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implicit-mesh

implicit-mesh

create simplicial complex meshes from an implicit function

example

var build = require('implicit-mesh')
var mesh = build(64, function (x,y,z) {
  return x*+ y*+ z*- 0.2
})
console.log(JSON.stringify(mesh))

or using a shader:

var build = require('implicit-mesh/shader')
var mesh = build(64, `
  float surface (vec3 p) {
    return length(p) - 0.5;
  }
`)
console.log(JSON.stringify(mesh))

either way, you can use meshview:

$ electron-spawn shader.js | meshview
$ node js.js | meshview

sphere

api

var js = require('implicit-mesh')
var shader = require('implicit-mesh/shader')

var mesh = js(opts, fn)

Build a 3d mesh with resolution opts.size from an implicit function fn(x,y,z).

If opts is a number of array, it is interpreted as the opts.size.

opts.size can be a number or an array of numbers, one for each coordinate.

The f(x,y,z) coordinates are in the domain [-1,1] and the resulting mesh coordinates are in the range [-1,1] in each dimension.

simplicial complex meshes have:

  • mesh.positions - an array of position arrays
  • mesh.cells - an array of arrays of position indicies comprising a face

To get the surface normals you can use the [angle-normals][2] package:

var angleNormals = require('angle-normals')
var normals = angleNormals(mesh.cells, mesh.positions)

var mesh = shader(opts, src)

Build a mesh from a glsl function defined in the string src and:

  • opts.size - resolution to sample the implicit
  • opts.precision - default: 'medium'

You should define a function float surface(vec3 pos).

install

npm install implicit-mesh

license

BSD