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Anonymous
2136 Vistas, 6 Respuestas

Polylines are drawn out of plane

Hi I'm wondering if someone can help me straighten out my truss drawing. When you see it from the ucs x-y plane, the drawing seems fine and in line (first attachment). But when I start looking at the drawing from another angle, it now looks really wacky (second attachment). I'm pretty sure I drew the truss in the same plane (x-y). I'm just not sure why it looks like that.  

pendean
en respuesta a: Anonymous

Post your actual DWG file please.

Anonymous
en respuesta a: pendean

Ah that would help. The truss I was referring to is the one on the far right. 

imadHabash
en respuesta a: Anonymous

Hi,

your problem caused by your drawing UCS  !!!! 

The user coordinate system (UCS) establishes the location and orientation of a movable Cartesian coordinate system. The UCS is an essential tool for many precision operations. The UCS defines :

  • The horizontal and vertical directions used for features like Ortho mode, polar tracking, and object snap tracking
  • The alignment and angle of the grid, hatch patterns, text, and dimension objects
  • The origin and orientation for coordinate entry and absolute reference angles

SO .. if you type UCS command >>W ( world ) THEN type PLAN command and double enter. NOW go to your drawing to discover that you have a bad drawing ... isn't it ? you have a polylines elevation with Z values .

Command: UCS
Current ucs name: *NO NAME*
Specify origin of UCS or [Face/NAmed/OBject/Previous/View/World/X/Y/Z/ZAxis] <World>: w
Command: PLAN

Enter an option [Current ucs/Ucs/World] <Current>:

 

i suggest to fix your issue is make your UCS ( World ) as mentioned above then type FLATTEN Express Tools command to kill Z values for all of your selected items (  to change the Z values of all lines, arcs, and polylines to 0.  ) >> Click << . BUT you still have unclosed truss . so now you have to redraw your lines again.

 

 

Imad Habash

EESignature

leeminardi
en respuesta a: Anonymous

Note that when you create a polyline its first vertex will have the xyz coordinates of the point you specify but subsequent vertices will be project to a plane parallel to the current UCS. The location of that plane is determined by the first vertex.  For example, let's say you have some geometry that does not lie on the current UCS and you start to create a polyline using OSNAP END. The first vertex will snap exactly to the vertex of the end of line you pick but the next point you pick will be project to a plane parallel to the ucs that passes through the first vertex. In your example if the rafters lie on a plane but a different UCS is active when you create the cross members of the truss, the trus members will lie on a different plane.

lee.minardi
Anonymous
en respuesta a: imadHabash

Ah I tried the PLAN command and I see the defects in my drawing now! Thank you. So just to clarify, should I redraw lines after doing the UCS world command?

Anonymous
en respuesta a: leeminardi

Thank you for replying! So do you mean that the next vertex will go to a plane parallel to the UCS X-Y PLANE?