Tom -

It might be possible to add in an isosurface "blob" with a negative
weight that will make a crater in your sand.  If you have to construct
the thing yourself, you could use something like

#define myblob(x,y,z) = function{ (1+sqrt( pow(x-x0,2) + pow(y-y0,2) +
pow(z-z0,2)) exp( sqrt( pow(x-x0,2) + pow(y-y0,2) + pow(z-z0,2) ) }

so if you set <x0,y0,z0> to be at the center of your rock and
subtract(add) the function and you have an instant rock crater(hill)!

- Ben Birdsey

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