[Radiance-general] Modeling Challenge

[Mark de la Fuente]

Greg, thanks for the link.. Never actually used a BRTDfunc so I will have to look at that more closely.
 
Anyway, I went ahead tried to put a couple of cal files together since only one of our computers could handle the 3D grid despite my efforts, and got lucky with this one.  It seems to work great even though I'm not completely sure what the mod function is really doing.
 
Thanks for responding.
 
Mark de la Fuente
 
grid.cal
 
{
 The cal file for a "wire" mesh consisting of vertical cables holding up horizontal rods.
 This file could really be used to make any pladlike combination of two materials.
 The file is written around vertical surfaces.  If a horizontal grid  or some other orientation is desired, xform the material or modify the cal file.
 
 A1 = Width of vertical members
 A2 = Vertical member on center spacing
 A3 = Horizontal member
 A4 = Horizontal member on center spacing
 
 An example of how this would be used to cut rectangular holes out of a wall:
 
 void plastic wall
 0
 0
 5 .5 .5 .5 0 0
 
 void mixfunc grid_wallx
 4 void wall grid_x grid.cal
 0
 4 .1 .5 .05 1
 
 grid_wallx polygon box.1540
 0
 0
 12 ...
 
}
 
grid_x = if( f_grid_x, 1, 0 );
grid_y = if( f_grid_y, 1, 0 );
 
f_grid_x = and( grid_vert, grid_horiz(Px) ) ;
f_grid_y = and( grid_vert, grid_horiz(Py) ) ;
 
grid_vert = mod(Pz,A2) - A1 ;
grid_horiz(rod) = mod(rod,A4) - A3;
 
 
 

------------------------------

Message: 2
Date: Sat, 18 Jun 2005 09:13:45 -0700
From: "Gregory J. Ward" <gregoryjward at gmail.com>
Subject: Re: [Radiance-general] Modeling Challenge
To: Radiance general discussion <radiance-general at radiance-online.org>
Message-ID: <58DC6471-8DB7-4F34-B9A6-8B31647D7501 at gmail.com>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Hi Mark,

There is a file called grating.cal that models depth of 3-D grids and  
uses a BRTDfunc type to approximate the ensemble behavior.  I posted  
it in response to a similar request from Richard Clibborn:

     http://www.radiance-online.org/pipermail/radiance-general/2005- 
February/002438.html

If you want the actual appearance of the blinds, rather than simply  
its transmission at a distance, then a mixfunc is required.  I don't  
have time to write one right now, or even modify Georg's.

-Greg



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