Noise Texture

Learn how to generate and use noise functions to create organic textures.

Learning Objectives

- Understand pseudo-random number generation in shaders

- Learn to create noise functions from scratch

- Practice using noise for texture generation

Key Concepts

Pseudo-Random Functions

Create randomness using mathematical functions:

`glsl

float random(vec2 st) {

return fract(sin(dot(st.xy, vec2(12.9898,78.233))) * 43758.5453123);

}

`

Noise Generation

Build noise by:

1. Creating random values at grid points

2. Interpolating between neighboring values

3. Combining multiple octaves for detail

Texture Applications

Use noise for:

- Surface textures (wood, marble, clouds)

- Displacement mapping

- Animated effects

Exercise

Create a noise-based texture that resembles organic patterns like clouds or marble.

Hints

1. Start with a basic random function

2. Scale UV coordinates to control noise frequency

3. Use smoothstep() or mix() for smooth interpolation

4. Experiment with different scaling factors

Expected Result

You should see an organic, cloud-like texture with smooth variations across the screen.