perlin noise experimentations

This is a simple project to experiment with perlin noise. The project is written in c++ using X11 for the windowing system. There are 7 different way to generate images using perlin noise built-in the project:

• cloud effects using 2 superposed perlin noise
• 2 graph representation of perlin noise in 2D
• marble effect
• wood effect
• one effect that I don't know how to describe
• procedural landscape

usage:

# clone:
git clone https://github.com/lohhiiccc/Noise-generator
# compile:
make
# run:
./perlin

how to use it:

• press space bar to change the effect
• press escape to quit the program

dependencies:

• X11
• g++
• make

how it works:

The project is divided in 3 main parts:

• the noise generation
  • cache pseudo-random gradient vectors based on seed
  • cut the image in a grid of cells
  • for each cell, generate a pseudo-random gradient vector
  • for each pixel in the cell, calculate the distance to the 4 corners of the cell and interpolate the gradient vectors
• the image generation
  • image are basically 2D array of uint32_t
• the x11 windowing system
  • open a connection to the X server
  • get a default root window
  • define window properties
  • create the main window
  • event handling
    • key press event
      • quit the program with escape key
      • change the effect with space bar
    • close window event

How to add effects:

• create effect function in effects folder
• follow the same pointer function signature as the other effects int (*name)(uint32_t *image, bool &needUpdate)
• add the effect in the main.cpp file by adding the function pointer in the vector of function pointers window.load_render(<new_effect_name>);
• make again the project !

some visual examples:

cloud effect:

graph representation:

second graph representation:

marble effect:

wood effect:

procedural landscape:

unknown effect:

real usage of perlin noise:

• perlin noise is a random noise that is coherent, meaning that the noise is smooth and continuous
• this property makes perlin noise very useful in procedural generation
• in computer graphics and video games, perlin noise is used to generate textures, terrain, clouds, particles, etc...
• the advantage of perlin noise is that you can reduce the weight of your assets by generating them on the fly

author:

• @lohhiiccc

this is my first project with X11, i may have done some things wrong, feel free to tell me how to improve it.