Summing Blue Noise Octaves Like Perlin Noise
I haven’t made many blog posts this year, due to working on a project at work that I just got open sourced. The project is called Gigi and it is a rapid prototyping and development platform for real time rendering, and GPU programming. We’ve used it to prototype techniques and collaborate with game teams, we’ve used it in published research (FAST noise), and used it to generate code we’ve shared out into the world.
I also used Gigi to do the experiments and make the code that go with this blog post. Both the Gigi source files and the C++ DX12 code generated from those Gigi files are on github at https://github.com/Atrix256/BNOctaves.
Nikita tagged me in this interesting post with a neat looking screenshot. I thought this was interesting and wanted to look deeper so got the details.
The idea is that you start with a blue noise texture. You then add in another blue noise texture, but 2x bigger and multiplied by 1/2. You then add in another blue noise texture again, but 4x bigger, and multiplied by 1/4. Repeat this as many times as desired. While doing this process you sum up the weights (1 + 1/2 + 1/4 + …) and you divide the result by the weight to normalize it.
