Is there any way to use a mesh in an isosurface function?

What I would like to do is apply transformations to a mesh, such as add 
f_noise3d() to the surface or something like that.  I couldn't find any 
documentation on the web site, or in the newsgroups on how to do this. 
Is it possible?  If so, how can one do this?

Regards,

-peter

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