Adjust Flat Triangle Setting - Surface Modeling Work Processes

This question comes up a fair bit so I wanted to explain how it works. A surface once formed has a set of properties that can be reviewed. These properties are derived initially from the Project Settings - Computations - Surfaces function which defines the defaults for all new surfaces that get created. The Adjust Flat Triangles setting can be set to No or Yes. If set to Yes you are asked for a tolerance - the default is 1’ or 30cm. So what does this do and what is the tolerance value. This

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