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Sign convention for measurements between mate connectors
I'm trying to understand the sign convention on X, Y, Z distance measurements in Onshape. I have two mate connectors in an assembly and I'm measuring the X, Y, Z distance between the two mate connectors. Nether mate connector's axes are aligned with the world coordinates and also not aligned with one another. Depending on the sequence of selection I get different signs (+ or -) on the measure dialog. I can't seem to find any rules in the documentation related to the assumptions of directionality and signs when selecting two different mate connectors for measurement. I'm trying to use process of elimination but it's quite confusing given several of the dimensions are quite small and it's difficult to see the offsets in the geometry window when hovering.
Any help would be appreciated.