Two-Color Blended Gradient

Achieve a left-to-right two-color gradient effect on the screen through linear interpolation, mastering the basics of blending and UV coordinates in GLSL.

Overview

• Implement a horizontal gradient using UV as the factor.

Learning Objectives

• Understand the application of linear interpolation (mix function) in color blending.
• Learn how to use the x-component of UV coordinates to control the gradient direction.
• Master creating simple two-color horizontal gradient effects.
• Understand how colors are represented and manipulated in GLSL.

Prerequisites

• uv-coordinates
• solid-color

Key Concepts

• A horizontal gradient uses a 0-1 factor (usually UV) to blend colors.

float t = vUv.x;
vec3 color = mix(colorA, colorB, t);

• Keep the factor inside [0,1].

t = clamp(t, 0.0, 1.0);

How To Implement (Step-by-step)

• Set factor: t = vUv.x.
• Map t to a color (grayscale or mix).
• Output gl_FragColor with alpha=1.

Self-check

• Does it compile without errors?
• Does the output match the goal?
• Are key values kept in [0,1]?

Common Mistakes

• Clamp t into [0,1] when needed.