RayMarching#1

Preface

Using OpenGL, practicing ray marching.

Source From

• http://iquilezles.org/www/articles/distfunctions/distfunctions.htm
• http://jamie-wong.com/2016/07/15/ray-marching-signed-distance-functions/
• How to Normalize a vector: https://www.youtube.com/watch?v=7fn03DIW3Ak

Summary

• ShaderToy controls only a fragment shader

Nomenclature

ShaderToy

• fragCoord: Current fragment(pixel) position
• iResolution: The size of the frame. Equal to windows/viewport
• Signed Distance Functions(SDF): When passed the coordinates of a point in space, return the shortest distance between that point and some surface.
• Radians: Convert a quantity in degrees to radians. 2π rad = 360∘ 1rad ≒ 57.3∘
• Normalize: Calculates the unit vector in the same direction as the original vector. Divice vector by its maginitude. Therefore, new length will be 1.