| Since | 17.0 |
int [] polyneighbours(<geometry>geometry, int primnum)
<geometry>
When running in the context of a node (such as a wrangle SOP), this argument can be an integer representing the input number (starting at 0) to read the geometry from.
Alternatively, the argument can be a string specifying a geometry file (for example, a .bgeo) to read from. When running inside Houdini, this can be an op:/path/to/sop reference.
This returns an array of primitive numbers of polygons that share an edge with this polygon. It uses the Half-Edge data structure so will work with geometry that supports that (ie, polygons)
Examples ¶
This is roughly equivalent to the following code:
int[] polyneighbours(const string opname; const int primnum) { int result[] = {}; int start = primhedge(opname, primnum); for (int hedge = start; hedge != -1; ) { for (int nh = hedge_nextequiv(opname, hedge); nh != hedge; nh = hedge_nextequiv(opname, nh)) { int prim = hedge_prim(opname, nh); if (prim != -1 && prim != primnum) { append(result, prim); } } hedge = hedge_next(opname, hedge); if (hedge == start) break; } return result; }
| See also | |
| proximity |