[Radiance-general] modelling perforated materials

[John Ford]

Greg, 

The spec at the moment is 4mm thick aluminium with 8mm diameter holes at 12mm pitch in a hexagonal pattern. The open area is 40%. The viewing position is at a distance, so correct average behaviour might work, however I am relying on the inside surface of the holes to reflect light to the viewer, so I’m not sure how using a trans material or suchlike would work in this case. The plan was to render one panel to show effect of being internally when veiwed from below on ground level. 

Thanks, 
John. 

(may be duplicated- replied from wrong address)


> On 22 Jul 2015, at 1:51 pm, Greg Ward <gregoryjward at gmail.com> wrote:
> 
> Hi John,
> 
> How big are the holes relative to the thickness of the material?  What percentage of "holiness" does the surface possess, on average?  Are the wholes aligned in a grid or a hexagonal pattern?  Are you going to be in a rendering position where you actually see the holes, or do you just want the correct average behavior with a minimum of noise?
> 
> Cheers,
> -Greg
> 
>> From: John Ford <john at relume.com.au>
>> Subject: [Radiance-general] modelling perforated materials
>> Date: July 21, 2015 8:35:44 PM PDT
>> 
>> Hi, 
>> 
>> I’m trying to find the best way to model a perforated aluminium panel and struggling with antimatter materials and such like. Could someone please advise how to do this without ending up with a massive number of surfaces? I haven’t found many examples of how to use the antimatter material apart from the glass lotus in Rendering with Radiance.
>> 
>> My initial assumption was that the panel should be made with genbox then an array of antimatter holes should be added using cylinders of antimatter material, slightly longer than the thickness of the panel. Would it also be possible to genbox the panel then insert tubes into it or would the face of the panel still be present? 
>> 
>> Thanks, 
>> 
>> John Ford. 
> 
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