SDF Rectangle

Practice core GLSL math building blocks used across shaders.

Overview

• Follow the steps to complete the exercise.

Learning Objectives

• Understand the math behind the effect

Prerequisites

• uv-coordinates

Key Concepts

• vUv is normalized UV in [0,1].

vec2 uv = vUv;

• Build a soft mask with smoothstep.

float m = 1.0 - smoothstep(r, r + aa, d);

• Distance fields with length/distance.

float d = length(uv - 0.5);

How To Implement (Step-by-step)

• Start from vUv.
• Compute a distance value for masks/shapes.
• Build a soft mask with smoothstep().

Self-check

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

Common Mistakes

• Make sure edge0 < edge1 for smoothstep().