Nekar Xenos wrote:
> On Tue, 25 Jan 2011 03:25:50 +0200, Christian Froeschlin 
> <chr### [at] chrfrde> wrote:
> 
>> A "quick" gem/photon test scene that got a bit out of hand.
>> The diamond geometry is from "Whong" on TurboSquid. Also used
>> are POV-Tree and a HDRI probe from unparent.com. And yes I
>> know emeralds aren't usually cut like that ;)
>>
> 
> I like it. How did you do the grass?

Thanks! The grass is actually just a plane slightly
higher than the ground with the following pigment:

#declare P_GRASS = pigment
{
   granite scale 0.05 color_map
   {
     [0.5 color rgb <0,0.7,0>]
     [0.5 color rgbt 1]
   }
}

The transparency gives a bit of structure as shadows
get cast on the ground below. The latter is actually the
ground pigment of the HDRI probe (although not emissive).
But it's rather drab and low res so a ground plane with
light grayish-brownish bozo should give similar results.

The look also depends on the anti-aliasing, using focal
blur probably gives the grass some extra graininess.

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