Challenge of OCTOBER

Questions, problems, comments and tips regarding the 3d scanning process.

Re: Challenge of OCTOBER

Postby Sven » Sat Oct 24, 2009 4:37 pm

Now I have found out why Mesh2Flash couldn't show the OBJ from Meshlab, and I have implemented a workaround. It was related to our "trick" of using texture without MTL file.
If you find more OBJs that Mesh2Flash can't read, please let me know.
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Re: Challenge of OCTOBER

Postby WalterMo » Sun Oct 25, 2009 8:56 am

Greg,

Yes, I am using a green and a red filter because these plastic foils were just lying around. And it works well.
Also your rotating leaf as a 3-D film is perfect to see.
I would like to know if all viewers have the impression, when the red filter is over the left eye, that the object seems to come out of the screen. And vice versa. That would be strange! And that would mean that our eyes and brain are programmed. :wink:

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Re: Challenge of OCTOBER

Postby Bongobat » Sun Oct 25, 2009 10:52 am

Walter,

In one picture you are actually seeing two seperate images. These images were taken by 2 virtual cameras. I placed one camera to the left of the object and named it left and the other to the right of the object and named it right. I then render these two images seperately and bring them into the anaglyph software. The sofware color encodes the left a red tint so that that image is only passed through the red lens of your glasses and to your left eye. and the right is color encoded a cyan tint so that it only passes through the cyan lens and to your right eye. In the software I can then adjust the 3D effect by moving the 2 overlapping color encoded images to give me what I want. For these I wanted the image to project out of the screen and for this to work as intended you must have the cyan lens over your right eye and the red lens over your left eye. When you switch them you are simply switching the cameras and seeing the left camera with the right eye and vice versa. Does this make sense? So everyone should see the same effect as long as the lenses are over the intended eye. Most red/cyan anaglyph glasses have the cyan lens over the right eye. If we had 3 eyes we could encode 3 images and see 3 images at once I wonder what that would be like :shock:

Im kinda just guessing at my virtual camera placement but they should emulate the eyes. I make a 4 pane window in my 3d program and make the top two windows a crosseyed stereo pair of the object. Since I have taught myself to freeview http://www.angelfire.com/ca/erker/freeview.html I can do a live preview of what the 3d is going to look like at the end.

EDIT: I wrongly said I made these red/blue anaglyphs but infact they are red/cyan so I fixed the text. :oops:

Greg
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livefreeview.jpg
Live freeview of stereo pair cameras in maya
DealExtreme red line laser, Microsoft Lifecam HD-5000
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Re: Challenge of OCTOBER

Postby santo » Sun Oct 25, 2009 12:34 pm

This message is particularly intended for Sven and Mattia.

I thank you both for your effectiveness and your kindness, thanks to
your competence, you allowed me to progress in the field of the
imagery 3D, and I also think, all the other members of the forum. You
can quite sour erase all my files of test, and keep only what is
interesting. The idea of the challenge of October is an excellent
idea, that made it possible to work on problems private individual of
fusion and visualization of texture. Why not continue with a
challenge of November, which could be, for example, digitalization of
objects shining, or transparencies. That could make it possible to
work, amongst other things, on the application of texture at
posteriori. I think of the translucent plastic or crystal
digitalization.

I hello all the forum, and especially all the voluntary ones which
ensures operation of it.

With all my friendship.

Pierre
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Mesh2Flash suggestion for all

Postby hal » Sun Oct 25, 2009 3:08 pm

Hello,

Pierre, I'm glad to be helpful. Thanks for your words.

Now, for all, a quick and usefull trick to decrease the files size of your Mesh2Flash contents:
- For the OBJ, try to reduce it more than you can (obviously without lost the correct shape) *;
- For the TEXTURE, you know that David save as .png. It's a good image format, but just a little big (file size)
you can quickly cut many Kb just editing the image and the .mtl file. Save the .obj with David and check that the "Save texture coordinates" is active.
After you have an .obj file, a .mtl file and your .png file. Open your favourite photo editing software (I've used Microsoft Paint) and load your .png file.
Save it as .jpg, with same name (don't change the file name). Open the .mtl file as a text file (I've used Microsoft NotePad) and find the name of the texture file.
Delete the ".png" text and replace with ".jpg" text. Save and close.
Now you can test if all is ok just deleting your .png texture and opening the obj into david ShapeFusion. You will see the mesh with the texture.
At the end you can upload the mesh and its texture into the web page, as you already well know.


I've tried this trick with my meshes and with Pierre's leaf. For this leaf image I'm starded with a .png of 826 Kb and created a .jpg of 120 Kb.
These solutions are aimed to a goal: keep the 3D contents in real time fast to load and fast to play (to browse in 3D view).

Hope that you find some usefulness in these infos Image,
Bye, Mattia

* To preserve a good quality of 3D browsing: I've tested that on my pc (please see the signature of my messages) the max number of polygons of the mesh mustn't be over 10k.
Just with 15k polys, the mesh (I mean only the obj without any texture) isn't any more fast and easy to navigate (the 3D browsing have a lack of frame rate).
PC: DELL M90, Intel T7200, 4 Gb Ram, nVidia Quadro 3500FX.
SO: Win 7 64Bit.
CAMs: USB CCD Color (1024x768, 30 fps) & Canon EOS 1000D.
LENS: 12 mm & VariFocal 3,5-8 mm.
PROJECTOR: ACER K11 & DELL M110.
LASERS: 5mW and 16 mW.
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Re: Challenge of OCTOBER

Postby santo » Mon Oct 26, 2009 8:16 pm

Just a flower to finish october

Attachments
fleur.obj
objet
(863.63 KiB) Downloaded 830 times
fleur.png
texture
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.
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Re: Challenge of OCTOBER

Postby Guybrush » Tue Oct 27, 2009 12:15 am

hi !

here is my entry for the challenge .

Image
Image

I'm new to david so i'm really happy to have this result after 1 week :D

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Re: Challenge of OCTOBER

Postby santo » Tue Oct 27, 2009 8:49 am

To Guybrush,

Very nice, what is your material ?

Pierre
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Re: Challenge of OCTOBER

Postby Guybrush » Tue Oct 27, 2009 6:17 pm

Santo : RS_GrayClay for Zbrush, really nice to sculpt with. :wink:
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Re: Challenge of OCTOBER

Postby santo » Tue Oct 27, 2009 7:02 pm

With my opinion, Guybrush has the Oscar for digitalization 3D of
sheet. A great cheer, but I will also like to see fusions 3D.
October is not finished yet, that quickly the new ones impassioned
present their œuvres to us.

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.
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Re: Challenge of OCTOBER

Postby Khalid Khattak » Wed Sep 29, 2010 4:18 pm

Hi October is coming again.. be prepared for rain of leaves here..
Regards
PC: Dell Inspiron i3, 2.27GHz,4GB RAM,64 bit windows 7
CAMERA:
David CCD Mono USB
LASER:
David 5mW Green line laser
PROJECTOR:
3D LED Mini Projector 250lumens, Native 1024x600
[b]http://free3dscans.blogspot.com/
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Re: Challenge of OCTOBER

Postby Khalid Khattak » Wed Oct 17, 2012 5:33 pm

:mrgreen: :mrgreen:
PC: Dell Inspiron i3, 2.27GHz,4GB RAM,64 bit windows 7
CAMERA:
David CCD Mono USB
LASER:
David 5mW Green line laser
PROJECTOR:
3D LED Mini Projector 250lumens, Native 1024x600
[b]http://free3dscans.blogspot.com/
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