[Radiance-general] rpict and rtrace viewpoint differences?

[P George Lovell]

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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