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SErf ...

SErf { TOL | TOLP } X

Sets tolerance for reusing surfaces constructed from bodies to X. If the coefficients of an existing surface are within X of a surface bounding a solid body, the existing surface is used in the decomposition of the body.

TOLP is separate tolerance for planes; TOL will be used for planes if TOLP is not defined.

Defaults: TOLP = 10^-4, TOL = 10^-6.

SErf TAlk { OFF | ON | ALL }

Reports on Re-use of existing surfaces when expanding body descriptions.

OFF	(default) No reports are given.
ON	Warns when surfaces of the a body would have been combined had they not been part of the same body. WARNING: Probably means TOL should be smaller.
ALL	A message is written whenever a surface is reused.

SErf

The current tolerances and talk level are reported. Talk levels 0, 1, and 2 correspond to OFF, ON, and ALL,