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Created with Raphaël 2.2.08Feb7626Jan14121154120Dec1965325Nov2019161514124328Oct272625242321201918171614131211430Sep252222Aug191115Jul131124Jun141312109763130May292317125Apr2221181110865432131Mar2928172Feb31Jan302826242322211917141310implement the remaining curvature and bending terms for the energy gradient. These are not working yet, though.Add a method to get the second derivatives of the directorsuse the relative error when looking for differences between analytical and fd expressionsStart implementing the analytical gradient of the energy functional.factor out grid creation into a separate methodadd a method that compares the energy gradient to its fd approximationfix memory leakfix two places where 2d-grids where hardwiredfix copy'n'paste documentation bugname argument should be the filename, not some prefixThe Cosserat energy now needs the shear correction factor 'kappa'ignore executable globalgfetestfunctionbasistestimplement fd approximation properly using the exponential mapwrite in VTK format instead of AmiraMeshStupid me: add missing return statementReimplement mixed third derivative methodabort again on errorsReimplement method thirdDerivativeOfDistanceSquaredWRTSecondArgumentReimplement method secondDerivativeOfDistanceSquaredWRTFirstAndSecondArgumentdon't keep a private implementation of derivativeOfArcCosSquared -- use the one from UnitVector insteadReimplement method secondDerivativeOfDistanceSquaredWRTSecondArgumentMake Rotation<T,3> friend, it needs the derivatives of the arcus cosinereplace an 'I'm not really sure'-style comment by a proper explanationReimplement method derivativeOfDistanceSquaredWRTSecondArgument.make the 'distance' method simpler and fasterHack a few explicit constructor calls in there that were implicit before.remove some unnecessarily complex codewe know the function value when calling evaluateDerivative. So let's give that value to the method, to prevent it from recomputing itAdd a second method evaluateDerivative which accepts the function value as input.Write a Cosserat continuum into a vtk file.Rewrite the code a bit to avoid some unnecessary copying.initialize after and slightly correct documentationfix some (but not all) compiler errorsbugfix: method size() must return size_tfix template argument order of the TargetSpace classesmake compile: use the Rotation class where rotations are meantFix type errors: tangent vectors to SO(3) are NOT RotationsExplicitly request Quaternion multiplication instead of Rotation multiplication.The Dexp method wants a SkewMatrix instead of a vector nowmake static interpolation methods public, so the unit tests an access them