GLSL weird banding

[JS_Schnubb]

Hi, I am currently learning glsl and have started the book of shaders. Everything was going fine until I got to the last chapter available fractal brownian motion The Book of Shaders: Fractal Brownian Motion. When I copy the last exemple in TD there’s a weird kind of shape banding effect. I tried on another windows pc and the same thing appears. I also tried on a macbook and it is normal like the website. I found some ways to cancel the unwanted effect but I really want to wrap my head around this one and the original code is way better looking.

Thank you

[GauthierDewez]

Hey I noticed the same thing a few days ago and found this workaround : I used the built in TDsimplexnoise function instead of the noise function in this shader.

Write a GLSL TOP

[JS_Schnubb]

Thanks! Yes I’ve also tried this and worked well with the simplex and perlin but I do prefer the custom random function. I also changed the Angle & Trig. Function from sin to atan in the random and helped.

[raganmd]

There’s a great discussion here about this as it’s related to the use of sin()

Book of Shaders and TouchDesigner

Thanks @malcolm let me know what you hear. I can update the random function to use a smaller value to reduce this issue. I can also include an example of calling a built-in TD Noise function as well.

[JS_Schnubb]

Thank you! I will definetly take a look. Also thanks a lot for all the resources you put out there.