Disclaimer: This internal technical report provides an interim overview of my Surface Extraction project at Maptek, outlining key methods. Certain proprietary details and recent developments are excluded in accordance with confidentiality agreements.

Abstract: Surface extraction from implicit neural representations modelling a single class surface is well-understood. This report introduces a boundary extraction algorithm for multi-class implicit representations that guarantees topological consistency and watertightness while allowing control over the polygonal approximation detail. We evaluate the method using geological modelling data, demonstrating adaptiveness to complex topology.

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