How to determine the drawing order using OdVectorizer? When Dumper in vectorizer prints out the data how do we know which should be drawn on bottom and which on top?

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Drawing order is used in .dwg only for 2dWireframe visual style. SortEnts Table is used during block drawing and user gets geometry in OdVectorizeEx in this order.

All other modes (styles) are considered 3D, so the geometry will be vectorized in the order in which it is in the block, SortEnts will not be applied. In 3D the drawing order is not important, because the depth buffer is used, the geometry is drawn in 3D space.