Wasn't it Larp who wrote:
>Alain wrote:
>
>> How are the holes made?
>> Transparent parts in the image_map, or actual holes made
>> with a diference? With the diference, you can try using a
>> merge of all the holes, it could be somewhat faster.
>
>Holes are "real holes": rotated cylinders grouped in an
>union and then differenced with a can.
>
>Should the merge be faster than the union? At least
>Documentation says opposite:

The situation with the speed of holes is quite complicated. I have a 
series of pages about the situation here:
    http://www.econym.demon.co.uk/holetut/index.htm

Because your holes are randomly placed, the first three tricks won't 
work, but the fourth trick might:
    http://www.econym.demon.co.uk/holetut/holes4.htm

-- 
Mike Williams
Gentleman of Leisure

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