I have tried about twenty different polygon reducers and untriangulators. I am in the process of writing a tutorial on polygon reduction, with links to all the free reducers and untriangulators, and a review of each. If you want to spend money and do a really good job, the best in my opinion are: For triangulated models, the best reducer is Rational Reducer. It has the best algorythms and keeps the best detail out of all the untriangulators I tried. It has preview functions, mesh overlays and other tools to help you compare the results, and you can fine tune percentages. To untriangulate a model, I think Cinema4D does the best job. You can set the evaluation angle, and also untriangulate only certain parts or areas. Both of these cost money though. If anyone else has any better results than these, please let me know so that I can include it in the tutorial.

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