[Radiance-general] Modeling Challenge

[Gregory J. Ward]

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


> From: "Mark de la Fuente" <MdelaFuente at wmtao.com>
> Date: June 17, 2005 9:15:52 AM PDT
>
> Hi Radiance group.
>
> I've got a modeling problem.  I'm trying to accurately create  
> this... but so far all I've managed to do is waste a bunch of time.
>
> http://members.fortunecity.com/dela/
>
> (note the bottom image is a radiance image)
>
> Currently I have two individual cylinders each as a rad file.  Then  
> I have a scene file that xforms these into a ~16,000 unit array.   
> That file is then rotated and transformed onto the building by an  
> additional scene file, which is then called by oconv by a "rad"  
> like script.
>
> It works, but it takes a very long time to oconv (I guess b/c it  
> has to run xform 16000 times and Radiance on Cygwin is very slow at  
> this based on benchmark results) and so far I have been unable to  
> create an actual rendering for some reason.
>
> What other options might work for something like this?  I've  
> thought about using a mix of void and metal similar to Georg  
> Mischler's perforated metal technique.  Would this be more efficient?
>
> My only concern about a flat plane is that you would not get the  
> same "cut off" as the 3D grid.  However, given the small scale of  
> the grid to the large scale of the building, this is perhaps  
> negligible.
>
>