# Occurrence Properties

> The properties of occurrences in Asset Transformer Studio

![Occurrence properties in Inspector](/api/media?file=/asset-transformer-studio/2026.5.0/media/STUDIO_Windows_Inspector-Properties.jpg)

An occurrence carries *properties*, which can be viewed and used through the [Inspector](../../user-interface/window/inspector) panel, or using Python scripting.

There are 3 types of properties:

## Default properties

An occurrence has 6 default properties:

* `Id`: Is a unique numerical identifier that identifies each occurrence of a scene
* `Name`: Defines the name of the occurrence, as it is displayed in the [Product Structure](../../user-interface/window/product-structure-tree) panel, and at the top of the [Inspector](../../user-interface/window/inspector) panel when selected
* `Visible`: Defines the visibility of the occurrence in the scene
* `Material`: Defines the material assigned to the occurrence
* `Transform`: Defines the position of the occurrence in the scene (transformation matrix)
* `Prototype`: Defines if the occurrence is an instance from another occurrence (which is its prototype: see [About Instances & Prototypes](../about-instances-and-prototypes))

## Metadata properties

A CAD/3D model can contain occurrences in its Product Structure that carry additional, non-geometric data, often called [metadata](../glossary) in the CAD world.

These metadata were added to the CAD model directly in the software where it was created, and are retrieved at import in Asset Transformer Studio.

They are stored as properties in the Metadata Component, which is automatically created at import.

![Metadata component](/api/media?file=/asset-transformer-studio/2026.5.0/media/STUDIO_ComponentMetadata.png)

## Custom properties

`Custom properties` can be added to an occurrence by the user through the user interface ([Inspector](../../user-interface/window/inspector) panel) or using Python scripting.

> **Note:**
>
> Custom Properties are listed in the `Other Properties` folder of the [Inspector](../../user-interface/window/inspector) panel.

## Related topics

* [About the Product Structure (Tree)](../about-the-product-structure-tree)
* [Occurrence Components](./occurrence-components.md)