Texture-intensive noise implementations

[couleurs]

Hi!

First off thanks a lot for this work it's been incredibly useful :)

This is not really an "issue" but I have a question for you guys about something posted in the "Wiki" and couldn't find another way to ask it. In the Wiki, you say: "However, if you are generating noise by itself and using a lot of it, the texture-intensive noise implementations this work was based on...". I'm interested in exploring those texture-based implementations to see the performance trade-offs. Is there any resource or article you recommend to get started with them?

Thanks a lot! Johan

[stegu]

The implementations are linked from the wiki on the Github repo, in the section "Other noise implementations". Here's a direct link:

http://www.itn.liu.se/~stegu/simplexnoise/GLSL-noise.zip

My first implementation of that was posted to the GLSL forum on OpenGL.org about a decade ago. It was based partly on an implementation of "Improved Noise" from Simon Green at Nividia, published in volume 2 of "GPU Gems":

http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter26.html

[couleurs]

Great, thanks! I think I got confused because that .zip file doesn't actually include the texture files. Would any noise texture be good enough or there are specific ones you're using in your implementations? Thanks!

[stegu]

The texture is generated in the code, using very little code and a couple of small arrays. It is a very particular pixel pattern with four color channels, and that particular texture is absolutely necessary for the algorithm to give the correct result. Storing the texture in a file seemed silly, seing how easy it was to generate it, but now with WebGL I see how it could be useful. I should perhaps try to revisit that old code and update it to maka a WebGL demo with a PNG texture file.

[stegu]

On second thought, I will not. Too many versions to maintain already, and too little time to do it. Closing the issue.