About this Video

• Video Title: Three.js Project: TSL Rainbow Shader
• Channel: Robot Bobby
• Speakers: Robot Bobby
• Duration: 00:17:27

Introduction

This video demonstrates how to create a rainbow shader effect using Three.js's TSL (Three.js Shading Language) instead of GLSL. The speaker refactors a pre-existing GLSL shader, migrates it to use the WebGPU renderer, and then implements the same effect using TSL, comparing the code lengths and functionality of both approaches.

Key Takeaways

• The video showcases a migration from GLSL to Three.js's TSL (Three.js Shading Language) for shader development.
• It highlights the advantages of TSL, including writing shaders directly in JavaScript within the Three.js scene and runtime compilation.
• The process involves switching the renderer from WebGL to WebGPU, requiring adjustments to the animation loop and shader material handling.
• The speaker demonstrates creating a rainbow effect, manipulating color bands and saturation using TSL functions and variables.
• A comparison is made between the code lengths of the GLSL and TSL versions, showing TSL's potential for conciseness.

Based on the transcript, positionLocal is described as the local variable for position within the TSL shader. It's a vec3 (a three-component vector) representing the X, Y, and Z positions along the surface of the rendered object, encoding these positions as RGB values to determine color. The speaker explains that using positionLocal in the fragment node essentially assigns a color based on the object's surface position.