GENERATING precise 2D outline.

Hi , can anyone help me .. how can i achieve a precise 2D out line of any image .

Any help would be greatly appreciated.
Thank you.

Replies to This Discussion

Permalink Reply by Jesus Galvez on April 19, 2013 at 11:14am

Illustrator's image tracing works best with black and white images. If you have a larger image you'll get more detail. But I got a good result from the image you posted.

Attached file is in dwg format.

Attachments:

Converted.zip, 736 KB

Permalink Reply by Shridhar Mamidalaa on April 19, 2013 at 11:19am

Thank u for the reply Jesus .. but what if image has more shades of grey ?? can some sort of culling pattern of imagesampler's points can be outlined..??? proxyity 2d maybe ??

Permalink Reply by Jesus Galvez on April 19, 2013 at 11:26am

What David said. Give it a try with Inkscape, it's free (and bloat-free).

Permalink Reply by David Rutten on April 19, 2013 at 11:21am

It' called Tracing. Several vector graphic programs (such as Illustrator or Xara) have this functionality build in. It is not however easy and results are often not very accurate either.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by David Rutten on April 19, 2013 at 11:33am

Incidentally, if you need it, why not buy it?

http://www.shutterstock.com/pic-37302133/stock-vector-seamless-blac...

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Shridhar Mamidalaa on April 19, 2013 at 11:38am

I didn't mean to be that image in particular Sir David . Are there any ways achieving it ghx alone ?

ok now precision is not a consideration :P .

Permalink Reply by David Rutten on April 19, 2013 at 12:45pm

Very difficult. You could get a very bad representation by importing the image and creating a mesh heightmap out of the greyscale values. Then you could slice that heighmap and get polylines. But for an image with as much detail as the one you posted you'd need a very high resolution which would slow down the process significantly.

In this example I use 1000 x 1000 samples and it takes about 15 seconds.

And when you zoom in you see that the detail is pretty wobbly.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Jesus Galvez on April 19, 2013 at 2:40pm

Permalink Reply by nass on September 26, 2013 at 7:57am

hallo david, is it possible to post the grasshopper file, i am not able to produce it ...

thx in advance!

Permalink Reply by Sergio Ormachea on October 23, 2013 at 11:07am

hello david, Im having trouble finding all the components, I don't use images for the components, is there any way you can post the words on the definitions.

Also on the Z vector you added an expression, what does this do?

Thank you so much. Im trying to trace some shadows.

Sergio

Permalink Reply by Shridhar Mamidalaa on April 19, 2013 at 7:17pm

Thank u Sir David and Jesus.

Permalink Reply by martyn hogg on October 23, 2013 at 1:35pm

Yeah David please post that definition... I tried something similar which, if I fiddle with the sliders, sometimes gives me points that I can draw lines through, but in most case just gets me frustrated waiting for the model to update and then gives me some points I can draw a line through and a load of points that I can't.

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