---
title: triangleFillMode
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/simplematerial/trianglefillmode-swift.property
---

# triangleFillMode

The object that controls how RealityKit draws triangles.

## Declaration

```swift
var triangleFillMode: SimpleMaterial.TriangleFillMode { get set }
```

## Discussion

Discussion A value of MaterialParameterTypes.TriangleFillMode.fill causes RealityKit to draw triangles normally, while a value of  MaterialParameterTypes.TriangleFillMode.lines turns on wireframe rendering.