threejs-shaders

To create custom GLSL shaders in Three.js, you implement vertexShader and fragmentShader strings and wire them into a ShaderMaterial with uniforms to drive dynamic visuals. This provides fine-grained control over rendering and fragment-level effects.

Yes, you can extend built-in Three.js materials by leveraging the onBeforeCompile function to inject custom uniforms and modify shader code at runtime. This allows you to add procedural visuals without rewriting material logic from scratch.

Uniforms are variables passed from JavaScript into your GLSL ShaderMaterial that allow you to dynamically control visual effects. You define them in the material's uniforms object and reference them in your vertex and fragment shaders.

The best way to organize and reuse GLSL shader code in Three.js is by using external GLSL includes and Shader Includes. This allows you to compose complex effects by sharing common patterns across multiple shaders.

Yes, Three.js ShaderMaterial works across both desktop and mobile web-based 3D applications. You can create procedural visuals and unique materials using GLSL shaders that render properly on mobile WebGL contexts.

You use onBeforeCompile instead of ShaderMaterial when you want to inject custom shader code into existing built-in materials while retaining their default lighting and rendering logic. ShaderMaterial is used when you need entirely custom rendering from scratch.