[Radiance-general] Re: .cal files

Sun, 28 Jul 2002 14:10:31 -0700

Hi Jerome,

It's generally a bad idea to attempt to do any file i/o when evaluating 
the expressions in a .cal file, as this would incur a cost at every ray 
computation.  It's better to read and parse a file once, then deal with 
it in memory.

Certain types of materials can use the .dat file format to handle 
interpolated tables, but not prism or prism2.  For these, you may use 
the tabfunc program to generate 1-dimensional tables for you, with 
optional interpolation, and include the output as part of your .cal file.

-Greg

> Date: Fri, 26 Jul 2002 11:34:13 +0200
> From: [email protected]
> To: [email protected]
> Subject: [Radiance-general] .cal files
> Reply-To: [email protected]
>
> Hi there!
>
> I need some help with the .cal files...
>
> 1) Is it possible inside a cal file to execute a shell command and use 
> its
> properly formatted output ?
>
> I am using a prism2 material, and I would like to cast an other program 
> that I
> wrote inside the cal file casted by prism2...
>
> 2) alternatively
> Is it possible to read a data file inside a cal file ? I want to read 
> different
> angular behavior materials with the same cal file... And not to include 
> them IN
> the cal file everytime!
>
> Thanx !!!
>
> Jerome