int hedge_presrcpoint(<geometry>geometry, int hedge)
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
The point of the point into which the vertex that comes before the source vertex of the
hedge in the primitive that contains
hedge is wired.
-1 if the half-edge is not valid.
int presrcpt; // Get the pre-source point of half-edge number 3. presrcpt = hedge_presrcpoint("defgeo.bgeo", 3);