---
title: edgeTessellationFactor
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtltriangletessellationfactorshalf/edgetessellationfactor
---

# edgeTessellationFactor

The edge tessellation factors, with each index value providing the tessellation factor for a particular edge.

## Declaration

```swift
var edgeTessellationFactor: (UInt16, UInt16, UInt16)
```

## Discussion

Discussion The value in index 0 provides the tessellation factor for the upper-left edge of the patch. The value in index 1 provides the tessellation factor for the bottom edge of the patch. The value in index 2 provides the tessellation factor for the upper-right edge of the patch.