3D and Z - Dimensions & Modified 3d Solids

[akaterr55]

Here's the most difficult challenge ever!  Well, it would be to me if I tried to figure out how to do it...

After dimensioning a solid in 3d, when the solid is modified:

Dimensions move along and behave as expected except when the change involves the Z Direction (in relation to the dimension objects).  In that case, the dimension's anchor points DO move, but the rest of the dimension object's components remain in the Z location where it was created.

Please see attached drawing.  There are several copies of the source object with various mods to the solid to show the effect.  You also get the same effect by simply moving the solid object.  Select a dimension that looks out of place and you will see the anchor points have moved with the object, but the all the other components got left in their original position.  

Since the dimension objects' components obviously don't follow the Z of the anchor points, is it possible to reset them to match the Z of the anchor points (or at least anchor #1) with Lisp?  For all I know, it might involve some automated remake of the dimension?  Asking the experts here!

Thanks,

Mark

[hak_vz]

When you create your dimensions always align ucs with the face on which you are creating dimension. If you create dimension in other UCS change in Z direction doesn't happen.  So run command UCS, select option F for Face and align x axis along the face. Depending on direction of extrusion i.e how face is created flip ucs along x axis and accept when UCS is directed correctly. Either all point to upward Z or all to downward Z. That way changes in any direction will also move dimension object. Do not move dimensions.

[akaterr55]

Yeah I thought maybe setting UCS to face might anchor the entire dimension object. For me at least, its no different than manually setting the UCS. Would you mind posting an example of what is working? If you would, please post with the original and a copy of the objects with the solid modified in the dim's relative Z direction. I am very interested to see this work!