Objects with deduction areas

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In many situations it is necessary to define deduction areas (including subtraction or island areas). One or more surfaces can be subtracted from an original surface (see graphic). After creating a deduction area, the properties for distance and area of ​​the original area are recalculated.



Both from 2D objects and from 3D-Objekten surfaces can be deducted.

If you want to subtract an island area from an area that has already been recorded, you have two options:

• Possibility 1: You capture both areas, click on the island area and then drag it with the mouse in the tree onto the area from which it is to be subtracted.

• Possibility 2: You mark the area in the mass tree from which an island area is to be subtracted and then enter the island area as a new object. The new object is then automatically sorted behind the area already recorded.

The result in Mass tree for the example shown above in the graphic looks like this:



Graphic properties are not automatically inherited on deduction areas when they are created. In the Options you can set whether deduction areas should be labeled negatively or positively in later labeling.