accurate net length calculation in virtuoso

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    SKILL: How to calculate total length of selected paths or pathSegs (cadence.com)

This will calculate the length of all the selected pathSegs (and paths). For long wires with multiple layer transitions it will be inefficient to select pathSeg by pathSeg. To conveniently select a complete wire...

    Disable via selection on the Palette Assistant.

    Navigator Assistant -> Nets -> RMB (over net) -> Select -> All Shapes on Net

This (complete net approach) might have a small error due to extensions within the via layer transitions.

Beware of T-junctions. This is not a point-to-point measurement but a sum of all the wire lenthgs.

I executed the skill code but it reported 0 path length. Not sure what is going wrong. Please see the attachment. 

I believe the function you want to call is CCScalLength().  Using CCSpathLength() would only return the length if your selected shapes are paths, not if they are pathSegs.

Thanks.

Thanks.