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Re: Augmented Reality [Re: fogman] #327198
06/05/10 03:26
06/05/10 03:26
Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB Offline
Expert
EvilSOB  Offline
Expert

Joined: Feb 2008
Posts: 3,232
Australia
Found my cam and now ... Cool Fun !!

As a point of interest, I notice that the models REALLY hate going upside down.

As that part of the rotation problem you're having?

Or is it the marker fails to recognise that way?

Or is there no way of knowing at this stage? (NO, I cant post video)


[EDIT] i found this quote deep in the ArToolkit forums. Hope its of some use...
Quote:

The rotation is cleanly represented by for example a quaternion or a 3x3
rotation matrix, not as you suggest by roll, yaw and pitch (also known
as Euler angles). The reason is that Euler angles are not clean is that
it can possibly suffer from an effect that is called the Gimbal lock. If
you need Euler angles anyway (as i did) you can calculate the Euler
angles from a matrix with the code found on this site:
http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToEuler/index.htm
Keep in mind that the order of the Euler angles is important for the
calculation, and for where the gimbal lock exactly occurs




Last edited by EvilSOB; 06/05/10 04:42.

"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
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Re: Augmented Reality [Re: EvilSOB] #327211
06/05/10 08:11
06/05/10 08:11
Joined: May 2005
Posts: 2,713
Lübeck
Slin Offline OP
Expert
Slin  Offline OP
Expert

Joined: May 2005
Posts: 2,713
Lübeck
I of course found that as well and am doing something similar, but that doesn't change the need to transform between the different coordinate systems. I am not sure about the upset down flipping. It is probably both, on the other hand, it doesn't really happen in the examples, so it might be only related to my wrong transformation.

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