# Normal to an implicit surface

How to compute the normal of a distance field (implicit surface) - 03/2018 - #Definition

\( \renewcommand{\vec}[1]{ \mathbf{#1} } \)

# Gradient rules

Multivariate calculus - differentiate expressions with nabla/gradient operator. - 01/2015 - #Definition

Just leaving some notes to differentiate expressions with the \( \nabla \) operator to compute gradients of various functions.

# Contour lines

Also called iso-lines and level curves. - 12/2013 - #Definition

## Introduction

To represent a 2D function \( z = f(x,y) \) one can draw a 3D surface. The higher the \(z\) value the higher the point on the surface (see above).

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