From FreeCAD Documentation
| Option
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Description
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| Default solver
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The solver that is used for solving the geometry. LevenbergMarquardt and DogLeg are trust region optimization algorithms. The BFGS solver uses the Broyden–Fletcher–Goldfarb–Shanno algorithm.
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| DogLeg Gauss step
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This setting is only available for the solver DogLeg. It is the step type used in the DogLeg algorithm.
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| Maximum iterations
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If the solver needs more iterations to find a convergence to a solution, it will stop and output that it failed.
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| Sketch size multiplier
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If checked, the maximum iterations will be multiplied by the number of parameters. The idea is that bigger sketches would need more iterations to converge.
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| Convergence
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The threshold for the squared error. This error is used to determine whether a solution converges or not.
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| Eps/Eps1/Tau
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These settings are only available for the solver LevenbergMarquardt. You should only change something here if you fully understand how the LevenbergMarquardt solver works.
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| Tolg/Tolx/Tolf
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These settings are only available for the solver DogLeg. You should only change something here if you fully understand how the DogLeg solver works.
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| QR Algorithm
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During diagnosing the rank of the matrix is calculated which enables to further analyze the constraint system to determine if there are redundant/conflicting constraints. The rank revealing decomposition used in FreeCAD is QR. There are two algorithms: Eigen Dense QR is a dense matrix QR with full pivoting, which is the legacy proven algorithm that works very well but it is rather slow as the system grows. The Eigen Sparse QR algorithm is an optimization for sparse matrices (having lots of zeros), which is usually much faster, since FreeCAD's systems do have a lot of zeros.
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| Pivot threshold
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When doing a QR, values under the pivot threshold are treated as zero.
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| Redundant Solver
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The solver that is used during diagnosing to determine whether a group is redundant or conflicting.
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| Red. Max Iterations
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The same as Maximum iterations, but for the redundant solving.
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| Red. Sketch size multiplier
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The same as Sketch size multiplier, but for the redundant solving.
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| Red. Convergence
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The same as Convergence, but for the redundant solving.
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| R.Eps/R.Eps1/R.Tau
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The same as Eps/Eps1/Tau, but for the redundant solving.
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| R.Tolg/R.Tolx/R.Tolf
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The same as Tolg/Tolx/Tolf, but for the redundant solving.
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| Console Debug mode
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Setting to specify the verbosity of the console output.
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| Solve
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This button explicitly starts the solver.
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| Restore Defaults
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This button restores the default solver settings.
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