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Why does this look so bad? [message #46716] Tue, 10 April 2012 01:38 UTC Go to next message
avatar Malcr001  is currently offline Malcr001
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I'm new to shapeways so I was hoping someone can help. Ive uploaded the 3D as an .obj file and this is the result I get:

http://www.shapeways.com/model/534020/455b2938ad481032e4563f d7b29bce94

My question is why does this look so bad. Its not smooth at all. Under blender and maya its nice and smooth.

I recently read a thread about how 3D printers cannot read any smooth modifiers and so you need to convert everything to polys. That is what has been done, is it a matter of smoothing it out even more??


Edit:
I think its to do with the dimensions. There not showing up right at all. The diamter of the dome should be 16.2cm

[Updated on: Tue, 10 April 2012 01:52 UTC]

Re: Why does this look so bad? [message #46717 is a reply to message #46716 ] Tue, 10 April 2012 02:05 UTC Go to previous messageGo to next message
avatar damocles  is currently offline damocles
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That last bit, 6.4 inches is 16.3 cm, 6.4 mm is 0.64 cm. When you upload, there's a drop-down to select units since the common file types are unitless. You probably selected mm, but needed inches based on how you exported it.

Depending on how you export it, there are a number of ways in which the quality of the mesh could vary. Increasing the polygon count and reducing the error tolerance can help...different programs have different ways of representing this. However, if you set it too high, you'll go over the 64MB upload limit. Something like 100k to 200k polygons is ample for most models.
Re: Why does this look so bad? [message #46727 is a reply to message #46717 ] Tue, 10 April 2012 14:36 UTC Go to previous messageGo to next message
avatar Malcr001  is currently offline Malcr001
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Thanks for the reply. Yep its because I set it to millimeters instead of inches. I've noticed on large items white strong and flexible polished isnt available? But when the model was set using millimeters the option was available. Does this mean theres a size limit to the models they can polish?

I have tried to increase the polys as much as possible. Unfortunatly the model shot up from 20mb to about 300mb simply by adding another division although I think it should be ok.

Because the WSF polished option wasent available I just selected white strong & flexible. Does this mean my models going to be sent to me with a rough texture?

[Updated on: Tue, 10 April 2012 14:37 UTC]

Re: Why does this look so bad? [message #46728 is a reply to message #46727 ] Tue, 10 April 2012 14:45 UTC Go to previous messageGo to next message
avatar damocles  is currently offline damocles
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There's more info on the WSF polishing process here:

http://www.shapeways.com/materials/wsfpolished

The tumbler will only fit 15x15x15cm, while the printer will do 65x35x55cm.

WSF isn't all that rough, although it depends a bit on the local geometry. There's a somewhat textured feel to it. I'd see how it turns out, then hand-finish if necessary.
Re: Why does this look so bad? [message #46730 is a reply to message #46728 ] Tue, 10 April 2012 15:15 UTC Go to previous messageGo to next message
avatar Malcr001  is currently offline Malcr001
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15cm means my models 1.2cm too big. Thats a bummer seeing as my model cannot be scaled down as its designed to be mounted onto a base plate.
Re: Why does this look so bad? [message #46745 is a reply to message #46730 ] Tue, 10 April 2012 17:26 UTC Go to previous messageGo to next message
avatar stop4stuff  is currently offline stop4stuff
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Rotate the model with relation to the axis before uploading so it fits the bounding box Wink

[edit]And while you're at it, make sure you save the file as stl binary and if it is still too big, zip it up - its an upload limit, not a model file size limit Cool

[Updated on: Tue, 10 April 2012 17:30 UTC]

Re: Why does this look so bad? [message #46748 is a reply to message #46745 ] Tue, 10 April 2012 18:02 UTC Go to previous messageGo to next message
avatar Malcr001  is currently offline Malcr001
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stop4stuff wrote on Tue, 10 April 2012 17:26

Rotate the model with relation to the axis before uploading so it fits the bounding box Wink

[edit]And while you're at it, make sure you save the file as stl binary and if it is still too big, zip it up - its an upload limit, not a model file size limit Cool




Unfortunatly the width length were both 16.2cm and the height was 8cm seeing as its a dome.

I tried all sorts of methods in terms of exporting and the I did just that which was export an stl file and zip it up. Zipping it crunched it down to a about 30% of its origonal size however safeways computers couldent handle the file size of the unzipped stl file and reported a problem.

I ended up using a model with less polys hopefully its not visible when its printed.
Re: Why does this look so bad? [message #46759 is a reply to message #46748 ] Tue, 10 April 2012 19:58 UTC Go to previous messageGo to next message
avatar stop4stuff  is currently offline stop4stuff
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Rotating a 16.2 diameter x 8.1 cm (8.1cm height as I don't have the inclination to do any more than a simple hemisphere) dome by 45 degrees on two axes comes in at 15.059586 x 15.059586 x 13.827576 cm, maybe make it 50 degrees and it'll fit

As for polys, 0.1mm sided faces are spot on for most materials, for FUD go for 0.05mm. Are you sure you didn't hit the 1 million triangle limit? 1M triangles = 500k 4 sided polys. binary stl* with 1 million triangles, zipped up should come in somewhere between 25 & 45MB.

*There are two kinds of stl, ASCII and binary. Binary stl files come in at around 1/3 the size of ASCII stl files.

[edit] I just got the same dome in under (just) the 15cm box - 14.785797 x 14.359528 x 14.849655 to be precise

[Updated on: Tue, 10 April 2012 20:01 UTC]

Re: Why does this look so bad? [message #46762 is a reply to message #46759 ] Tue, 10 April 2012 20:17 UTC Go to previous messageGo to next message
avatar Malcr001  is currently offline Malcr001
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To give you a better idea this is dome that I sent to be made:

http://www.shapeways.com/model/534407/49cb7caee2c4aa0e675719 4b65a3c8dd

It is quite possible that I hit the limit as I didnt check at the time.
The tri count on this thing is 444162 so I most likely did hit the limit when trying to add another division.
Re: Why does this look so bad? [message #46763 is a reply to message #46762 ] Tue, 10 April 2012 20:35 UTC Go to previous messageGo to next message
avatar stop4stuff  is currently offline stop4stuff
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That 'domed cylinder' won't fit in a month of Sundays, hey ho... a 15cm square will fit in a 21 cm diameter circle, and your model will definately fit through the same 21cm so it may be worth asking Shapeways Customer Services (service@shapeways.com) if they can help you out.

Re: Why does this look so bad? [message #46770 is a reply to message #46763 ] Tue, 10 April 2012 21:37 UTC Go to previous messageGo to next message
avatar Malcr001  is currently offline Malcr001
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stop4stuff wrote on Tue, 10 April 2012 20:35

That 'domed cylinder' won't fit in a month of Sundays, hey ho... a 15cm square will fit in a 21 cm diameter circle, and your model will definately fit through the same 21cm so it may be worth asking Shapeways Customer Services (service@shapeways.com) if they can help you out.




Thanks I emailed shapeways hopefully they will get back to me soon.
Re: Why does this look so bad? [message #46805 is a reply to message #46770 ] Wed, 11 April 2012 13:07 UTC Go to previous messageGo to next message
avatar Malcr001  is currently offline Malcr001
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They got back to me and basically said its not possible. Obviously the polishing machine automates the process but can ony do this within a certain size. I would like to see people make a request for a polishing machine that can handle a larger models during shapesways live in about 6 hours.
Re: Why does this look so bad? [message #46818 is a reply to message #46805 ] Wed, 11 April 2012 19:24 UTC Go to previous messageGo to next message
avatar stop4stuff  is currently offline stop4stuff
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Oh well, at least you now have the definitve answer.

Head over to http://feedback.shapeways.com/ for suggestions & feedback for Shapeways services and website.

Re: Why does this look so bad? [message #46825 is a reply to message #46818 ] Wed, 11 April 2012 20:03 UTC Go to previous message
avatar Malcr001  is currently offline Malcr001
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stop4stuff wrote on Wed, 11 April 2012 19:24

Oh well, at least you now have the definitve answer.

Head over to http://feedback.shapeways.com/ for suggestions & feedback for Shapeways services and website.




Thanks. I posted the suggestion.

 
   
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