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3D surface plots - non deletion of data inside undesirable Range

a=2;b=1;c=3;gl={a Cos[ph-th],b Sin[ph-th],c Sin[ph+th]}/Cos[ph+th];

Extended plot limits in GL2 beyond those of GL1 result in 3D plot that
fail to delete undesired spurious tracing/tracking data between points
not lying on the required surface.Like 'pen up' data in earlier
graphing s/w. It is OK may be to plot an enclosed solid, but not for a
surface. The difficulty also appeared in earlier Mathematica versions.
Is there then, no work around possible?

Best Regards

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