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Coin in 3D from a texture [message #43433] Sat, 04 February 2012 04:15 UTC Go to next message
avatar e.cachucho  is currently offline e.cachucho
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Im looking for someone that could take an of the front and the back of a coin and create a shapeways ready 3d file for me.

I basically want the detail in the images of the coin to show up as corresponding ridges in the coin.

index.php?t=getfile&id=14253&private=0
[image used as example]
have actual image at higher resolution for a going measuring 19mm.

Regards
Eduardo

Re: Coin in 3D from a texture [message #43435 is a reply to message #43433 ] Sat, 04 February 2012 06:13 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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I would suggest trying a program such as 123dCatch (www.123dcatch.com).

For any of such programs to work, you need high-resolution pictures from a couple of different (close) angles such as a stereoscopic pair of photos.


Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: Coin in 3D from a texture [message #43475 is a reply to message #43435 ] Sun, 05 February 2012 08:00 UTC Go to previous messageGo to next message
avatar Jackablade  is currently offline Jackablade
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That's a tricky one.
I've used 123DCatch for capturing maquettes at work. Maybe it'd work with a lot of messing about, but I don't think it or any similar image based model generation softwares would really be anywhere near sensitive enough to capture the fine detail on a coin and turn it into geometry. Your best best would be trying to get a very neutrally lit shot of each side of it and try to convert it into a height map.

Is a Shapeways print going to be high enough resolution to show off those details?

[Updated on: Sun, 05 February 2012 08:01 UTC]

Re: Coin in 3D from a texture [message #43479 is a reply to message #43433 ] Sun, 05 February 2012 11:24 UTC Go to previous messageGo to next message
avatar benoit  is currently offline benoit
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Alternatively, you could (in the worst case manually) trace the detail to vectors, and build the 3D model from the outlines. I think it's certainly doable, it might just be some work, there seems to be a lot of detail!

To print in a regular coin size, silver might be the best option..!
Re: Coin in 3D from a texture [message #43708 is a reply to message #43479 ] Thu, 09 February 2012 00:03 UTC Go to previous messageGo to next message
avatar philatkin  is currently offline philatkin
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123D catch won't work in this case as it fails miserably in the presence of specularity, and coins are notoriously shiny. If you painted the coin first in a matte paint it might work.

What might work better is to take the coin (if you have it physically) and do a rubbing of it with a very soft pencil or a dark wax crayon - this will give you a sort-of relief map of the surface which can then be scanned and used in Cheetah3D or similar modelling package to make geometry for manufacture by Shapeways.

But if you have the coin physically you can just make a silicone mould from it and cast it in a low melting point alloy.
Re: Coin in 3D from a texture [message #43715 is a reply to message #43708 ] Thu, 09 February 2012 00:22 UTC Go to previous messageGo to next message
avatar e.cachucho  is currently offline e.cachucho
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Thanks for the input.
I can see the problem regarding the mapping of the texture, as indeed the photographs I have have a lot of shine from the coin and deep shadows (I've attached the image of the coin).
I have traced the main outlines, but there is a lot of detail that would be missing i guess. Seems like a hopeless case?

index.php?t=getfile&id=14428&private=0

  • Attachment: COIN.jpg
    (Size: 496.03KB, Downloaded 546 time(s))

Re: Coin in 3D from a texture [message #43717 is a reply to message #43715 ] Thu, 09 February 2012 01:00 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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Definitely not a hopless case.. just may take some extra work.

I would still at least think about giving a program such as 123dcatch a try. One easy way to get around the specular hilights would be to make a plaster cast of the coin and then scan the cast, rather than the coin.

There are 3d scanning services out there, but if you're into do-it-yourself, there's also stuff like this: http://revision3.com/systm/laserscan


Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: Coin in 3D from a texture [message #43723 is a reply to message #43433 ] Thu, 09 February 2012 03:10 UTC Go to previous messageGo to next message
avatar dizingof  is currently offline dizingof
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A while back i did it with a presidential seal .. with some black&white manipulation techniques

http://www.shapeways.com/forum/index.php?t=msg&goto=2101 9&&srch=coaster#msg_21019

Turn a hi-res pic to b&w, adjust and play with the threshold , flip to negative then transfer from 2D to 3D

First attempt... (could be cleaned more)

index.php?t=getfile&id=14450&private=0



http://www.3Dizingof.com
Re: Coin in 3D from a texture [message #44189 is a reply to message #43723 ] Sun, 19 February 2012 19:48 UTC Go to previous messageGo to next message
avatar codexehow  is currently offline codexehow
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I can do this for you in ZBrush 4 if you have high resolution images. The more images, and the higher the resolution, the better.


www.tommycharlesportfolio.com
Re: Coin in 3D from a texture [message #44201 is a reply to message #43433 ] Mon, 20 February 2012 07:42 UTC Go to previous messageGo to next message
avatar Dotsan  is currently offline Dotsan
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There's lots of ways to do this, you can use Sculptris
or Photo 2 Rhino I used this for a Saxon Horn Project http://farm4.staticflickr.com/3203/5712500121_3dece08476_z.jpg 3D Drinking Horn Rim by Dot San, on Flickr]


www.dotsan.com
Re: Coin in 3D from a texture [message #44237 is a reply to message #44201 ] Tue, 21 February 2012 01:34 UTC Go to previous messageGo to next message
avatar 7777773  is currently offline 7777773
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Another possible option:
You could try making a paper rubbing of the coin.
Basically, this: http://en.wikipedia.org/wiki/Stone_rubbing

Scan the rubbing. Convert the scanned image into a monochromatic BMP. Then use the Shapeways Imagepopper to take the monochromatic tracing and turn it into a 3d model. You'd need to do this twice - one for each side - and there would likely need to be a bit of cleanup in the scanned 2D image stage, but it would be a fairly quick process to go from real to 3D this way.
Re: Coin in 3D from a texture [message #44695 is a reply to message #44237 ] Thu, 01 March 2012 04:02 UTC Go to previous message
avatar BigHache  is currently offline BigHache
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This could probably be done by converting the scan to greyscale and using that as a displacement map for a high res mesh. You'd just have to be mindful of the minimum details for whatever material you'd want this printed in.

 
   
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