Prepare Models For 3D Printing

[Exhale]

Hi there,

What process do you use for hollowing the shell (wall thickness) ?
For example after using PhotoScan® it is necessary for making bust or other many prints.
The scanned data is very thin.
Any advice?
 
Cheers

[Alexey Pasumansky]

Hello Exhale,

Seems like similar task has been already discussed, so I hope that the following thread will be useful: http://www.agisoft.ru/forum/index.php?topic=2049

[Behold]

You may also simply do a poisson reconstruction in meshlab. The result would be solid though. I believe you may also have to reapply texture. I will check out the thread you suggested

[Exhale]

Hi,
Thanks Alexey and Behold.

Behold, poisson effects the quality of the mesh. Perhaps need to try another solution.

[Behold]

I agree but it depends on your settings. For instance. I have very faithful results when i use the command line poissonrecon at a depth of 12.

[Behold]

sorry, i should have also offered the cmd line reconstruction as a suggestion too. I forgot it until you reminded me that meshlab's settings didn't mesh (no pun intended) with my needs

[chadfx]

You also might try looking at Meshmixer for creating shells:

http://www.youtube.com/watch?v=ILKspBZjSDM&feature=c4-overview&list=UU0OsvzcGE6iqSP8lW3-M9Dg
http://meshmixer.com/forum/index.php?topic=1672.0

[FoodMan]

far from perfect... depending on the mesh you could end up with lots of artefacts.. with thin parts notably.. or pointy parts...

best bet :

Load your Pscan model in 3D coat voxel room..
(make sure you import your model as voxels)
close holes or fix parts if needed
then right click on the layer item - create hull using voxels..
done in 2 sec. and no artefatcs
re-export your model
Import in Pscan to replace your actual non hulled model
do a texture job.. done.

hope that helps.

[Exhale]

chadfx , FoodMan    Thank you guys, I appreciate it.
Both sounds interesting.. I will give a go and let you know my experience.   

Cheers,

[eduardoestrada85]

Hi Foodman
wath is the recomended thickness?

tnx in advance

[FoodMan]

hello

well it all depend on your model real size... (a small 10cm object would need only around 5mm thickness... while a large 60cm would require 7mm to a 1 cm or more.).  and on the specifications of the 3D printer you're going to use...

SLA will give you a stronger print .. while Powder printers will output a print that can brittle easier..

f/

Best is to ask the print bureau, they will tell you.

[meshmixup]

Hello foodman, I have not tried 3d coat yet. You said close holes / fixed part, does it correct the manifold etc? When I export from pscan and import to other apps such as mudbox, it always prompt some errors on manifold. I am not sure if it affects the print out. So I want to find an app best to fix the mesh with minimal effort

[FoodMan]

yes it has a special open function that will check your scan for holes, manifolds, etc..

then you can use the smooth tool if needed to remove unwanted noisy parts or whatever you need to do..

then as I said you just create a hull using a command... and voila..

Furthermore, when the hull is done you won't see any changes in your model, but you can hide some parts easy to check the thickness.. 

I will try to post a few screenshots this week-end that show the exact procedure... so stay tuned for more.. hehe

f/

[eduardoestrada85]

Tnx Foodman

Waiting for ypur screenshots

Cheers

Eduardo

[FoodMan]

here is how...

you have a model done in Pscan.. export it as obj. ( here it is textured, but for now you can skip the texturing)