[Sidefx-houdini-list] PBR render noise, tips?

Abdelkareem Abonamous anamous at gmail.com
Mon Mar 31 06:46:39 EDT 2008

AFAIK, the main quality control for Micropoly PBR is the ray variance  
antialiasing (under the sampling tab). try changing that from the  
defaults (1 and 9) to something like 64 and 512.

PBR currently isn't too quick, specially MPBR. if you have some memory  
to burn, try the normal PBR which is much much quicker, but eats up  
memory like crazy. the main controls for PBR are the pixel samples.


On Mar 31, 2008, at 12:06 PM, Rangi Sutton wrote:

> Hey folks,
> Just wondering if anyone had some tips on getting PBR to render  
> nicely,
> particularly with the noisy grain artifacts?
> I have a shader with a reflectlight vop, and a lighting vop. Pretty  
> simple.
> The lighting is an environment light with an HDR image, and a large  
> square
> area light.
> I'm rendering with micro-poly PBR.
> atm = At The Moment.. my current settings:
> I adjust Pixel Samples (9x9 atm), shading quality on the object,  
> (15atm) ray
> shading quality (2atm) color limit (10atm), while the PBR tab on the  
> rop is
> all defaults.
> Whilst the image quality gets better as I dial up the sampling/dicing,
> render time starts to rocket. Right now I'm seeing pixel sized  
> noise, very
> filmic, but I'd rather be rid of it.
> Is there another setting I should hit as well by any chance? What  
> sort of
> order are folks adjusting these settings? Any tips?
> Beers,
> r.
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