init(vectorNoiseWithSmoothness:name:textureDimensions:channelEncoding:)
Initializes a noise texture that creates random directional noise.
Declaration
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
0.0and1.0. A value of1.0generates a smooth surface. - name:
The 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.
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 class automatically generates data and caches it for reuse when you use one of the MDLTexture methods listed in Accessing Texture Data.