_Light_Beam_ wrote:
> Can somebody help me to do this ?! I've uded a cylindrical pigment to make
> it but I don't know how to make it softly (soft edges of the crater) and
> combine with anothe function to replace crater's edge by rocks or collapsed
> edge... Thanks

You can try modellling the crater with a spline function and use it like:

function {
   y - f_spline_crater(f_r(x, 0, z)).x
}

Christoph

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