## VW Messprinzipien - CAD Selection area

Use the options in the CAD Selection area in the VW Messprinzipien dialog box to display the CAD coordinates for the method you are measuring. For holes and standard parts, the coordinates are the center of the feature. For contour points, the coordinates are one or more CAD points that define the section cut plane, start point, and end point of the profile in which the contour points lie.

To display the CAD coordinates:

1. Select a measuring method. For help, see Creating a VWMP Command.

2. Complete the options in the CAD Selection area for the measuring method you selected.

- For contour (kontur) measuring methods, these options appear:

CAD Selection area for contour (kontur) measuring methods

Item | Description
| Snap to CAD Grid icon: Click this icon to snap the point to the nearest grid intersection.
| Apply changes icon: Click this icon to apply your changes.
Single click check box | To display the Rotation angle option, select the check box. To display the Counter and Rotation angle options, clear the check box. Counter scroll list: ??? Rotation angle box: The rotation angle of the section cut plane.
Edge Point | The options in this area display the calculated XYZ points and the IJK vectors.

- X, Y, Z Point boxes: Display the X, Y, and Z nominal for the location of the measuring method.

- I, J, K Surface boxes: Display the surface location of the measuring method.

- Flip Surface vector icon: Click this icon to reverse the direction of the surface vectors, causing the vector arrows to point in the opposite direction.

- I, J, K Edge boxes: Displays the calculated approach direction (vector) for the edge hit or for the points.

- Flip Edge vector icon: Click this icon to reverse the direction of the edge vectors.

Show Point check box | Select this check box to display the calculated CAD selection points in the Graphics Display window.

- For hole (loch) or standard part measuring methods, these options appear:

CAD Selection area for hole (loch) or standard part measuring methods

Item | Description
Calculated CAD point (feature center) | This area displays the calculated CAD points.

- X, Y, Z Point boxes: Displays the calculated point locations on the CAD model.

- I, J, K Vector boxes: Displays the calculated vector locations on the CAD model.

- Flip Surface Vector icon: Click this icon to reverse the direction of the surface vectors, causing the vector arrows to point in the opposite direction.

3. Do one of the following:

- For a loch (hole) or standard part measuring method, click on a selection point on the CAD. For example:

- For a kontur (contour) measuring method, single-click on a selection point on the curved surface. For example:

Double-click on selection points on the two planar surfaces. For example:

The calculated CAD selection points define the section cut plane:

Section cut plane

4. To create the VWMP command that you defined, click the Create button.

5. To close the VW Messprinzipien dialog box, select the Close button.