# Data Types\Boolean\ Expression

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This node can be used to generate values (true or false) that can

trigger events throughout the interactive experience.[![WIEimage.png](https://simlab-soft.com/help/uploads/images/gallery/2025-09/scaled-1680-/wieimage.png) ](https://simlab-soft.com/help/uploads/images/gallery/2025-09/wieimage.png)

#### Example

In the example below when "**3DGeom-7**" is clicked, the expression in "**Evaluate Boolean Expression**" node is checked to execute the node after or not. In this case the expression is simple "**==**" which is true, so the "**3DGeom-7**" geometry will be set to Grabbable.

[![image.png](https://simlab-soft.com/help/uploads/images/gallery/2025-09/scaled-1680-/GCtimage.png)](https://simlab-soft.com/help/uploads/images/gallery/2025-09/GCtimage.png)