[Radiance-general] prism2 problem

[Gregory J. Ward]

Hi Charudatta,

I'm afraid I can't be of much help, either.  I didn't write the  
fprism routine and I haven't even tested them recently -- can anyone  
on the list confirm that they are still working in the latest  
release?  I hope so.

Just glancing at your file, the length values seem suspiciously  
small.  Also, your angle of acceptance for source aiming (pi radians)  
is larger than it should be -- perhaps you put this in there for  
testing?  What is your reference for which lengths correspond to the  
first four parameters (A1 to A4)?  Also, which face is "beta" and  
which is "gamma?"  I'm not certain.

Any help is appreciated.  (Raphaël?)

-Greg

> From: "Charudatta Joshi (CJ)" <csjoshi at asu.edu>
> Date: April 29, 2007 12:54:32 PM PDT
>
> Hello,
>
> I am working on a school assignment. I am having problems with  
> "prism2" while trying to render an interior scene with a prism as a  
> skylight.
>
> I have a room 7.85m x 5.85m, 3.0m in height with a rectangular  
> skylight 2.8m x 2.9m in the centre of the ceiling (I have attached  
> with this email the .rad file of the prism I made). I am trying to  
> study impact of prism as skylight on this interior environment,  
> which is meant to be an artist's studio. Please tell me the correct  
> procedure of using prism2 correctly.
>
> The opaque face of the prism faces South while transparent face is  
> on North. My rendered image with the prism comes out as dark  
> without any diffused light from North. Why is it so?
> To get values of A1, A2, A3, A4, I created the geometry in AutoCAD  
> and measured these values there. Is this a good way of doing this?  
> Or do you suggest some other way?
> If I do it correctly, would I be able to see the prism in the  
> rendered image?
> Can you send me any sample prism.rad file to understand better?  
> Please mention the orientation of the prism and its geometry angles.
> Here's how I have been doing after editing the .rad files:
> oconv phxsky.rad > phxsky.oct
> mkillum -ab 1 -ad 256 -av 20.7 20.7 20.7 phxsky.oct < mout.rad >  
> iout.rad
> oconv flr.rad clg.rad wall.rad sill.rad glass.rad prism.rad  
> phxsky.rad iout.rad > octree1
> rview -vp .1 3 1.7 -vd 7.35 0 0 -vv 78 -vh 90 -ps 1 -ds .05 -ab 1 - 
> ad 256 -av .001 .001 .001 -as 256 -ar 256 -dj .05 octree1
> I sincerely appreciate your timely help.
>
>
> Warm regards,
>
> Charudatta Joshi (CJ)
> Student, MS-Building Design, ASU
>