[Radiance-general] Rendering large space with small detail (small picture now attached!)

[Rob Guglielmetti]

Hi Paul,

Bottom line, the easiest way to avoid splotchy artifacts is to bring  
the direct light contributions closer and closer to the surfaces  
visible in the image. I'm having a hard time understanding what the  
lighting design is in this image. There seems to be a cove or  
something on the left, and some baffled ceiling condition to the right  
of that, that changes in plan. maybe you could describe the lighting  
design and the section of that ceiling? Where is the skylight and what  
is the section of that in relation to this scene? What are the  
characteristics of the media between the external daylight and the  
interior scene? That information might inform a solution to these  
rendering issues (because there may be a solution to them that takes  
less than 20 hours to get results better than what you have posted).  
Either way, for a scene this apparent size, the -ar seems low right  
off the bat; also, the -ab is way high for an image (generally  
speaking); and the -ad and -as are probably too low.


On May 18, 2009, at 6:32 PM, Paul Chilton wrote:

> Hello,
>
> I’m using Ecotect as the geometry interface and file generator to  
> Radiance.
>
> For day-lighting purposes, I’m modelling a large space which  
> includes areas of small detail. After many lengthy iterations (20+  
> hours for each simulation) the best image I could generate is the  
> image attached.
>
> My problems are the splotchy nature of the light being reflected off  
> the ceiling space and the baffled louvers under the skylight. The  
> render settings that I used to generate the image are as follows;
>
> -dp=
> -ar=
> -ms=
> -ds=
> -dt=
> -dc=
> -dr=
> -sj=
> -st=
> -ab=
> -af=
> -aa=
> -ad=
> -as=
> -av=
> -lr=
> -lw=
> 512
> 128
> 3.4
> 0.3
> 0.1
> 0.5
> 1
> 0.7
> 0.1
> 8
> RCP.amb
> 0.1
> 1023
> 512
> 0.01 0.01 0.01
> 6
> 0
>
> I’ve increased the accuracy of the variables which I thought were  
> critical to the accuracy of the render. These were; ambient  
> resolution (ar), ambient bounces (ab), ambient accuracy (aa),  
> ambient divisions (ad) and ambient super-samples (as).
>
> Is it a case of increasing the accuracy of these specific variables  
> further or is there an easier or quicker way to achieve better  
> rendering?
>
> Any help would be greatly appreciated.
>
> Thanks,
>
>  --
> Paul Chilton
>
> Renewable Energy Engineer
>
> [m] 0400 306 791 | [e] p.chilton at gmail.com
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