http://lucene.apache.org/lucene-parent/lucene-spatial3d: Lucene Spatial shapes implemented using 3D planar geometry (The Apache Software Foundation) 
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Shapes implemented using 3D planar geometry.  This package has no dependencies aside from Java.
This code was contributed under the name "Geo3D".

/**
 * Shapes implemented using 3D planar geometry.  This package has no dependencies aside from Java.
 * This code was contributed under the name "Geo3D".
 */
package org.apache.lucene.spatial3d.geom;