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Action:
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Sets the following system tolerances:
SPAresabs,
SPAresnor,
SPAresfit, and
SPAresmch.
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Filename:
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kern/kern_scm/tol_scm.cxx
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Syntax:
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(env:set-tolerance resabs=1e-6 resnor=1e-10
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resfit=1e-3 resmch=1e-11)
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Arg Types:
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resabs
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real | boolean
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resnor
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real | boolean
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resfit
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real | boolean
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resmch
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real | boolean
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Returns:
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(integer ...) . (real ...)
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Description:
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The system tolerances are set in the following order:
SPAresabs,
SPAresnor,
SPAresfit, and
SPAresmch.
SPAresabs to
SPAresnor gives the largest numbers that can be represented. The previous values of each variable are returned in a list.
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SPAresabs determines if two positions in space are equal. This tolerance defines the smallest distance between two distinct points.
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SPAresnor checks a number for equality with 0. This checks components of numbers that are 0 for determining if vectors are parallel or perpendicular, or for checking for zero lengths.
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SPAresfit fits interpolation curves when intersecting surfaces.
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SPAresmch is used by the spline package for purposes similar to the use of
SPAresnor in the system.
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For each element argument, a
real sets the value, a
boolean#f leaves it unchanged, and
boolean#t sets it to the default value.
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Note
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Changing these values can have a significant effect on modeling functionality and should only be undertaken when absolutely necessary!
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Example:
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; env:set-tolerance
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; Change the resabs and resfit tolerances, leave
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; resnor unchanged, and set resmch to the default.
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; Get the list of system tolerances.
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(env:tolerance)
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;; (1e-06 1e-10 0.001 1e-11)
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(env:set-tolerance 1e-3 #f 0.1 #t)
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;; (0.001 1e-10 0.1 1e-11)
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; Get the list of system tolerances.
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(env:tolerance)
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;; (0.001 1e-10 0.1 1e-11)
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; Reset the tolerances.
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(env:set-tolerance 1e-06 1e-10 0.001 1e-11)
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;; (1e-06 1e-10 0.001 1e-11)
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