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nl:produkte:cad_2017:objekte_mit_abzugsflaechen [2016/03/23 14:08] (huidige)
Regel 1: Regel 1:
 +====== Object with subtraction area ======
 +===== Description =====
 +In many situations it becomes necessary to define subtraction areas (also called islands). ​ With this, one or more areas can be subtracted from a source area (refer to graphic). After creating a subtraction area the properties **distance** and **area** of the source area are recalculated.
 +Areas can be deducted from both, 2D-objects and 3D-objects. ​
 +<WRAP round important 90%>
 +Please note that DTM models are special objects. Do not use those objects with subtraction areas.
 +===== Procedure =====
 +If you want to subtract an island from an already detected area you have two options: ​
 +  * **Option 1:** Detect both areas. Click onto the island´s area and drag it with the mouse in the tree onto the area you want to deduct it from.
 +  * **Option 2:** Mark in the object tree the area that you want to deduct an island from. Then detect the subtraction object as a new object. The new object will then be sorted automatically behind the already detected area.
 +The object tree to the example in the graphic looks like this:\\ {{:​produkte:​cad:​planung:​mas0007.gif?​nolink|}}\\ \\ Graphical properties are not applied to subtraction areas. In the [[Optionen]] you can specify, if you want to label subtraction areas negative or positive.
 +<WRAP round tip 90%>
 +Subtraction areas do not occur individually in a point balance. If you want to add the islands to a group as well, copy the areas (see [[Massenbaum]] > Functions) to apply them one time as subtraction areas and one time as individual area.