This package provides 2 new Core Image filters for creating "smooth noise". The filter kernels are written in Metal Shading Language for maximum performance. They require a GPU-accelerated CIContext in order to run.
A Metal-based implementation of the 3D Simplex noise generation algorithm. It produces monochromatic noise that varies smoothly in the range [0…1]. Visually, it resembles the ripples on the surface of water.
Note: The extent produced by this filter is infinite, so you'll need to crop it or use a fixed rendering rect as shown in the usage example.
let ciContext = CIContext(...) // Set up using Metal.
let filter = SimplexNoiseGenerator()
filter.contrast = 2.0 // Do any parameter changes you want.
guard
let output = filter.outputImage,
let result = ciContext.createCGImage(
output,
from: CGRect(x: 0, y: 0, width: 512, height: 512)
)
else { fatalError("Could not render.") }
// result is a CGImage which can be converted into a UIImage, NSImage, or Image
// depending on your platform.
This filter composes multiple "octaves" of Simplex Noise to create a more complex texture, while still retaining the overall smooth transitions. As with the SimplexNoiseGenerator, it produces values that vary smoothly in the range [0…1]. Visually, it resembles terrain or clouds.
Note: The extent produced by this filter is infinite, so you'll need to crop it or use a fixed rendering rect as shown in the usage example.
let ciContext = CIContext(...) // Set up using Metal.
let filter = FractalNoiseGenerator()
filter.contrast = 2.0 // Do any parameter changes you want.
filter.octaves = 2
guard
let output = filter.outputImage,
let result = ciContext.createCGImage(
output,
from: CGRect(x: 0, y: 0, width: 512, height: 512)
)
else { fatalError("Could not render.") }
// result is a CGImage which can be converted into a UIImage, NSImage, or Image
// depending on your platform.
Created by combining Fractal Noise with a radial gradient to create constrained island groups. Color map sampled from satellite photography of Wake Island.
