main/src/georegression/struct/shapes/Box3D_F64.java
public Point3D_F64 center( Point3D_F64 storage ) {
		if( storage == null )
			storage = new Point3D_F64();
		storage.x = (p0.x + p1.x)/2.0;
		storage.y = (p0.y + p1.y)/2.0;
		storage.z = (p0.z + p1.z)/2.0;
		return storage;
	}
public Point3D_F64 center( Point3D_F64 storage ) {
		if( storage == null )
			storage = new Point3D_F64();
		storage.x = (p0.x + p1.x)/2.0;
		storage.y = (p0.y + p1.y)/2.0;
		storage.z = (p0.z + p1.z)/2.0;
		return storage;
	}
Computes and return the center of the cube.
@param storage Optional storage for the center.  If null a new instance will be created and returned.
@return The cube's center point