Why do people use sqrt(dot(distanceVector, distanceVector)) over OpenGL's distance function?

Doing essentially the same thing, people often choose the sqrt option for one of two reasons: 1. They don't know about/remember the distance function 2. They are trusting themselves and their own math to prove that is not a problem to cause a bug (avoiding OpenGL problems)

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Opengl Es

Shader

Glsl

Webgl

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