[R] persp plot question..

[Colin Gillespie]

Dear All,
	I have been trying to to do this for a few days now. I can generate
persp plot OK and can generate it in colour using the command

persp(x,y,z,col=terrain.colors(20))

However, I was wondering if it is possible to shade the 3d surface like a
contour plot. i.e. black for large z, white for small z, say

Thanks in advance

Colin

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