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Eigen
Eigen is a header-only C++ math library covering matrices, vectors, decompositions, sparse systems, and geometry.
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Why use it
Physics tools, animation solvers, procedural generation, and offline processing gain mature algorithms and SIMD optimization.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
engine-programmingphysics
What to check
Template instantiation raises compile costs, and alignment and expression aliasing rules must be followed.