----- Original Message -----

From: opgobee

To: reconstruct_users@yahoogroups.com

Sent: Tuesday, March 21, 2006 5:34 PM

Subject: [Reconstruct] Suggestion for smoothing?

Hi!

I'm using Reconstruct since one and a half month and very satisfied
with it. It's stable, fast, offers good possibilities and the 3D
rendering is very nice. But I have the following problem that I
couln't solve yet. Maybe somebody could offer a suggestion.

I need to smoothen the object (unfortunately I cannot attach a
screenshot). Due to the section images that don't allow perfect
tracings, the 3D object is 'spiky', i.e. has an irregular wall. I
tried using the simplify tool on whole objects as explained in a
earlier posting on this message board, but didn't manage to find a
resolution that gives a real improvement. Either there is no visible
effect or it becomes too coarse. It gives the impression it
simplifies in 2D, so each section separately. What I would need
would be a kind of 3D averaging(so over several consecutive
sections) to average out spikes and irregularities.

At our lab we have Amira (http://www.tgs.com/) that smoothens really
nicely. However I chose for Reconstruct as Amira(to our knowledge)
doesn't allow tracing of coloured images - one first has to split up
the image into separate red, green and blue channels - losing the
combination of information. Also, the Amira version we have doesn't
handle usage of a large stack of high res images, which Reconstruct
does troublefree. To nevertheless benefit from Amira's nice
smoothening capacity, I tried tracing in Reconstruct, then importing
(as VRML2) in Amira. Unfortunately, one needs the information per
section to use Amira's smoothening. I also tried Viz-Up
(http://www.vizup.com/) but that also only became coarse; tried
Chisel (http://www2.hrp.no/vr/tools/chisel/install.htm) that
improved slightly but nothing coming close to Amira. Many 3D
programs that maybe could do the job (e.g. 3D Studio Max) are
exuberantly expensive.

Does anyone have any suggestion?
- e.g. for a reasonably priced program that does smoothen well?
- or how to import the Reconstruct sectional data (the files with
number extensions) into Amira
- or how I could get Reconstruct itself to do it after all?

Thanks for any suggestion and once more thanks for the great tool
Reconstruct!

Paul Gobée
Dept. Anatomy, LUMC, Leiden, Netherlands






 
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