It seems that if you try to offset a spline that is sloped (i.e. not equal z coords) the offset amount is being multiplied by the cos angle of the spline.
Make a spline that goes from to . This is at a 45 degree angle (cos 45 =.707)
Now copy that spline and take the higher vertex back down to . Now offset both of those two splines by an amount of 1.0. The flat spline offsets properly at 1.0 but the sloped spline offset is reduced by the cos of the slope angle.
Not sure why is should opertate this way, but there may be some good logic.
Maxscript users be sure to add back in the reduction in offset due to slope if you are trying to creating things like Roof Soffits/Facia, and the like.
CT
