I've got two roof faces which meet each other at a vertical join. If I look at them in 3d, I can see that the 'inner' faces are aligned at the join, but the 'outer' faces aren't. This is because the two roof faces are at different pitches.   (Am I correct to understand that the reason they are aligned on the inner face is because this is where I have set the "datum" for the components on each?)   But when I look at this in top-plan view, they are drawn as if they are ov