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Polygon count reduction with MeshLab for ShapeWays

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Polygon count reduction with MeshLab for ShapeWays [message #73095] Thu, 15 August 2013 05:05 UTC Go to next message
avatar grigr  is currently offline grigr
Messages: 1
Registered: September 2009
Go to my shop
Junior Member
I need Your Help! how do I setup MeshLab, to get a quality model?

There's a limit to the complexity of objects that you can upload to Shapeways: they can have no more than 1 million polygons.
ShapeWays made ​​a small tutorial: Polygon count reduction with MeshLab

but I do not like the quality of the models that I get this way Sad
on ShapeWays-picture I do not see these problems
https://www.shapeways.com/topics/udesign/tutorials/polygon_r eduction_with_meshlab/cars_high_2.png

ShapeWays just canceled one of my puzzle. here is a picture that they gave:

I did everything as written in the instructions:
1) picture of the original model

2) The model image after processing

3.1) a list of options that I used

3.2) a list of options that offers us ShapeWays

[Updated on: Thu, 15 August 2013 05:07 UTC]

grigorusha Living Puzzle Shop: http://www.shapeways.com/shops/grigorusha
my youtube video: http://www.youtube.com/user/grigrme
my photo-stream: http://www.flickr.com/photos/grigorusha
Re: Polygon count reduction with MeshLab for ShapeWays [message #73098 is a reply to message #73095 ] Thu, 15 August 2013 05:37 UTC Go to previous messageGo to next message
avatar AmLachDesigns  is currently offline AmLachDesigns
Messages: 1404
Registered: September 2011
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Shapie Expert

I think you need to do some work on the model you are starting with.

The 'before' picture from Netfabb has the warning triangle showing which means there are errors that need fixing, and from the results of your Decimation it looks like you may have extra mesh in certain places or maybe mesh that is not watertight/well-attached.

Each part in your model should be a watertight mesh and the different parts must overlap.intersect, they cannot have faces, edges or vertices existing at the same location.

Good luck!
Re: Polygon count reduction with MeshLab for ShapeWays [message #73106 is a reply to message #73098 ] Thu, 15 August 2013 13:20 UTC Go to previous messageGo to next message
avatar JACANT  is currently offline JACANT
Messages: 756
Registered: July 2011
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Senior Member
Looking at the images of the faults. I would repair it in Netfabb.
In Netfabb choose Repair. Do not do an automatic repair, instead hover over the icons on the tool bar. Here you can pick triangles, faces or shells, depending on what you want to do. On the first image it looks like you can delete the thin parts by picking those thin faces. If any of the triangles, faces or shells are red you can invert them. If there are any holes, i.e. yellow lines you can close them.
If you upload the file to the forum or by PM I will take a look for you.
Re: Polygon count reduction with MeshLab for ShapeWays [message #73428 is a reply to message #73095 ] Thu, 22 August 2013 04:29 UTC Go to previous message
avatar aeron203  is currently offline aeron203
Messages: 0
Registered: July 2008
Go to my shop
Junior Member
I recommend that you re-export your model from the original software with more appropriate settings. Those tiny fillets each have dozens of facets that would not be seen in the final print. To maintain the fidelity of the larger curved shapes while simplifying the small ones, you would adjust the STL export settings so that the angular tolerance is very large, like 30 degrees. Set the deviation tolerance to a value such as o.o2mm. That way the smallest fillets will only have three segments, while the large features will have as many as needed to keep the accuracy. This model with should print with around 200,000 polygons, with no noticable difference in quality.

If you still have trouble, or if you need to print several at once, go ahead and replace those fillets with chamfers. The visual difference is minimal, but it will make your life much easier.

Aaron - 40westdesigns.com/blog

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