rle-mesh

rle-mesh

Mesh and surface extraction routines for narrow band level sets. It is part of the rle family of modules.

Installation

Via npm:

npm install rle-mesh

Example

Here is how you can create a mesh for a solid object:

var volume = require("rle-sample").solid.dense([-6,-6,-6], [7,7,7], function(x) {
  return Math.sqrt(x[0]*x[0]+x[1]*x[1]+x[2]*x[2]) - 5.0;
});
var mesh = require("rle-mesh")(volume);

This creates a mesh that looks like this:

You can also view the demo in your browser here

rle-mesh can also handle multiphase level sets too. Here is a more complicated example:

function sphere_dist(x) {
  return Math.sqrt(x[0]*x[0]+x[1]*x[1]+x[2]*x[2]) - 5.0;
}
var volume = require("rle-sample").dense([-6,-6,-6], [7,7,7], function(x) {
  if(sphere_dist(x) < 0) {
    if(x[0] < 0) {
      return 1;
    }
    return 2;
  }
  return 0;
}, sphere_dist);
var mesh = require("rle-mesh")(volume);

This creates a sphere with two distinct phases:

Again, you can also look at the result in 3D using your web browser.

require("rle-mesh")(volume[, lo, hi, solid_func])

The main meshing method takes the following parameters:

• volume: An RLE volume
• lo: (Optional) Lower bounds on the volume to extract
• hi: (Optional) Upper bounds on the volume to extract
• solid_func: (Optional) A predicate that determines whether or not to display a voxel phase

Returns: An object with the following properties

• positions: An array of length 3 arrays representing the position of each vertex.
• faces: An array of length 3 arrays representing the indexed faces of the mesh
• phases: An array of length 2 arrays the same length as faces that has the phase on the front and back of each face.

Credits

(c) 2013 Mikola Lysenko