> On 09/23/2012 09:34 AM, clipka wrote:
>> Am 23.09.2012 14:45, schrieb James Holsenback:
>>> After /still/ having problems my amethyst ring I decided to isolate just
>>> the stone and I think I've uncovered another bug. It appears that
>>> filtered transparency isn't working with photons.
>>>
>>> In the first image you can see the photons when I have srgbt <0.4980,
>>> 0.2902, 0.4235,1> in the material definition, and the second image the
>>> photons aren't showing up when I have srgbf <0.4980, 0.2902, 0.4235,1>
>>> in the material definition: that is the ONLY difference is srgbt then
>>> srgbf
>>>
>>> The scene file is posted in p.b.scene-files
>>
>> That's a negative. Here's an enhanced version of your image, showing
>> that photons /are/ at work.
>>
>> Try using solely fade interior for the color; it's more realistic anyway.
>>
>
> OK ... so been playing around with fade_color/distance/power in interior
> and not even close to looking like an amethyst!
>
> Mind posting the material definition you used?

When using fading interiors, the key is fade_distance. If you want 
deeper colour, use a smaller value.
Use fade_power 1. Aletrnatively, you may want to use fade_power 1001.

For gemms, I tend to use a fade_distance value between 1/2 and 1/10 the 
dimention of the gemm. Larger values are used for make the stone look 
smaller.



Alain

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