"Kirk Andrews" <kir### [at] hotmailcom> schreef in bericht 
news:web.457eb359aa33b1599033e1160@news.povray.org...
> I'm trying to use the trace command to plant grass on my Isosurface
> landscape, but I don't want it to "grow" on steep grades.  Is it possible
> to use the slope pattern to control my distribution, or is there another
> way to do this?
>

All the answers given so far are excellent, however, I think you need an 
example scene now to understand it fully (I did).
I shall post one today in p.b.s-f under the same header.

Thomas

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