Waooww !!
I knew your great isosurface tut, but I hadn't seen the others !!
This hole tutorial is very clear and usefull, I think I'll redesign my 
menger sponge now.
The alpha shadows is also a question I thought about for a few weeks ...
Thanks a lot,

JC

Mike Williams wrote:
> Wasn't it Fuzzy who wrote:
> 
>>Hi,
>>
>>I've created a cylinder with a difference taken from it of many smaller
>>cylinders to punch 'holes' into the surface and it takes *forever* to
>>render...
>>at quality 1 it took just over 7 HOURS to render a very simple image at only
>>640x480!  (this is using 676 cutout cylinders to make 1352 'holes', as the
>>smaller cylinders were extended larger than the diameter of the main
>>cylinder to require half as many :)
>>
>>I've started another run at quality 9... it's taken 6 hours so far and is
>>only up to line 99 of 480...
>>
>>I know that CSG is slow but... :)
>>
>>I think if I did the 'holes' as a texture map instead then it would be a LOT
>>faster, but is there any way to create a texture on the fly within pov,
>>rather than having to create some jpg or other to use as a filter?
>>
>>(I want to be able to do it on the fly as I want to be able to change the
>>shape of the holes, cylinders was only going to be the start...)
>>
>>Fuzzy
> 
> 
> 
> If you ever try to construct an object that has a lot of holes in
> POVRay, you'll find that it renders incredibly slowly. My Holes Tutorial
> attempts to explain why this happens and suggests something that you
> might be able to do about it.
> 
> <http://www.econym.demon.co.uk/holetut/>
>

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