return a set of coordinate data from a polyline defined by 2 sets of 2d coords
| whichSet | integer | 1 = first set of coords, 2 = second set |
| pCrdIdx1 | VARIANT | first coordinate type 1 = x, 2 = y, 3 = z |
| pCrdIdx2 | VARIANT | second coordinate type 1 = x, 2 = y, 3 = z |
| pCoords | VARIANT | coordinate data (first coord, second coord, fillet radius), repeat, ... |
| Return value | integer | error flag, non-zero = error |
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