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Undoing a part of a UNION

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Liam Nolan

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Feb 6, 1998, 3:00:00 AM2/6/98
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Hi,

Can anyone helpme?

I have made a union of a few extruded polylines, but need to undo a
small part of the Union without exploding all of the union (am I
making sense?).

I can do it by making an extruded rectangle and then covering the part
I want to edit and subtracting it from the part I want to keep. Only
problem is it obviously deletes the part I want to edit.

Is there a way that I am missing of selecting the part to edit and
only editing this part like streching it or something.

Hope I'm making sense.

Regards.

Liam Nolan
Bye

Liam Nolan

CC1964CAD

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Feb 6, 1998, 3:00:00 AM2/6/98
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Use the slice command. You can pick three points to represents the slicing
plane. And can keep both pieces.


Chris
cc19...@aol.com

Lorne Tontegode

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Feb 6, 1998, 3:00:00 AM2/6/98
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I suspect that you are working with R13 or 14. You can't undo only selected
parts of operations in ACIS solids in vanilla AutoCAD. You can do UNDOS and
go back to a point in the construction though.

These are some methods that I use to edit solids in R13.

-Copy the part and do different things to each and then union them back
together again.

-Wblock some of the geometry out to a temporary file and them undo to my
hearts content.

-Use Windows clipboard to hold onto geometry while I undo to a point before
geometry I need to keep was made.

-Stretch a part by making a copy of it and subtracting a large box from each
part. Place the box in different positions relative to each and do the
subtraction. Union the resultant two parts back together. This only works if
the part has no irregular geometry along the stretch plane.

-Break the part up into its constituent parts by copying it and doing
subtractions on different areas of each.

-Do all of your solids work with DELOBJ set to 0. This will leave the
original 2D geometry behind for you to reuse.

Hope some of this helps. You really have to use your imagination when
working with R13s native solids.

Lorne Tontegode

Liam Nolan wrote in message <34db03f3...@news.iol.ie>...

Liam Nolan

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Feb 7, 1998, 3:00:00 AM2/7/98
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On 6 Feb 1998 22:20:26 GMT, cc19...@aol.com (CC1964CAD) wrote:


Thanks this seems reasonable. I did play with the slice command but
when I did it it sliced every thing along the xy axsis. I'll try the
3point part of the command.

Thanks again.

Bye

Liam Nolan

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