Controls updates of animation expressions, constraints, construction history and locators.

By default the history updates is switched off during transformation. Current machines with powerful processors, can handle most of the history updates on the fly during transformation. Try switching on the option. It can be switched off if the updates take too long.

The advantages of interactive feedback while modeling is of tremendous value. For example, while using the Align function, the modifier CVs of the master can be tweaked and the effect on the aligned surface is instantaneous and interactive. The feedback is also valuable for beginners to understand surface modifications.







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