Hello Guys:
Delta3d has this solved. I have used their little part of the code
and it appears to work nicely. I forgot which file it is in and it
uses osg Matrices. You can create a Matrix from the Quaternion and
then pass this to the Delta3d's routine to extract the euler
parameters. Just download the source and look in one of their
matrixutil.cpp under src/dtUtil/matrixutil.cpp. You will find the
HprToMatrix and MatrixToHpr.
Take care
Garrett
On Apr 4, 2007, at 7:46 PM, Brad Colbert wrote:
Wow, big response. Thanks for all the help. I'll let you all know
how it goes.
Thanks,
Brad
---
Brad Colbert
Renaissance Sciences Corporation
W: 480 290-3997
F: 425 675-8044
________________________________
From: [EMAIL PROTECTED] on behalf of Paul Speed
Sent: Wed 4/4/2007 2:25 PM
To: osg users
Subject: Re: [osg-users] How do I retrieve the Heading, Pitch, and
Roll froma quat?
A google of "quaternion to euler" yielded this as the first link:
http://www.euclideanspace.com/maths/geometry/rotations/conversions/
quaternionToEuler/index.htm
Looks right to me on first inspection.
I think from OSG's perspective the issue is that yaw/pitch/roll aren't
particular useful in the context of a quaternion. They are
ambiguous at
best and misleading at worst since it is very order dependent, ie:
is it
yaw+pitch+roll or is it roll+pitch+yaw.
It is very useful information to display to the user but not very
useful
otherwise.
-Paul
Gordon Tomlinson wrote:
Sadly OSG for some reason does not provide this:( thats a win for
Vega
Prime it does provide it :)
You have to extract it either from a matrix or the Quat which is not
that straight forward to do
One trick that helps is to make sure your Quat's and matrices are
always created the same way
But it is doable to extract the info in a reliable method
I have a solution that works pretty well at work but unfortunately
I'm
not at liberty to distribute it publicly (sorry)
If your search the net you can find solutions that will help get you
there with some tweaking
/Best Regards /
//
/Gordon/
__________________________________________________________
/Gordon Tomlinson
//Email / : gordon.tomlinson @ overwatch.com/
YIM/AIM/: Gordon3dBrit
/MSN IM /: Gordon3dBrit @ 3dSceneGraph.com
__________________________________________________________
//Telephone (Cell)//:/ (+1) 214-477-8914
Telephone (Work)//:/ //(+1) 703-437-7651//
"Self defence is not a function of learning tricks
but is a function of how quickly and intensely one
can arouse one's instinct for survival"
- */Master Tambo Tetsura/*
-----Original Message-----
*From:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
*Brad Colbert
*Sent:* Wednesday, April 04, 2007 5:02 PM
*To:* [email protected]
*Subject:* [osg-users] How do I retrieve the Heading,
Pitch,and Roll
from a quat?
Hi folks,
I polked around and couldn't find the answer for this. How
does one
retrieve the heading, pitch, and roll angle from a quat for
display?
Thanks,
Brad
---
Brad Colbert
Renaissance Sciences Corporation
W: 480 290-3997
F: 425 675-8044
---------------------------------------------------------------------
---
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
<winmail.dat>
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
