Re: Importance sampling and sharp shadows in IBL

[Francois Lord <francoislord(at)gmail.com>]

I don't see the point of using an HDR image to create sharp shadows. Ray 
tracing lights are made just for that.

Dawa wrote:
> We are trying to get sharp shadows using IBL in mental ray and it 
> doesn't seem possible without flickering or super high numbers of Fg 
> points. Testing in Vray we can get nice crisp accurate shadows in a 
> fraction of the render time. They use something called Importance 
> Sampling on the Hdri map to optimize how many and where Fg shoots its 
> rays. Does anyone know anything about this? Does it exist in Mental 
> Ray? Any information would be great.
>
> Thanks
>
> Dawa
> --
>
> Dawa Fruitman
> Animation director
>
> TOPIX
> 35 McCaul St., Suite 200, Toronto, ON, M5T 1V7
> t  416.971.7711    f  416.971.9277
>
> www.topixfx.com
>
>
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