Checkerboard Pattern

Combine the mod() function with floor() to generate a black and white checkerboard texture.

Overview

• Implement a horizontal gradient using UV as the factor.

Learning Objectives

• Understand how the floor() function rounds down and the mod() function calculates the modulus.
• Learn how to control the size of the checkerboard by scaling UV coordinates.
• Master the logic of distinguishing different squares by using mod(sum, 2.0) on the result of floor(uv.x) + floor(uv.y).
• Be able to generate checkerboard patterns with custom colors and sizes.

Prerequisites

• uv-coordinates
• step-function-mask

Key Concepts

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

float t = vUv.x;
vec3 color = vec3(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.