Return one or other set of coordinates from a polyline defined by two sets of 2D coordinates
| whichSet | integer | 1 = first set of 2D coordinates, 2 = second set of 2D coordinates |
| CrdIdx1 | integer | First coordinate type 1 = x, 2 = y, 3 = z |
| CrdIdx2 | integer | Second coordinate type 1 = x, 2 = y, 3 = z |
| Coords | integer | Coordinate data (first coord, second coord, fillet radius), repeat, ... |
| Return value | integer | Error code 0 = no error, -1 = no coordinates all other values = error |
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