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    <p>Bear in mind that voxels are just a concept. There are several ways of handling them as data, and several ways of visualizing them (extract geometry, raycasting, ...).</p> <p>It's a data point in a fixed-spaced grid, that's it. What this point represents or which geometric primitive you associate with it, that's totally implementation-specific. People usually visualize them as cubes occupying the entire cell in the fixed space grid, that's why you associate them with cubes.</p> <p>The most famous/popular voxel-based application, Minecraft, visualizes them using the standard rasterization pipeline as cubes centered on a grid. (Academic) Systems like GigaVoxels perform ray-tracing into a Sparse Voxel Octree structure to generate images.</p> <p>I've encountered the following voxel-oriented libraries:</p> <ul> <li><strong>Field3D</strong>: Sony Pictures library for storing voxel data: <a href="http://opensource.imageworks.com/?p=field3d" rel="noreferrer">http://opensource.imageworks.com/?p=field3d</a></li> <li><strong>OpenVDB</strong>: A new format released by Dreamworks Studios: <a href="http://www.openvdb.org/index.html" rel="noreferrer">http://www.openvdb.org/index.html</a></li> <li><strong>Polyvox</strong>: Used for several games, in active development: <a href="http://www.volumesoffun.com/polyvox-download/" rel="noreferrer">http://www.volumesoffun.com/polyvox-download/</a></li> <li><strong>VoxelIQ</strong>: Game-oriented block-based engine in C# - <a href="https://github.com/raistlinthewiz/voxeliq" rel="noreferrer">https://github.com/raistlinthewiz/voxeliq</a></li> <li><strong>GigaVoxels</strong>: Ray-guided streaming library for voxels - <a href="http://gigavoxels.imag.fr/" rel="noreferrer">http://gigavoxels.imag.fr/</a></li> <li><strong>Binvox</strong>: Not really a library, but a voxelizer with a basic binary voxel data definition: <a href="http://www.cs.princeton.edu/~min/binvox/" rel="noreferrer">http://www.cs.princeton.edu/~min/binvox/</a></li> <li><strong>VoxelFarm</strong>: An engine for generating procedural voxel terrain: <a href="http://www.voxelfarm.com/vfweb/engine.html" rel="noreferrer">http://www.voxelfarm.com/vfweb/engine.html</a></li> </ul> <p>And here's a reddit post with 20 years of voxel engine code: <a href="https://www.reddit.com/r/VoxelGameDev/comments/3fvjb4/20_years_of_voxel_engines_source_code_included/" rel="noreferrer">https://www.reddit.com/r/VoxelGameDev/comments/3fvjb4/20_years_of_voxel_engines_source_code_included/</a></p>
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    1. CO+1 for Minecraft.
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      1. USMarc Claesen
 

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