capstan 0.0.1

NURBS library with a CAD focus
Documentation 
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# Capstan

![GitHub Rust CI](https://github.com/lancelet/capstan/workflows/Rust/badge.svg)

NURBS utilities in Rust.

## NURBS Curve Evaluation

Currently, only NURBS curve evaluation is complete. The evaluation uses a
naive version of the de Boor algorithm. With this, it's possible to evaluate
the 3D coordinates of a NURBS curve at any parameter value.

NURBS can represent conics with floating-point precision. This image shows a
tesselated NURBS circle on the left and an SVG circle on the right:

<img src="./diagrams/circle.svg" width="600" height="300"/>

NURBS are a generalization of Bézier curves, so they can exactly represent any
order of Bézier curve. The image below shows an SVG cubic Bézier with a loop on
the right and a tesselated NURBS representation on the left:

<img src="./diagrams/cubic-bezier.svg" width="600" height="300"/>

## NURBS Curve Representation

The library uses the "Rhino" form of NURBS curves, where there are two fewer
control points than in "traditional" NURBS.