@timahrens @letterror The interpolations should remain identical at the scaled intervals along that axis, but changing the axis scale is also adding or removing intervals, and that unavoidably affects the addressable design space between the axes. That’s already the case in OTvar compatible design spaces, so is the problem significantly different in the kind of non-orthogonal design space Erik is illustrating? Or are you pointng to this as a general problem of multi-axis design spaces?