Lothar Esser wrote:

> 
>    Hi Michael,
> 
>      thanks for the suggestion to use blobs. A scene with a blob instead
> of cylinders is about 5 - 7 times faster. However I am not totally
> thrilled with the shape of the blobs. If I use a small threshold to make
> a cylinder look like a cylinder and not like a sausage lots of black
> dots/ patches appear. Is that a bug ? Why is it not possible to use a
> threshold of near 0 ? Is that a numerical problem ?  -I guess so-
> Also it appears to me that blobs are slightly less transparent than
> cylinders with the same transparency. I cannot quantify this observation
> though - I might have done something wrong ...
> 
> Thanks for the good advice !
> 
>   Lothar
> 
> P.S. I am aware of the time penalty to pay for transparency and
> reflection / refection or radiosity. All I am trying to do is to
> minimize the rendering time if I can.

Just curious, but what is this of that you need so many transparent
objects? Did you mention something about medical something or other? I
forget. If it is interesting to the general public, post an image to the
povray.binaries.images group.

Ross
-- 
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"Treat the earth well: it was not given to you by
your parents, it was loaned to you by your children.
We do not inherit the Earth from our Ancestors, we 
borrow it from our Children." 
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