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Hi,
<br> The original marching cubes paper was:
<p>W. Lorensen and Cline H.E., Marching Cubes: A high-resolution
3D surface construction algorithm, SIGGRAPH 87 Conference Proceedings,
<i>Computer Graphics</i>, Vol 21, No. 4, July 1987, pp 163-169.
<p>The error in the original algorithm which could result in cracking was
resolved by:
<p>G.M. Nielson and B. Hamann, The asymptotic decider: Resolving the ambiguity
in marching cubes, in Proceedings of Visualization '91, IEEE Computer Society
Press, Los Alamitos, California, 1990, pp 83-91.
<p> - Gary Graf</html>