AutoCAD 2010/2011/2012

AutoCAD 2010/2011/2012

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Active Member
frederico.fonseca
Posts: 6
Registered: ‎02-14-2011
Message 1 of 10 (428 Views)
Accepted Solution

Same block has different appearances

428 Views, 9 Replies
11-20-2012 11:15 AM

How is it possible that the same block has different appearances?

Please check the attached drawing. The blocks are symmetrical, I can't understand why...

Hi,

 

>> It was mirrored, yes it was.

In this case: no, it's not mirrored, you can see that within the property window while the block is selected. If it was mirrored it would have got a scalefactor = -1 like this:

 

 

In that case here one block is inserted with another UCS or it was rotated (3D-rotated around the X-axis).

 

- alfred -

Mentor
Janet2009
Posts: 240
Registered: ‎06-04-2009
Message 2 of 10 (421 Views)

Re: Same block has different appearances

11-20-2012 11:28 AM in reply to: frederico.fonseca

Why can't it be mirrored? it can be larger if you wanted to even with same name.

Active Member
frederico.fonseca
Posts: 6
Registered: ‎02-14-2011
Message 3 of 10 (416 Views)

Re: Same block has different appearances

11-20-2012 11:36 AM in reply to: Janet2009
Hi Janet, It isn't mirrored, because scales and rotation are coincident (please check it yourself in the attached file). Purge, audit, recover... Nothing repaired it. How can I be sure I'm safe from it to happen without me to notice?! I'm sorry I didn't understand what you meant to say with "it can be larger if you wanted to even with same name." What do you mean? Thanks
*Expert Elite*
Alfred.NESWADBA
Posts: 9,100
Registered: ‎06-29-2007
Message 4 of 10 (412 Views)

Re: Same block has different appearances

11-20-2012 11:37 AM in reply to: frederico.fonseca

Hi,

 

one block was inserted sitting on top of the WCS (world coordinate system), the other block was inserted from a UCS with negative world-Z (one block was drawn looking normal onto the table, the other was drawn looking from floor to the table-surface).

 

- alfred -

-------------------------------------------------------------------------
Alfred NESWADBA
Ingenieur Studio HOLLAUS ... www.hollaus.at
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Mentor
Janet2009
Posts: 240
Registered: ‎06-04-2009
Message 5 of 10 (405 Views)

Re: Same block has different appearances

11-20-2012 11:41 AM in reply to: frederico.fonseca

It was mirrored, yes it was.

A block scale up or down, rotate, mirror still has same name.

*Expert Elite*
Alfred.NESWADBA
Posts: 9,100
Registered: ‎06-29-2007
Message 6 of 10 (401 Views)

Re: Same block has different appearances

11-20-2012 11:47 AM in reply to: Janet2009

Hi,

 

>> It was mirrored, yes it was.

In this case: no, it's not mirrored, you can see that within the property window while the block is selected. If it was mirrored it would have got a scalefactor = -1 like this:

 

 

In that case here one block is inserted with another UCS or it was rotated (3D-rotated around the X-axis).

 

- alfred -

-------------------------------------------------------------------------
Alfred NESWADBA
Ingenieur Studio HOLLAUS ... www.hollaus.at
-------------------------------------------------------------------------
**Master
dmfrazier
Posts: 2,750
Registered: ‎05-13-2003
Message 7 of 10 (389 Views)

Re: Same block has different appearances

11-20-2012 12:57 PM in reply to: Alfred.NESWADBA

Good catch, Alfred.

This can be seen using the LIST command.  The "backwards" one indicates:

   Extrusion direction relative to UCS:
                  X=   0.0000  Y=   0.0000  Z=  -1.0000

Active Member
frederico.fonseca
Posts: 6
Registered: ‎02-14-2011
Message 8 of 10 (368 Views)

Re: Same block has different appearances

11-21-2012 02:47 AM in reply to: frederico.fonseca

Dear Masters and Mentors,

 

Yes, in fact I could replicate this unusual situation by inserting one of the blocks using the Bottom view with the UCS aligned with the view.

Thank you for sharing your knowledge.

 

I doubt that someone has used an inverted view or a non-World UCS, because here we draw exclusively 2D with uniform UCS (drawings are shared and we need to preserve the UCS). These blocks were nested in other bigger blocks (I got them from exploding the main blocks). Would it be possible that some symmetry in the main blocks would have caused this? I mean, is there any other way to do this in another way rather than changing the view or the UCS?

*Expert Elite*
Alfred.NESWADBA
Posts: 9,100
Registered: ‎06-29-2007
Message 9 of 10 (362 Views)

Re: Same block has different appearances

11-21-2012 03:55 AM in reply to: frederico.fonseca

Hi,

 

>> another way rather than changing the view or the UCS?

3DROTATE or setting the UCS to any side-view and then use (normal) ROTATE.

One special command that also would result in that situation is _ALIGN. (for better resolution I have also attached an SWF-anim-file)

 

Acad_AlignTo3DRotateBlockRefs_2013_AN01.gif

 

But if you (your employees) only work 2D my first guess would by there was someone playing with viewcube or with views.

 

- alfred -

-------------------------------------------------------------------------
Alfred NESWADBA
Ingenieur Studio HOLLAUS ... www.hollaus.at
-------------------------------------------------------------------------
Active Member
frederico.fonseca
Posts: 6
Registered: ‎02-14-2011
Message 10 of 10 (261 Views)

Re: Same block has different appearances

12-11-2012 12:14 PM in reply to: Alfred.NESWADBA

Dear Alfred,

 

Thank you for the didactic and question-proof answer!

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