To overwrite the rule, there are some options: (a) to use the rule-defined value, (b) manually add a user-defined value, (c) object attribute, (d) shape attribute, or (e) layer attribute. This window provides values to the parameters of a rule. The following figure shows how a rule can be overwritten (2nd method mentioned above). These types of randomization are not a representation of reality. The last method is used in creating virtual cities that should have certain characteristics. In order to modify the resulting 3D models, different possibilities exist: (1) edit the rules by scripting, (2) overwrite the rule parameters of a rule set on a per-building basis, and (3) if stochastic rules are used (rules with random parameters), the random seed of all or single buildings can be altered.
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