> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cyberwave.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Disabling Collision on a Twin

> Make a twin visible but non-solid, in the editor and in simulation.

<Note>This page is a stub. A human will curate and expand it before publishing.</Note>

Some twins are there to be seen, not to be hit — a floor marking, a reference
model, a piece of scenery a robot is meant to drive straight over. **Disable
collision** makes a twin non-solid while keeping it fully visible.

## Where to set it

Select the twin in the environment editor, open the **Appearance** section, and
turn on **Disable collision**. The summary chips above the section show
**Collision off** while it is set.

## What changes

* **The visual mesh still renders.** Disabling collision never hides the twin.
* **Other twins pass through it** in the editor's physics preview.
* **Exported simulation scenes agree.** The twin's collision shapes are still
  exported, but they take part in no contact, so nothing collides with it in
  MuJoCo either.

## Things worth knowing

* **This is per twin, not per asset.** Two twins of the same asset can differ;
  the catalog asset is unchanged.
* **It is not a fix for a bad collision mesh.** If a twin blocks more space than
  its shape suggests, the cause is usually a coarse collision shape in the
  asset. Disabling collision hides that rather than correcting it — prefer
  fixing the asset's collision geometry when other objects need to interact
  with it at all.
* **It is independent of Fixed base.** Fixed base decides whether a twin *moves*
  under physics; disable collision decides whether anything can *touch* it.
* **A free-base twin with collisions off falls through the floor.** Nothing can
  stop it, including the ground. Use it on fixed-base twins, or on twins whose
  pose is driven rather than simulated.