hedge_prev

int  hedge_prev(<geometry>geometry, int hedge)

Returns -1 if hedge is invalid. Otherwise, returns the number of the half-edge that precedes (its destination is the source of) hedge in the polygon that contains it.

<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.

hedge

Input half-edge.

Returns

The number of the half-edge that precedes (its destination is the source of) hedge in the polygon that contains it. Returns -1 if the half-edge is not valid.

Examples

examples

int prev;

// Get the previous half-edge of half-edge number 3.
prevhedge = hedge_prev("defgeo.bgeo", 3);