[Radiance-general] Re: Fw: How to increase the rendering speed?

[Greg Ward]

Hi Huang,

If the average reflectance of large surfaces change in your model,  
then reusing the ambient file will result in under- or over- 
estimation of the interreflected component.  If the average  
reflectance (and color) of your surfaces changes little, then  
removing the ambient file is not necessary.

-Greg

> From: "Huangwx" <ap.huangwx at archi.kyoto-u.ac.jp>
> Date: December 12, 2005 11:14:15 PM PST
>
> Dear Greg:
>
> I am very sorry for posting images to the mailing list.
>
> Thanks very much for your suggestion.I have fixed the problem by  
> setting the roughness of floor to 0.01.
> And I have speed up the rendering process by increasing the -aa value.
>
> The AMBFILE seems can help to get better rendering results, and  
> greatly increase the rendering speed
> for the same model. But I think when I change materials of the  
> model, I should delete the old ambient file
> and let Radiance generate a new one, otherwize the result will be  
> incorrect. Am I right? Or maybe the
> ambient file can be reused by models with similar materials?
>
> best wishes.
>
> Huang
>