Christoph Hormann wrote:
> 
> Coding this technique into povray is an interesting idea, it surely
> makes things more effective, but NTL you will have to decide whether
> you calculate things in advance (leading to longer parsing time and
> more memory use), or during trace (slowing it down).

The option of calculating during the trace probably won't slow things
down that much.  The internal bounding for each patch can be done on the
fly with fairly good speed, and calculating the coefficients of the
quartics themselves is just as fast.  The fact that the patches are
quartic surfaces will make any additional calculations relatively
unimportant as far as speed considerations go.

Regards,
John
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