---
title: "init(path:extrusionDepth:)"
framework: scenekit
role: symbol
role_heading: Initializer
path: "scenekit/scnshape/init(path:extrusiondepth:)"
---

# init(path:extrusionDepth:)

Creates a shape geometry with the specified path and extrusion depth.

## Declaration

```swift
convenience init(path: UIBezierPath?, extrusionDepth: CGFloat)
```

```swift
convenience init(path: NSBezierPath?, extrusionDepth: CGFloat)
```

## Parameters

- `path`: The two-dimensional path forming the basis of the shape.
- `extrusionDepth`: The thickness of the extruded shape along the z-axis.

## Return Value

Return Value A shape geometry.

## Discussion

Discussion SceneKit determines the filled area of the path using the even-odd winding rule (see Winding Rules in Cocoa Drawing Guide) and extrudes this area to create a three-dimensional geometry. The result of extruding a self-intersecting path is undefined. The extruded shape is centered at the zero point of its z-axis. For example, an extrusion depth of 1.0 creates a shape that extends from -0.5 to 0.5 along the z-axis. An extrusion depth of zero creates a flat, one-sided shape. The path’s flatness (see flatness in NSBezierPath) determines the level of detail SceneKit uses in building a three-dimensional shape from the path. A larger flatness value results in fewer polygons to render, increasing performance, and a smaller flatness value increases the smoothness of curves at a cost to performance.