vertexprimindex

int  vertexprimindex(<geometry>geometry, int linearindex)

Note To convert the linear index into a primitive number and primitive vertex number, use vertexprim and vertexprimindex.

<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.

linearindex

The linear index of a vertex

Returns

The vertex’s number within the primitive that contains it, or -1 if the vertex has no primitive.

To get the primitive number of the containing primitive, use vertexprim.

Note Due to the nature of the geometry structure, the first time this is run on a geometry it has to run over all primitives to find the look up table. This will be amortized out if most vertices are invoking this function.

Examples

examples

int prim, vtx;

// Find the primitive and vertex offset of the linear vertex 6.
prim = vertexprim("defgeo.bgeo", 6);
vtx = vertexprimindex("defgeo.bgeo", 6);