# Interacting with the world

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**Touching the world.** [b3d-interactive](/b3d-interactive/) makes a mesh
something you press (a door, a switch); a [trigger](/b3d-trigger/) fires when
you walk into a place; [collisions](/b3d-collisions/) are what stops you
walking through things, and [physics](/b3d-physics/) is for when things should
fall over. The [manipulator](/b3d-manipulator/) is the move, turn and scale
gizmo for editing a scene.

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- [b3d-interactive](/b3d-interactive/)
- [b3d-trigger](/b3d-trigger/)
- [b3d-collisions](/b3d-collisions/)
- [b3d-physics](/b3d-physics/)
- [b3d-beacon](/b3d-beacon/)
- [b3d-manipulator](/b3d-manipulator/)
- [portal-transform](/portal-transform/)
- [spatial-transform](/spatial-transform/)
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