# init(vectorNoiseWithSmoothness:name:textureDimensions:channelEncoding:) Initializes a noise texture that creates random directional noise. ``` init(vectorNoiseWithSmoothness smoothness: Float, name: String?, textureDimensions: vector_int2, channelEncoding: MDLTextureChannelEncoding) ``` ## Parameters `smoothness` A value that indicates how similar neighboring texels will be in the resulting texture. The value should be between `0.0` and `1.0`. A value of `1.0` generates a smooth surface. `name` The [`name`](/documentation/ModelIO/MDLNamed/name) property for the new texture object. `textureDimensions` The texel dimensions (width and height) of the texture image. `channelEncoding` The data format for each channel value per texel—for example, 8-bit integer or 32-bit floating point. For possible values, see [`MDLTextureChannelEncoding`](/documentation/ModelIO/MDLTextureChannelEncoding). ## Return Value A new directional noise texture object. ## Discussion Unlike a color noise texture, in which the RGBA channels are independently randomized, a directional noise texture treats each texel’s RGB channels together as the XYZ components of a random direction vector, and the A channel as a scalar for the vector’s direction. This initializer does not generate texel data; the [`MDLNoiseTexture`](/documentation/ModelIO/MDLNoiseTexture) class automatically generates data and caches it for reuse when you use one of the [`MDLTexture`](/documentation/ModelIO/MDLTexture) methods listed in Accessing Texture Data. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)