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Graphics/Surfaces & Meshes/Polygon reduction & LOD

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New Quadric Metric for Simplifying Meshes with Appearance Attributes
October 1999 - Hugues Hoppe

Simple Polygon Reduction
Stan Melax
This article describes a simple but effective and fast algorithm for reducing polygons in 3D meshes. The algorithm is based on the normal edge collapse used in other algorithm.

Simplifying Surfaces with Color and Textures using Quadric Error Metrics
Michael Garland, Paul Heckbert