 -ps 2 -pt 0.03
>> -pj 0.95 -dj 0.85 -ds 0.09 -dt 0.03 -dc 0.75 -dr 5 -dp 0 -sj 0.85 -ab 5
>> -ar 64 -ad 2048 -as 1024 -lr 12 -lw 0.001 wholeScene.rpict
>>
>> pfilt -x /1 -y /1 -rad 0.60 wholeScene.rpict > wholeScene.pic
>>
>> vwrays -vf view.vf -x 2400 -y 2400 >surfaces.txt
>>
>> rtrace -h -osv wholeScene.oct < surfaces.txt > rtrace_surfaces.txt
>>
>> Best wishes,
>>
>> George
>>
>>
>>
>
> --
> Dr P. George Lovell,
>
> Lecturer in Psychology
> University of Abertay Dundee
> Dundee
> DD1 1HG
>
> Tel 01382-308581
> Fax 01382-308749
>
> Researcher/Co-investigator,
> School of Psychology, University of St Andrews
>
> RM 2.27 (The Yellow Room).
> Phone      (01334) 463056
>
>
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