### Description
This example loosely follows the most excellent paper by Curless and
Levoy: ["A Volumetric Method for Building Complex Models from Range
Images."](https://graphics.stanford.edu/papers/volrange) First it
estimates normals from the points, then creates a signed distance
field, followed by surface extraction of the zero-level set of the
distance field.

The image was created using the [Armadillo
dataset](https://github.com/lorensen/VTKWikiExamples/blob/master/Testing/Data/Armadillo.ply?raw=true)

This is a demo version of [ExtractSurface](ExtractSurface). It displays some a sampling of the normals with arrows. It also uses a different color for the front and back surfaces.

**NOTE:** The classes used in this example require vtk 7.1 or later.

