Strange Interior Geometry

[Mark Rogal]

What causes this strange geometry on the inside of our 3D scans when exporting out of Skanect? And how to get rid of it on export or if thats not possible how to repair externally? Want a solid 3D model. thanks

[Joseph Larson]

That's the alien parasite in your body that Scannect is picking up on. Nothing to worry about. Totally normal.

Okay, seriously, I have no idea.

[Nicolas Burrus]

Is this the output after making the mesh watertight? How does it look like before applying the watertight command?

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[Roel Veldhuyzen]

What happens there is pretty easy to explain. What happens is that during the scan there are some artifacts/data points that end up inside the scanned object. Light hit the sensor the wrong way, alignment was wonky for a sec, or something along those lines, whatever the reason, there are data points inside. There are also some holes in the object, parts that didn't get scanned, these can be tiny spots, under the arms, between the legs, the top of the head, or just in creases in clothing. A piece that didn't get data points. When converting the scan data to a mesh the software sees points inside, and it sees holes, now it thinks that you scanned a hollow object and it tries to connect everything to the best of it's ability, giving you an object, or person in this case, that seems to have been hollowed out by alien worms :P

If the object is perfectly scanned and there are no holes in it, the software should ignore the points inside and just make the whole thing solid, but a few tiny holes will make it do crazy stuff like this.

I haven't been able to find an easy way to fix this. I usually bring the mesh into Zbrush for clean up and a bit of corrective sculpting. During that process I'll try to close those pesky little holes. Then I'll run a Remesh on it, to get a nicer mesh with a lot less vertices. ZRemesher will usually fix those holes and get rid of the internal structure. If it doesn't I'll bring the mesh into Maya and clean it up manually, but it can be a real pain.

[Mark Rogal]

Yes filled holes.

[Tobby Ryan]

Mark,
I am glad you asked that question.
I see you are using MeshMixer to edit your models.(nice Aquaman btw)

These are Pockets that have or are CLOSE to being filled.   when filling the outside, they still have geometry inside the model. How to remove them, you ask. Look no further, i have the answer!!

Inside Meshmixer:
click on EDIT
then MAKE SOLID
    In Make Solid, you will wish to set a few options.(as i use this way to resolve pockets all the time)  

Solid Type: Accurate
Color Transfer Mode: Vertex to Vertex
Solid Accuracy: 512
Mesh Density: 512
Offset Distance: Leave at 0
Min Thickness: 10
Cull Edges Threshold: leave at 100

After you hit Update and apply, you can remove the original version (keep the "solid" version that was just created.)
This will not entirely remove the pockets, but will definitely bind them as separate shells.

You can then go back to Edit and hit Separate Shells

This will make the pockets seperate objects instead of with the original main model part
you can delete these pockets.

(I usually Hide the top version...aka the main), so you only see the pockets before you delete them to make sure you don't delete the main model

If you still have pockets when you re-highlight the main, unhide, then hide again to view the mesh, then you have a few spots that you have not sealed up yet.

After fixing the surface that is giving you the pocket, you can re-do the same thing to "fix" the pocket issue again.


Hope this helps!

Tobby

[Tobby Ryan]

hopefully when you get finished, you can view the hologram version and not  have any pockets.  btw, i do this to ALL my models before going back to skanect and re-loading the ply, to upload to Shapeways.
i ALWAYS have pockets to begin with. I fill the holes, then do the solid/seperate to remove them.   Even with a MendelMax 1.5 or prusa printer, you will notice these will try to be "Air" pockets, during print. I know that you may have to repeat the solid, update, apply, seperate feature a few times, but it just works for me.

On Thursday, April 7, 2016 at 4:41:38 PM UTC-4, Tobby Ryan wrote:

Mark,
I am glad you asked that question.
I see you are using MeshMixer to edit your models.(nice Aquaman btw)

These are Pockets that have or are CLOSE to being filled.   when filling the outside, they still have geometry inside the model. How to remove them, you ask. Look no further, i have the answer!!

Inside Meshmixer:
click on EDIT
then MAKE SOLID
    In Make Solid, you will wish to set a few options.(as i use this way to resolve pockets all the time)  

Solid Type: Accurate
Color Transfer Mode: Vertex to Vertex
Solid Accuracy: 512
Mesh Density: 512
Offset Distance: Leave at 0
Min Thickness: 10
Cull Edges Threshold: leave at 100

After you hit Update and apply, you can remove the original version (keep the "solid" version that was just created.)
This will not entirely remove the pockets, but will definitely bind them as separate shells.

You can then go back to Edit and hit Separate Shells

This will make the pockets seperate objects instead of with the original main model part
you can delete these pockets.

(I usually Hide the top version...aka the main), so you only see the pockets before you delete them to make sure you don't delete the main model

If you still have pockets when you re-highlight the main, unhide, then hide again to view the mesh, If you still have pockets, then you have a few spots that you have not sealed up yet.

[Mark Rogal]

Thanks Tobby I'll be trying this today. Btw my best buddy from college is names Tobby. Your the only other person I've ever heard to have the same name. Thought it was a unique name. Not Toby, Tobby. Lol

[Tobby Ryan]

Wow, 2 b's, I haven't met anyone in person with 2.

I am sure this will help. I have a class at our local MakerSpace on the 26th, I will be doing an intro to MeshMixer class.  for Saturday the 30th, i am going to scan 10 people, and thier project will be

[Mark Rogal]

I'll tell him he will freak. Where you at? Maybe I'll go to your class ;)

[Tobby Ryan]

LOL Knoxville TN. for me this is all a hobby. I love to tinker.