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Eigen library (http://goo.gl/cV5LY), which is used extensively in ROS and PCL.

Thank you.

Neel
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2 Answers2

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https://stackoverflow.com/questions/21761909/eigen-convert-matrix3d-rotation-to-quaternion

Welcome neel, please take the time to look around and contribute to other questions.

hauptmech
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Eigen has a Quaternion constructor that takes a rotation matrix.

Ben
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