Autodesk 00128-051462-9310 User Guide - Page 1029

3 Select the AEC Polygon to merge with the first AEC Polygon. NOTE You can merge only those AEC Polygons that lie on the same Z-plane. Two AEC Polygons with different Z-positions in the same coordinate system cannot be merged. 4 Enter y (Yes) to erase the second AEC Polygon, or n (No) to leave the AEC Polygon in the drawing. Merging two overlapping AEC Polygons Creating a Hole in an AEC Polygon Use this procedure to subtract AEC Polygons from one another in order to create a hole in an AEC Polygon. This would be useful, for example, for creating a complex pattern for a curtain wall infill. Subtracting an AEC Polygon from an AEC Polygon To perform a subtraction operation, you need to select AEC Polygons that intersect one another. You can choose whether to keep the subtracted AEC Polygon in the drawing as a separate unit. For example, you may want to keep the AEC Polygon if you need to subtract the same shape from other AEC Polygons. 1 Create an AEC Polygon from which to subtract a hole. For more information, see "Creating an AEC Polygon" on page 980. 2 Create a second, smaller AEC Polygon to represent the area to be subtracted from the larger AEC Polygon. You can draw the second AEC Polygon within or overlapping the area of the first AEC Polygon, or you can draw it in another location and then move it onto the larger AEC Polygon. 3 Select the larger AEC Polygon, right-click, and click AEC Modify Tools ➤ Subtract. 4 Select the smaller AEC Polygon to subtract from the larger AEC Polygon. 5 Enter y (Yes) to erase the subtracted AEC Polygon, or n (No) to leave the AEC Polygon in the drawing. Creating a Hole in an AEC Polygon | 989