If you simply start the program without parameters it generates
a "distance to center" volume and does mc on this volume. If you want to load a data set specify the following: MarchingCubes [isoValue] [filename] [b/f for byte or float data] [sizeX] [sizeY] [sizeZ]
i.e. the engine.raw dataset will work with the following parameters: MarchingCubes 0.15 engine.raw b 256 256 128
