odd difference between paper and model

Yuval W

I have a design which shows a certain model. When I switch to paper space it shows me the design where a few elements (blocks, text, lines) are places somwhat off their original location. Why is that ?  This occures in several designs.

(I wanted to post pictures to demonstrate but I don't see attach capability)

Anthony Apostolaros

You can post an image elsewhere (on ImageHost, for example) and then include a link to it in your post, by selecting some text and clicking the Insert/Edit Link icon.

Like this.

Yuval W

good idea.

Here are two pictures from the same design, why is there a difference?

in the paper space you can see the desired picture : http://i.imagehost.org/0742/this.jpg [url=http://i.imagehost.org/view/0742/this][img]http://i.imagehost.org/t/0742/this.jpg[/img][/url]

but in the model space the picture is quite different : http://i.imagehost.org/0821/that.jpg [url=http://i.imagehost.org/view/0821/that][img]http://i.imagehost.org/0821/that.jpg[/img][/url]

 

Yaacov Lazar

I notice a slight jig in the X axis of the UCS icon in the modelspace view.

This hints to me that you may have a situation where the current plan view is not entirely parallel to the WCS, including by the Z-axis.

That is, you're looking at the drawing at a slight angle from the vertical, it could be said.

(This actually happened to me once, half of everything I drew was at a slight angle to the X-Y plain. It was horrible to fix.)

If some of your lines (and a block, I see) also have large Z coordinates at some of the endpoints, they'll look completely normal in a WCS plan view,

but weirdly skewed if your plan view is at a slight angle to the X-Y plain.

This can happen if you inherit some parts of your drawing from a surveyor, who habitually draw everything in 3D, not only topography contour lines.

 

To diagnose and fix the problem, first run DDVPOINT in modelspace and in the horizontal window of the dialog box pick the end of the X axis.

(I know electrical engineers don't do much in 3D, so I'll explain in detail)

This will give you a view of your drawing "edge-on" looking down the X axis.

Your drawing should look like a horizontal multi-colored thin line across the screen.

If you see anything running off up or down, or anything above or below that line, or if you see nothing but a couple of tiny dots or a vertical line,

then you have some entities with non-zero Z coordinates.

Undo the DDVPOINT command and then run FLATTEN on your drawing, and cross your fingers. (You should read the Bricscad help on Flatten, first).

You should also inform the Architect you got your base drawing from.

I hope this helps!

 

 

Yaacov Lazar

Oh, and your other problem would be a skewed view.

Just run "PLAN" and press enter twice - in each viewport.

Yuval W

I don't know how you came up with the z-axis gone bad idea - but you nailed it, that is the problem. 

Thanks for a well-put tutorial, teached me some important points.  now if you excuse me I have to fix the floor. and the other floors. 

 

Yaacov Lazar

You're welcome!

Hah! thanks for giving my ego a boost

 

Other symptoms are a lot failed intersection or perpendicular esnaps or odd difficulties in joining plines.

When it happened to me, I had already copied the original file to several (different) alternatives.

The worst was handling the arcs. When they are "mapped" down  to the proper XY plane they either became elliptical arcs or fly off the screen.

(I tried to solve it with some lisp - dxf code 210 IIRC) I finally had to redraw each arc individually

Of course that's only if you had actually DRAWN stuff in the skewed-to-XY-plane (shudder) I hope not.

 

Where do you work?  I'm in Haifa.

Yuval W

 

I work in Tel-Aviv. Just finished my BSc in electrical engineering and started planning residential buildings in an office.  I gather you are an architect ?

Yaacov Lazar

Yup.

I began  working sometime around the end of the Jurrassic (i.e. rapidograph and T-square),

and started CAD with AutoCAD R11.

Compiled my own Hebrew fonts, (wrote a font converter in lisp).

I have about 1.5 mb worth of lisps I use.

I hate toolbars and icons.   I read xkcd, Dilbert and Userfriendly.org.

And, yes, I have a ponytail  (now running to grey).

 

Yuval W

Dilbert taught me two things that I hope will come handy sometime: first of, contrary to the spread belief, YOU don't get a promotion, but your clothes do, so be sure to buy smart outfits and make sure you stay in them when they get promoted. The second is about dating, which is "beging phony long enough until the other person loves you for who you are".

xkcd's weet.  I'd add penny arcade to the list