Sky-earth NMM will usually occur in objects that have a horizontal bend. For example, his breastplate and greaves.
Other objects, like the blade the halberd, would not show the horizon except in specific conditions.
The end of the halberd, which is a diagonal cylinder, is more difficult, and I cannot advis you on that.
Also, no matter how the object is moved, the horizon is always horizontal, although it may bend depending on how it is curved.
hope that helps
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