I have an object which I have created using three boolean diff operations. I want to top-align it to a surface, but it always behaves as if the top of the object is at a distance from itself. In other words, when I top-align this object, it doesn't actually align.

Is there some invisible clipping going on that the top-align function is not taking in to account?




The object is labelled by the blue arrow, while the edge I am trying to top-align it to is labelled by the red arrow. I use the "Front" view to top-align, but I'm showing the 3D view since it's easier to see what I'm trying to accomplish there.

Hi Duane, can you please post your 3DM model file or e-mail it to me at moi@moi3d.com if you want to keep it private so I can take a look?

re: Top view - the Transform > Align command does align things in a 2D sense relative to the construction plane so you would need to do it in an elevation view like the Front view. But it sounds like that's what you were doing.

It could be some kind of bug in the calculation of the object's bounding box, there is a certain kind of clipped out area to many objects, which is that when you do a boolean or trim a surface, there are new trim curve boundaries created but the original "underlying surface" is still there underneath those trims. If something goes wrong with the calculation process it could be possible that stuff is leaking out to a further extent than the current trim boundaries but that would be a bug and not something that you'd normally have to worry about.

I could tell a lot more if you could send the 3DM model file.

- Michael

Thanks Michael. I can't seem to replicate the problem right now, so I'm not sure if there's any sense in sending the file. I continued with my work and then came back to discover it would top-align just perfectly. If I see the problem again I'll send you a sample.