I'm able to drape feaures on a DTM with SurfaceModeller, but I want to have Z distance between the point (for exemple on a three) that I project and the same point projected (on the ground).
how can it be possible?
thanks
Hello,
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To get this, all you need to do is use the CoordinateExtractor twice on the feature.
First, use it on the feature before you manipulate it. Save the z variable to something like _AMSL
Then, use the SurfaceModeller (or draper) to drape the feature.
Then, use the CoordinateExtractor again. Be sure to rename the z variable to something different from the first time. In this case, call it _GroundLevel.
Now, create a third attribute with the AttributeCreator, called _AGL. Define it as a formula, which is _AMSL - _GroundLevel.