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Ian Bassi
ea10c84d6b
* Fix decomposition of mirrored transformations computeRotationScaling() may place the mirror on any axis, giving unstable rotation/scale for mirrored matrices. Decompose them by flipping each local axis and choosing the one needing the least rotation (lowest axis on ties). Merge the extract helpers into a single extract_rotation_scale() and simplify contains_skew() to check that the scale is diagonal. set_scaling_factor() now preserves the mirror sign on the scaled axis. Selection::scale_and_translate() uses Transformation's rotation and scale instead of calling computeRotationScaling() directly, so scaling a mirrored instance adds no skew. Add tests for mirrored decomposition, scaling, and skew detection. * Use Eigen polar decomposition for instance scaling Selection::scale_and_translate now splits the instance matrix with computeRotationScaling instead of get_rotation_matrix(). Adds a Model test checking that an instance created from another's offset, scale, rotation and mirror reproduces its matrix (as Add instance and Fill bed do). * tidy
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: