The threshold keyword simply sets the value that is searched for when
finding the surface of the object, it has nothing to do with the
function itself. Not really sure what you are looking for...maybe the
min and max functions?
min(A, B) will return A or B, depending on which is lowest. max() works
the same, but returns the greater one. If you use 1 for one of the
values, and the density function for the other, it will return the value
of the density function if it is less than 1, otherwise it will return
1.

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