Experimental: This Feature is currently experimental and is subject to change in later major versions.
# Sample Mesh Index
**Menu Path : Operator > Sampling > Sample Mesh Index**
**Menu Path : Operator > Sampling > Sample Skinned Mesh Renderer Index**
The Sample Mesh or Skinned Mesh Renderer Index Operator allows you to fetch index buffer data of geometry. Both [UInt16](https://docs.unity3d.com/ScriptReference/ModelImporterIndexFormat.UInt16.html) and [UInt32](https://docs.unity3d.com/ScriptReference/ModelImporterIndexFormat.UInt32.html) format are supported the output of this operator is always an UInt.
## Operator settings
| **Property** | **Type** | **Description** |
| ------------ | -------- | ------------------------------------------------------------ |
| **Source** | Enum | Choose the kind of geometry to sample, either a **Mesh** or a **Skinned Mesh Renderer** |
### Operator properties
| **Input** | **Type** | **Description** |
| ------------------------- | --------------------- | ------------------------------------------------------------ |
| **Mesh** | Mesh | The source mesh asset to sample.
This property only appears if you set **Source** to **Mesh** |
| **Skinned Mesh Renderer** | Skinned Mesh Renderer | The source Skinned Mesh Renderer component to sample. This is a reference to a component within the scene. To assign a Skinned Mesh Renderer to this port, create a Skinned Mesh Renderer property in the [Blackboard](Blackboard.md) and expose it.
This property only appears if you set **Source** to **Skinned Mesh Renderer** |
| **Index** | Uint | The index offset to sample the current index buffer. |
| **Output** | **Type** | **Description** |
| ---------- | -------- | ------------------------------------------------------------ |
| **Index** | UInt | The sampled index, or zero if input **Index** is out of bounds. |
#### Limitations
The Mesh index sampling feature has the following limitations:
- If a Mesh is not [readable](https://docs.unity3d.com/ScriptReference/Mesh-isReadable.html), the **Position (Mesh)** Block and **Sample Mesh Index** Operator return zeros values when they attempt to sample it. For information on how to make a Mesh readable, see [Model import settings](https://docs.unity3d.com/Manual/FBXImporter-Model.html)
