Simulation Core

Each Project in the Tygron Engine features its own Simulation Core, which is responsible for updating the Excel file, managing Triggers, and handling grid Overlays.

• An update is initiated by a User, an API call, or when the state changes, such as the addition of a new building, while "auto update" is enabled.
• Triggering a full RESET indicators also executes step 1.
• Note that the initial New Project Wizard must be finished before updates can occur.

Iterations

The Setting ITERATIONS determines how many times this processes is repeated from step 2.

Steps

Below is an overview of each step involved:

1 Simulation models for Overlays are created and most attributes are initialized. For example the Water model initialized if groundwater is active or not. Also the Excel files are initialized and X-queries are created.

2 The API Triggers (with timing BEFORE) are executed.

3 Then all UPDATE queries (with timing BEFORE) in the Excel files of Indicators and Panels.

4 After these initial update to e.g. building attributes etc the rasterization starts. All polygon data (buildings, terrains, areas, etc) is converted into grid data. This process is shared by all active Overlays for faster execution and is also the reason why all active Overlays must have the same cell size.

5 The Simulation models now contains the required grid data and may do some additional validation on them. For example are there no elevation values above 10.000 meters.

6 The Simulation model schedules jobs that are executed either on an GPU Cluster or regular CPU. The jobs are scheduled in such a way that prequel Overlays will be executed before the receiving Overlay.

7 When all jobs have finished the Simulation model compresses the resulting data into a compact format which is stored in the Overlay.

8 Then all UPDATE queries (with timing AFTER) in the Excel files of Indicators and Panels.

9 The Indicators, Panels and Globals are updated.

10 The API Triggers (with timing AFTER) are executed.

11 Finally execution times are stored and the update envelope is reset.

=> When the project contains multiple iterations the process is restarted at step 2 and loops untill all iteration have been completed.