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How not to lose resolution when saving.

The place for all topics related to the 'Shapefusion' tool of DAVID.

How not to lose resolution when saving.

Postby mirkin » Mon Oct 17, 2011 10:21 pm

Hi,

When I load an .obj into shape fusion then save it out without doing a thing to it the resulting file is half the
size of the original. I'm wondering if I'm losing any resolution there?

The original .obj was created via a david scan and I've a licensed version.
mirkin
 
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Re: How not to lose resolution when saving.

Postby WalterMo » Tue Oct 18, 2011 1:01 pm

Hi,
Did you really lose resolution?
I have just made some tests and you are right, the file size is about the half after the first saving. This was new for me, I never had noticed it.
But if we continue in the same manner, the file size doesn't drop any more. The resolution of a scan depends on the number of the vertices and triangles (faces) and these numbers are all time the same.

You can check it yourself, click with the right mouse button in Shape Fusion on the name of the uploaded file (DAVID V2). Under 'Properties' you will find these informations.

Walter

PS. The fusion was made from the original coin scan.
Attachments
QuartetBildMünzen.jpg
Original(36MB), first(20MB), second(20MB) saving. Poisson 500 fusion(16.8MB)
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Re: How not to lose resolution when saving.

Postby mirkin » Tue Oct 18, 2011 6:07 pm

I can't see any visual loss of resolution or any less geometry reported. You just wonder where that 50% of the file size
has gone??
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Re: How not to lose resolution when saving.

Postby Sven » Sun Oct 23, 2011 10:30 am

There is no loss in quality.
In 3D-Scanning, DAVID always saves texture coordinates in the OBJ file.
In Shapefusion, DAVID saves texture coordinates only when there really is a texture.
The 3D vertices and faces in the files are identical.
If you compare your two OBJ files with a diff tool, you will see it. :D

Sven
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