[pstricks] yMaxValue mechanism in 3d plots

[$nake]

Hello,

When plotting functions with pst-plot, it is possible to set the yMaxValue to
ignore the points whose y-coordinate (the value of the function) are beyond that
threshold (for instance, for dealing with singularities).

Would it be possible to implement a similar mechanism in pst-3dplot, say a
zMaxValue parameter that would work with \*ThreeD commands?

Cheers
Hugo