Geometry Utility Functions in Javascript

Synopsis

guf.js is a small collection of functions that calculate geometric properties of a mesh. The key feature it currently provides is normal calculation (face & vertex normals).

Code Example

var guf = require('guf');

var positions = [[x,y,z], [x,y,z], [x,y,z], [x,y,z], ... ];
var cells = [[i0,i1,i2], [i0,i1,i2], [i0,i1,i2], ... ];

// Vertex Normals (Left Image)
var vertexNormals = guf.vertexNormals( positions, cells ) );

// Face Normals (Right Image)
var facePositions = [];
var faceNormals = [];

for( var i = 0; i < cells.length; i++ ) {
  var a = positions[ cells[ i ][ 0 ] ];
  var b = positions[ cells[ i ][ 1 ] ];
  var c = positions[ cells[ i ][ 2 ] ];
  var n = guf.calculateNormal( a, b, c );  
  facePositions.push( a, b, c );
  faceNormals.push( n, n, n );
}

Motivation

This library is part of a larger project / series of libraries that aspires to bring computational and parametric design to the web. This library helps render meshes so you can see if your mesh's normals are oriented properly. This is useful in applications that enable higher level computational design, 3d printing, g-code generation, cnc milling tool path creation, laser cutting paths, robotic motion planning, and more.

Build Requirements

node.js (4.4.0+) & npm

Installation

You can add this library to your project by running:

npm install --save https://github.com/YCAMInterlab/guf.js.git

or via npm:

npm install --save guf

Examples

See https://github.com/rezaali/webgl-sketches/tree/master/hull

Contribution

Copyright 2015-2016 Reza Ali co-developed by YCAMInterLab during the Guest Research Project v.3

License

Apache-2.0