3DInterpolator

From Fmepedia

3DInterpolator is a Workbench Transformer.

Interpolates elevation values along a linear feature from a starting value to an ending value. The resulting feature’s elevation will monotonically increase (or decrease) from the starting value to the ending value.

Each of the parameters may either be entered as a number, or can be taken from the value of a feature attribute by selecting the attribute name from the pull-down list.

If the feature was two-dimensional, it becomes three-dimensional.

If the feature was three-dimensional, its previous elevations are wiped out and replaced.

Note that the SurfaceDraper transformer (available in FME Professional and higher) can be used to supply interpolated elevation values based on a 3D grid or set of 3D features to the vertices of 2-dimensional features.