In article <3a3ed2af@news.povray.org>, "Andy Cocker" 
<big### [at] mariner9fsnetcouk> wrote:

> I take it I need to use the data that  trace () returned to give me 
> the surface normal, and then rotate each object to match... at 
> present I am very unclear how to do this,
...

Try the Reorient macro, it is on the Thoroughly Useful Macros page:
http://users4.50megs.com/enphilistor/macs.htm

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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