#### CAD Controls

CAD Controls area

The CAD Controls area allows you to specify the CAD surface elements that will be used to define the “Theoretical Points”. In some cases, a scan might start over a certain surface and travel over many other surfaces before completion. In such cases, PC-DMIS does not know which CAD elements are to be used to generate the scan. It must therefore search through every surface in the CAD model. If the CAD model has many surfaces it might take a long time before the scan generation is successful.

To use this functionality to select CAD surfaces, you must have the ability to import and use CAD surface data. Ensure that you select the Draw Surfaces button or else when you click on the CAD model the nearest wire gets selected instead of the selected surface.

To avoid this delay:

1. Select the Select check box.

2. Click on the appropriate surfaces. Once a CAD surface is selected, it will be highlighted in the Graphics Display window. The Status bar will display the number of surfaces that have been selected.

3. Even though you have selected surfaces, PC-DMIS will still slice all the surfaces with the cut plane and init point to generate the Theoretical Points for the surfaces. If you only want the selected surfaces used in the generation, select the Only Selected option.

If you mistakenly select a surface, click on that surface a second time. This will deselect the surface. Clicking the Deselect button will deselect one surface at a time with each click of the button from a group of highlighted surfaces until all are deselected. Clicking the Deselect All button will deselect all highlighted surfaces at once.

If you don’t select the Select check box, PC-DMIS will assume any clicks on the surface to be Boundary Points.

Select

The Select check box allows you to select CAD surface and wire frame elements that will be used to find the nominal.

Only Selected

The Only Selected check box forces the path generation routines to only use the surfaces that have been selected by the user.

Deselect

The Deselect button removes one highlighted CAD element at a time from a group of CAD elements that are created using the Select check box.