Choosing angles for faceting used to be done by trial and error. There were enough faceters cutting every imaginable material that the research was fairly well done. However, there was no scientific method for comparing the data. Nor was there any systematic method of sharing the information gathered. Hence, some opinion has slipped into the published records.
With the advent of computerized ray tracing programs, this changed. Old theories have been tested and new insights were added. Many of the …
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