How do you align an UCS to isometrical plane.

[mike.young]

Wonder if any one can help.
How do you align your UCS to isometrical plane. I can isometric snap and F5 Isoplane but can not figure aligning the UCS. I do not mean orthographic ie ucs x 90 ect but 45 degree alignment.
Basically i have had the problem below and am trying to figure how the situation developed.

........
jfon0604


ok...total noob question here. I have an existing drawing. The UCS icon is rotated as well as my cursor. With ortho on while trying to draw a box, its not vertical and horizontal like it normally is, its drawn at the ucs rotation. I have checked the snapang and its already set to 0, so now I am confused. I've set the ucs to world and still nothing. Can someone help me out? Thanks.

J--------------------------------------------------------------------------------
rkmcswain
Super Member

Set UCS to World
Run the PLAN command, press <enter> twice
Set SNAPANG to 0.0

[bmonk]

You can align the UCS pretty easily by using the UCS command, and then entering _3 as an option. Then you can select 3 points on an isometric drawing to rotate your UCS.

Also UCSFOLLOW might be whats keeping you from seeing changes made to the UCS.

Make sure its set to 1.

Hope that helps

[Railrose]

I've done some basic isometrics by going to the object snap dialog box. Click on the "snap & grid" tab & go to the lower left section of the box. It will give you the option to turn iso snaps on & off.

[jaberwok]

Ignore the "isometric" part of the problem - they are not related.

[bmonk]

Do you know the answer Jaber? I must not be following the question then.

[scott.wilcox]

You can align the UCS pretty easily by using the UCS command, and then entering _3 as an option. Then you can select 3 points on an isometric drawing to rotate your UCS.

Also UCSFOLLOW might be whats keeping you from seeing changes made to the UCS.

Make sure its set to 1.

Hope that helps
You can also type "o" at the ucs prompt to select an object , which represents the positive x-axis of your new ucs.

[jaberwok]

Do you know the answer Jaber? I must not be following the question then.

I'm not entirely sure of the question but I know that "isometric" is just confusing the issue.

In case anyone cares -
You can't set UCS to an isoplane because an isoplane doesn't actually exist. UCS axes are always at 90%%d to each other - isometric pretends that axes are at 120%%d.

~shrug~

[mike.young]

Thanks for all your replys and help. My inital post was a little confusing.
Basically please find attached Dwg. I am wondering how this ucs w orientation came about.

Thanks in advance

[Richard McDonald]

I'm a bit confused? not hard I know.

CADs world UCS is aligned with the north arrow whilst the drawing is rotated to bring the building horizontal.

There seems to be no Isometric data?

If your after getting your cross hairs aligned with the building create a new UCS. If you need to bring it back to world co-ordinates use the ucsfollow command.

Richard

[mmccarter]

I might have mis-understood the request, but is it not simply a case of typing "PLAN" and hitting return twice? :)

[zoomharis]

Wonder if any one can help.
How do you align your UCS to isometrical plane. I can isometric snap and F5 Isoplane but can not figure aligning the UCS. I do not mean orthographic ie ucs x 90 ect but 45 degree alignment.
Basically i have had the problem below and am trying to figure how the situation developed.

........
jfon0604


ok...total noob question here. I have an existing drawing. The UCS icon is rotated as well as my cursor. With ortho on while trying to draw a box, its not vertical and horizontal like it normally is, its drawn at the ucs rotation. I have checked the snapang and its already set to 0, so now I am confused. I've set the ucs to world and still nothing. Can someone help me out? Thanks.

J--------------------------------------------------------------------------------
rkmcswain
Super Member

Set UCS to World
Run the PLAN command, press <enter> twice
Set SNAPANG to 0.0
Hi Mike,
Actually your UCS has been rotated along the Z axis for an angle of 16.9600546° along the Z axis. Go to Tools --> New Ucs --> Z and give the above value to get your normal ucs back. Or if you use UCS command, follow this


Command: ucs
Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World]
<World>: Z
Specify rotation angle about Z axis <90.0000>: 16.9600546

I hope that solves your problem.

[mike.young]

Thanks mmccarter & Zoomharris i can get back the UCS to normal alighnment with plan & new z coords from UCS. Plan gives me alighned ucs but rotated drawing and new ucs reverts to original odd alighnment at command ucs W.Do you know how the ucs world setting for this drawing has happened.

Thanks in advance

[scott.wilcox]

Thanks mmccarter & Zoomharris i can get back the UCS to normal alighnment with plan & new z coords from UCS. Plan gives me alighned ucs but rotated drawing and new ucs reverts to original odd alighnment at command ucs W.Do you know how the ucs world setting for this drawing has happened.

Thanks in advance
DVIEW --> TWist will give you this result quite easily.

From the file you posted, if you want to align your crosshairs with your view, type UCS (enter) V (enter). This will set your current UCS to the View, and your crosshairs will adjust accordingly. Please note the coordinates are now different, so switch back to World UCS if you need that info.

[mmccarter]

It looks to me as if there is a "reference" line above the main data of the drawing which the ucs has been set to and then the PLAN command used.

I use this method alot when working with laser scanned point cloud information to plot elevations of buildings in 3D by creating a reference plane, setting my ucs to it and flipping the ucs around x by 90 degrees.

The plan command can be a very useful one in many situations imo.

[mike.young]

Scott Wilson
Thanks Scott Dview - twist was the solution i was after. Dont know why they set up the drawing like that in the first place.
Thanks again
Mike Young

[Richard McDonald]

Mike,

An easier way on this drawing IMHO would be.

Command: ucsfollow
Enter new value for UCSFOLLOW <0>: 1

From the UCSII toolbar pick any of the preset "ucs's" say top.
then Pick "world" ucs again and the drawing will be as you want.


note:
Ucsfollow will not change anything as far as I'm aware until a new ucs has been picked.
Changing ucsfollow off as soon as finished with stops all the problems that can happen with vports and the align command.

Richard

[scott.wilcox]

Mike,

An easier way on this drawing IMHO would be.

Command: ucsfollow
Enter new value for UCSFOLLOW <0>: 1

From the UCSII toolbar pick any of the preset "ucs's" say top.
then Pick "world" ucs again and the drawing will be as you want.


note:
Ucsfollow will not change anything as far as I'm aware until a new ucs has been picked.
Changing ucsfollow off as soon as finished with stops all the problems that can happen with vports and the align command.

Richard


Richard, I'm not entirely sure your suggested method would be successful in this case, since preset 3D UCS views are not the issue here; it is a custon twist of the UCS z-axis only.

Also, could you elaborate on problems that can happen with vports and the align command? I don't quite follow your comment. (Sorry, my LOGICFOLLOW is set to 0 today )

[Richard McDonald]

Richard, I'm not entirely sure your suggested method would be successful in this case, since preset 3D UCS views are not the issue here; it is a custon twist of the UCS z-axis only.

Also, could you elaborate on problems that can happen with vports and the align command? I don't quite follow your comment. (Sorry, my LOGICFOLLOW is set to 0 today )
Scott,

I have followed through on the sample drawing and it works o.k.

A basic analogy to what is going on is rotating a piece of film around on a drawing board.

Whether using dview twist or ucsfollow 1 => world the result is the same just I personally keep away from dview twist in favor of creating a new ucs. Its just with a named ucs I can come back exactly to that rotation at any time with a simple click.

Ucsfollow set to 1 whilst creating viewports will force them to zoom extents every time they are opened (tilemode = 0 / model space) There have been many a question on the forums about this and has probably caused significant hair loss in the cad populace. Whilst aligning objects whilst set to 1 it used to do all sorts of weird zooming and rotating when at any other ucs but world. i can't seem to recreate this at present.


Regards

Richard

[scott.wilcox]

Scott,

I have followed through on the sample drawing and it works o.k.

A basic analogy to what is going on is rotating a piece of film around on a drawing board.

Whether using dview twist or ucsfollow 1 => world the result is the same just I personally keep away from dview twist in favor of creating a new ucs. Its just with a named ucs I can come back exactly to that rotation at any time with a simple click.

Ucsfollow set to 1 whilst creating viewports will force them to zoom extents every time they are opened (tilemode = 0 / model space) There have been many a question on the forums about this and has probably caused significant hair loss in the cad populace. Whilst aligning objects whilst set to 1 it used to do all sorts of weird zooming and rotating when at any other ucs but world. i can't seem to recreate this at present.


Regards

Richard
Actually, DVIEW Twist and UCSFOLLOW are completely different from the standpoint that Dview only changes your view of the drawing, while UCSFOLLOW creates a new UCS with a new current origin. I personally endorse UCSFOLLOW to be 0, see here (http://forums.augi.com/showthread.php?t=24255), here (http://forums.augi.com/showthread.php?t=8673) and here (http://forums.augi.com/showthread.php?t=8942).

Your analogy of rotating the film on the drawing board is UCSFOLLOW, but the position of the film is changed. DVIEW is the analogy of standing somewhere else and looking at the unmoved film from a different location.

Regards,
Scott