| pGeoInst | INTEGER | Pointer to the GeoInst which contains the instance |
| InstIndex | INTEGER | 1-Based Instance Index |
| Element | INTEGER | 1-Based Element Index |
| X# | FLOAT | The custom element's new X value |
| Y# | FLOAT | Optional: The custom element's new Y value |
| Z# | FLOAT | Optional: The custom element's new Z value |
| W# | FLOAT | Optional: The custom element's new W value |