`sketch.edge.start.index`

Syntax

i := sketch.edge.start.index(ep)

Get local index i of edge ep within the first block attached to the edge. This can be used to iterate through all blocks attached to an edge with the sketch.edge.start.block, sketch.block.next.block and sketch.block.next.index functions.

Returns:: i - edge index with i \(\ge\) 1
Arguments:: ep - edge pointer