Introduction

Perlin noise 2D implementation written in C.

Documentation

int perlin2d(float * grid, size_t height, size_t width, unsigned int t, float a, unsigned int seed);

Arguments

• grid: pointer to the memory block were the result will be stored. Must be of size height * width * sizeof(float).
• height: height of the image to generate.
• width: width of the image to generate.
• t: period of random vector generation. Noise frequency = 1/t.
• a: amplitude of the noise.
• seed: seed used for RNG.

Returns

• 1 if everything worked.
• 0 if could not allocate memory for random vectors

Benchmark

Generated the following image with size 4096x4096 and T = 64 in 0.23 seconds on a i7-4770k.

Example

The code in the folder example generates five noise images, adds them to generate fractal noise and writes the result as a txt file. There is a Python script included to visualize de result.

To use the example, cd into the example folder and run:

make
./test
python3 view.py

For the Python visualization script to work, requires Numpy and Matplotlib.