Rhino.Geometry.Transform.Translation does not move all mesh vertices by the same amount

@thomas.k wrote:

Hello

We are working with Rhino Version 6 (6.3.18090.471, 31.03.2018) on Windows 10 x64.

After processing the buildings near the coordinate system origin in order to avoid problems with the floating-point resolution, we have to move them back to the original location in our national spatial reference system.

For that move we use a translation:

xform = Rhino.Geometry.Transform.Translation(2621232.0,1259640.0,343.0)
rhino_object.Geometry.Transform(xform)

This screenshot shows the mesh near the coordinate system origin ( X=0, Y=0, Z=0)

After executing the transformation, one vertex near the ridge of the roof jumped to another mesh edge. On the screenshot ther is an offset visible.

AfterTransform.jpg928x639 62.3 KB

The behavior can be reproduced with the attached python script and the Rhino model.
TranslationMovesVertex.3dm (83.9 KB)

MoveGeometry.py (1.3 KB)

Any idea what goes wrong here?

Thanks in advance
Thomas

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