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DAVID-Laserscanner Forum • View topic - symmetrical scan
Dear DAVID Community,

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symmetrical scan

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

symmetrical scan

Postby santo » Thu Jun 25, 2009 8:09 am

Hello with all,

How can one carry out a symmetrical scan ? (reverse image left right-hand side), that should be interesting to decrease the number of scan when scanin object which has an axis of symmetry.

Thank you by advance,

Cordially,
Pierre
David Laserscaner version 2.4.5 avec licence, Centrino dual core 2 GHz, 4 GOct mémoire, non focusable laser rouge, moteur pas à pas + réduction de 1 / 470.
  Pierre
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Re: symmetrical scan

Postby RAYA » Thu Jun 25, 2009 8:38 pm

Hi

With DAVID you can use mirror while scanning ,this decrease your scanning time .

But if you mean that can shape fusion mirror your scan ,the answer is not ,shape fusion does not designed

to be a reverse engineering software only scanning software.


RAYA
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Re: symmetrical scan

Postby MagWeb » Fri Jun 26, 2009 7:37 am

Hi,

Hey RAYA, if something isn´t designed to do a job doesn´t that mean that you cann´t abuse something: :)

Should be no problem for objects being symmetrical to an center axis ( something that could be done on a lathe, a egg, a cone....):
Simply do one scan and load it several times to SHAPEFUSION (or duplicate it). Alignment has to be done by hand (manual mode + fine registration, but you would need to do so, also having several realy scanned meshes);

Little more complicated an object being symmetrical to a plane. This needs to be mirrored:
:arrow: So define the mirrorplanes lying with one point on the origin AND owning the normal vectors (x=1;y=0;z =-1) as the left mirror plane and (x=-1; y=0; z=1) as the right mirror plane in the advanced settings.
:arrow: Load your scan twice;
Hide scan A
:arrow: Rightclick on scan B in the list
:arrow: Choose "reflect on mirror planes"
:arrow: Combine both resulting mirrored meshes to one
Show scan A
:arrow: Align ScanA and Combined ScanB_left /ScanB_right
Attachments
Mirror.jpg
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Re: symmetrical scan

Postby RAYA » Fri Jun 26, 2009 9:18 am

Hi Dear Gunter

As you know definning a mirror plane (any plane ) need more tool and option that shape fusion has .

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Re: symmetrical scan

Postby MagWeb » Fri Jun 26, 2009 9:39 am

MagWeb
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Re: symmetrical scan

Postby RAYA » Fri Jun 26, 2009 10:04 am

Hi again

If I want to define a plane with three point how can I do that ? or with a line and a point or have offsetting plane ?

RAYA
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Re: symmetrical scan

Postby MagWeb » Fri Jun 26, 2009 11:03 am

Hi,

To define a plane with ONE point and a normal vector:

You've to define the 3D coordinates of one single point A that is part of the plane.
And a normal-vector, which is perpendicular to the plane, and shows the direction the plane looks towards.
To define this vector , that starts at A you only have to define the 3D coordinates of a point B(the end of the vector) relative to A (as if A would be the 3D origin)

Gunter.
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Re: symmetrical scan

Postby RAYA » Fri Jun 26, 2009 7:48 pm

Hi

Sorry ,but think you don`t understand my mean.

if you worked with any CAD software (catia,proe,...) before ,you should note that there is many way to define plane,which is needed for mirroring any surface or any volume.

RAYA
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Re: symmetrical scan

Postby MagWeb » Fri Jun 26, 2009 8:37 pm

Hi,

I´m talking about a plane not about some geometric shape (not e.g. a rectangle). A plane owns no edges and doesn´t end somewhere...

Gunter

Edit: Added a fusion result done the way described above, while the other "half" was erased - all "editing " was done in SHAPEFUSION
Attachments
Mirrored.jpg
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