---
title: curveBasis
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtlaccelerationstructurecurvegeometrydescriptor/curvebasis
---

# curveBasis

The basis function for the curve geometry.

## Declaration

```swift
var curveBasis: MTLCurveBasis { get set }
```

## Discussion

Discussion The default value is MTLCurveBasis.bSpline.