# generateCollisionShapes(recursive:static:) Creates the shape used to detect collisions between two entities that have collision components. ``` @MainActor @preconcurrency func generateCollisionShapes(recursive: Bool, static isStatic: Bool) ``` ## Parameters `recursive` A Boolean that you set to `true` to also generate the collision shapes for all descendants of the entity. If a descendant is in a `LevelOfDetailComponent`’s level and is not the base level it will be skipped. `isStatic` A Boolean value that indicates whether the colliders move. Set this to `true` to indicate the colliders don’t move. Non-moving, static colliders are more efficient to use than non-static ones. ## Discussion Call this method on entities that have a mesh to prepare a shape used for collision detection. The method stores the shape in the entity’s [`CollisionComponent`](/documentation/RealityKit/CollisionComponent) instance. This method has no effect for entities without a mesh. Nevertheless, the method is defined for all entities so that you can call it on any entity, and have the calculation propagate recursively to all that entity’s descendants. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)