> For the complete documentation index, see [llms.txt](https://doc.realvirtual.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.realvirtual.io/components-and-scripts/collision.md).

# Collision Detection

realvirtual provides group-based collision detection for monitoring physical contacts between defined sets of objects during simulation.

## Components

| Component                                                                               | Description                                                                         | Edition      |
| --------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------- | ------------ |
| [Group Collision Checker](/components-and-scripts/collision/group-collision-checker.md) | Runtime collision detection between named groups with GPU highlight and PLC signals | Professional |

## Concept

The collision detection system builds on the [Group](/components-and-scripts/motion/group.md) component. You assign objects to named groups, then the GroupCollisionChecker monitors cross-group contacts while suppressing self-collision within each group.

This is particularly useful for:

* Detecting robot-to-machine collisions without false alarms from internal joints
* Monitoring gripper-to-fixture contact
* Safety zone violation detection
* Multi-robot workspace overlap monitoring


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