Fixed TwistedTube when only half-length is provided #1243
Merged
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It turns out that
GetNegativeEndZ
may be <0, leading to undefined behavior when the value is used as 'half-length'Replacing
GetNegativeEndZ
byGetPositiveEndZ
in the Geant4 converting function fixes the problem becauseGetPositiveEndZ
corresponds to the user value (that is expected to be the half-length of the twisted tube, as the half-length parameter of a regular tube)The change is tested in my local installation of DD4hep.
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