An ECAD area must have only one filled area. ECAD tools identify one filled as a distinct ECAD area and allow modifications of the area. Therefore, every ECAD area should have one ECAD-MCAD ID for unique identification and processing of a change in ECAD-MCAD collaboration.

An ECAD Area is a closed loop area and problems can arise when you want to cut out parts of the closed loop. A single cutout area should be defined by one closed loop.

In the figures below the ECAD area is represented in blue and the cutout area is represented in white.

The following figure is a valid closed loop ECAD area with no cutout areas.

The following figure is an example of a valid ECAD area with one closed loop and one cutout closed loop area.

The following figure is an example of a valid ECAD area with one closed loop two closed loop cutout areas.

When you want to create complex areas, such as those in the figures below, it is recommended that you use two ECAD Area features to represent them. In the figure below there are 2 ECAD Areas and two cutouts.

In the figure below there is one cutout and 2 ECAD Areas.