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A collection of 3D constraints - simple behaviors you can use like building blocks. If you have used a 3D animation package, such as Maya, Max or Softimage, you will recognize the basic constraint types, but UnityConstraints takes these further to specifically aid Unity game development by offering standardized solutions to common behaviors. For example, you won't want to code your own 'look at' solution ever again.

UnityConstraints are light-weight, efficient and designed for performance in even the most demanding situations. Most constraints update live in the Editor for what-you-see-is-what-you-get setups.

Constraint List, Documentation & Video:
constraints.path-o-logical.com