# Defining Logic

There are 3 main use cases for realvirtual.io - Simulation, Virtual Commissioning and using the 3D Digital Twin in parallel with a real machine as a 3D HMI.

For the use case simulation (but maybe also in some special cases also for the other usecases) you might want to implement your own custom logic. There are several ways for doing that, [Logicsteps](/components-and-scripts/defining-logic/logicsteps.md), [Unity Scripting](/components-and-scripts/defining-logic/unity-scripting.md), [https://github.com/game4automation/doc/blob/doc/components-and-scripts/defining-logic/broken-reference/README.md](https://github.com/game4automation/doc/blob/doc/components-and-scripts/defining-logic/broken-reference/README.md "mention") and [Unity Visual Scripting](/components-and-scripts/defining-logic/unity-visual-scripting.md).


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