Jump to content
Sign in to follow this  
ErichR

Trace Bitmap or Scan to Cad

Recommended Posts

The experimenting I've done, and learned from searching these forums, is that VW's Trace Bitmap command, to put it mildly, leaves a lot to be desired.

Maybe there's something I'm missing, but I think not. Trace Bitmap must be something of an embarrassment to VW staff, since stellar performance is otherwise the norm for this great app.

Has anyone been able to make it work at all? If so, I would really like to know how.

Share this post


Link to post

i have tried quite a few times before, but have found it either not to wrk completely or to produce something which doesnt even look anything like it should

Share this post


Link to post

I don't think there has ever been any software that could to this. Adobe had a stand alone app out a few years ago that didn't have much better results.

Share this post


Link to post

Aloha,

Adobe use to have an app called Streamline but now it is integrated in Illustrator. I found Vector Magic (vectormagic.com) does a decent job in many cases.

Bitmap tracing It is very dependend on the quality of the scan and the complexity of the drawing.

Share this post


Link to post

Yes, it interprets "lines" as zig zags with a million points, etc, etc. Seems really under powered or insensitive. Part of the problem, I think, is that developer and user intent may not be the same in all cases - Find edges? Pick out centers of bands? Interpolate curves? What's a corner? What lines/bands/areas are important to the end product? . . .

Some better poly filters in VW would really help clean up the bitmap trace. The Simplify Poly plugin may still be available somewhere and may help some. I think it used to be at VectorDepot, but I could not find it just now. It creates a new poly within some specified distance of the existing. If that distance is big enough, a whole lot of points are ignored.

Describe more what you are trying to do.

One approach is to draw a hand trace of the image with a constant line weight pen or pencil (remember rapidograph pens and drafting mylar?) and scan that for the bitmap trace. With this process, you get to pick which objects are of interest. You can ignore reflections, smears or whatever. I know, some images are too big/complex. But it can be quicker than mouse trace with polys.

Otherwise, trace in VW with polys. Or call a vector scanning service specialized in turning paper drawings into CAD files. Their custom software may be able to vectorize images better than the VW Trace Bitmap.

-B

Share this post


Link to post
I don't think there has ever been any software that could to this.

Macromedia's Freehand had a FANTASTIC trace tool. but I'm not sure what became of it after Macromedia got swallowed. It might have been incorporated into Flash or Illustrator. (??)

The VW trace has always been awfull and only just barely works on very simple high contrast line work

Share this post


Link to post

Some better poly filters in VW would really help clean up the bitmap trace. The Simplify Poly plugin may still be available somewhere and may help some.

God Bless John Williams who wrote that thing(I think). I use it all the time.

I can't imagine why it has never been introduced into the program. I have a copy of the VSS or VSM file for 2011 if you cant find it at VectorDepot. (I think it's in the "old" section down near the bottom of the list.

Share this post


Link to post

Re: Bob-H and the Vectorscript.

I don't have any experience with scripts. I did name and save the script into Tools/Scripts/PlugIn Editor.

Then imported an image of a floor plan, selected it, and then went to Scripts/Run Script. A window opens for selecting the file. It's not to be found.

In the Resources Browser, there seem to be no scripts available.

It would help to know how to invoke the script, in what context, and what to expect. Thanks.

Share this post


Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

 

7150 Riverwood Drive, Columbia, Maryland 21046, USA   |   Contact Us:   410-290-5114

 

© 2018 Vectorworks, Inc. All Rights Reserved. Vectorworks, Inc. is part of the Nemetschek Group.

×
×
  • Create New...