Setting Model Properties

The main purpose of Model Properties is to define the size of your model and the period of time you are going to simulate. You must define these properties before exporting the model for use in LEGION Simulator, as a model without these properties cannot be simulated.

Tip: In rare circumstances, you may wish to turn off Auto-navigation throughout a model; you can do so on the 'Auto-navigation' tab.

There is also a slider control which enables you to set the ‘Distance Estimation Error’. This determines the accuracy with which Entities can estimate distances for the purposes of choosing target objects or avoiding congestion (see step 6).

To set Model Properties:

Click or select Data > Model Properties.
The ‘Model Properties’ dialog box is displayed.
If your model already contains CAD or Spatial Objects, click the Fit button to size and centre the model’s dimensions around your plan or objects.

Enter the Model Dimensions (X size, Y size, X offset, Y offset).

These settings define the size of the model and its centre in relation to the total workspace area.
Enter the duration of the Model Run Time using the format hh:mm:ss (the default setting is one hour).
(Optional) You can enter a Model Start Time. You probably won't need to do this as the model will take its start time from your imported data template.
The Model End Time is added automatically (this cannot be later than 23 hours, 59 minutes and 59 seconds after the Start Time).
If you do enter a new start time and wish your imported data profiles to reflect the new time, check the Adjust Data Profiles to match start box.
Note: This adjustment shifts the demand data in relation to the Model Start Time, ensuring that no data is lost by being outside the time frame of the simulation. This is not obligatory if you have changed the start time (for instance you may want to omit a period at the start of the run time in which there is no data).
Set the percentage of Distance Estimation Error (0%–20%) by dragging the slider control to the required level. Note that the default percentage is set at 5%.

If your model's CAD contains many long arc shapes, processing them may take longer. You may like to alter how they are approximated by setting an 'arc tolerance level'. The higher the tolerance, the less precisely the arcs are drawn. This may increase speed but reduce accuracy a little. Experiment, if necessary, to find the right balance.

Check the box labelled 'Adjust the accuracy with which arcs are drawn' and adjust the slider.
Switch to the 'Auto-Navigation' for the following steps.
1. In the unlikely event that you wish to turn off Auto-navigation throughout a model, click the 'Auto-navigation' tab and uncheck the box labelled Enable Auto-navigation. Recheck the box to enable Auto-navigation again.
2. If you enable Auto-navigation and want Entities to aim for the focal point of objects (rather than aim for the focal segment in general), click the 'Auto-navigation' tab and check the box labelled 'Always use focal points for Auto-navigation'. This overrides any target parameters you may have set in individual objects. See Target Parameters for more information.
3. 'Enable isovist grid caching' enables the LEGION Simulator to calculate and retain a grid of each Entity's zone of vision. This speeds up simulations but uses a lot or memory. If you are concerned about running out or memory, uncheck this box.
Click OK button to save your settings.