React Three Fiber retro dithering and shader styling
Implement custom post-processing effects in React Three Fiber using dithering, color quantization, and fragment shaders to give modern Web 3D scenes a unique retro aesthetic.
Hacker Newsmichael-sumner
React Three Fiber@react-three/fiber@react-three/postprocessingpostprocessingThree.jsWebGLGLSL
Added 2026-10-31 · originally published 2026-10-13
Key points
- Apply custom shaders to rendered 3D scenes using post-processing, much like adding a filter to a photo.
- Understand the difference between Passes and Effects: Passes can be stacked but remain separate, while Effects can be merged into a single Effect Pass to improve performance.
- Extend the Effect class and define fragment shaders and uniforms in the superclass constructor, then use wrapEffect from @react-three/postprocessing to wrap it as a JSX component.
- Implement brightness-based white noise dithering: sample pixel brightness, compare it with random numbers, and output black and white pixels.
- Use the mainImage function (which receives inputColor and uv) in custom fragment shaders, and output results by setting the outputColor variable without directly manipulating gl_FragColor.
Pitfalls
- Writing complex shaders without considering post-processing performance overhead and failing to leverage Effect Merging.
- Incorrectly using a traditional main function and gl_FragColor instead of mainImage and outputColor in the fragment shader of a custom post-processing effect.
.cursorrules
- Prioritize Effect Merging to improve post-processing performance. - Custom effects must extend the Effect class from postprocessing. - Use the mainImage(const in vec4 inputColor, const in vec2 uv, out vec4 outputColor) structure in fragment shaders, outputting via outputColor rather than directly setting gl_FragColor.
Copy-ready prompt
Please implement a custom retro dithering post-processing effect for [component name] in a React Three Fiber project. Use wrapEffect from @react-three/postprocessing and the Effect class from the postprocessing library. Write a fragment shader that implements white noise dithering logic based on pixel brightness and random numbers, using the mainImage function and the outputColor variable to output the final effect.
#Frontend Styling#WebGL#React Three Fiber#Shader
Related techniques
Summarized by AI from the original source - refer to the original post for details. Copyright belongs to the original author.