---
title: semantic
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/lowlevelmesh/attribute/semantic
---

# semantic

The semantic of the vertex attribute, which describes how you want RealityKit to interpret the attribute.

## Declaration

```swift
var semantic: LowLevelMesh.VertexSemantic
```

## Discussion

Discussion RealityKit consults the vertex semantic when interpreting the data in your LowLevelMesh. For example, an attribute with the semantic value of LowLevelMesh.VertexSemantic.position uses to determine the position of a vertex.

## See Also

### Describing an attribute

- [format](realitykit/lowlevelmesh/attribute/format.md)
- [offset](realitykit/lowlevelmesh/attribute/offset.md)
- [layoutIndex](realitykit/lowlevelmesh/attribute/layoutindex.md)