Hi, I do something similar to what I think you want to do. To calcluate the rotation to be applied I use osg Matrix method 'makeRotate(Vec3 from, Vec4 to)'. For the from I use the up axis of the model (in your case +ve x) and for the to I use the local up provided by the Ellipsoid used for the terrain.
Cheers, Brad -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ethan Fahy Sent: Monday, 12 December 2011 11:38 PM To: [email protected] Subject: Re: [osg-users] [vpb] Placing an object on a UTM file generated with osgdem Object rotation is the last piece of this puzzle. When on object is placed on a geocentric terrain using the methods outlined in this thread, the object always appears to be oriented correctly upwards with respect to the center of the earth. However I'm not sure how it is being oriented with respect to its rotation. Does anyone have any insight into this? For example if I know that my object's internal coordinate system specifies that positive x is north and positive y is west and I place that object on an arbitrary WGS84, geocentric terrain, how will I know how to rotate the object to line up the north orientation? ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44344#44344 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ------------------------------------------------------------------------- DISCLAIMER: This e-mail transmission and any documents, files and previous e-mail messages attached to it are private and confidential. They may contain proprietary or copyright material or information that is subject to legal professional privilege. They are for the use of the intended recipient only. Any unauthorised viewing, use, disclosure, copying, alteration, storage or distribution of, or reliance on, this message is strictly prohibited. No part may be reproduced, adapted or transmitted without the written permission of the owner. If you have received this transmission in error, or are not an authorised recipient, please immediately notify the sender by return email, delete this message and all copies from your e-mail system, and destroy any printed copies. Receipt by anyone other than the intended recipient should not be deemed a waiver of any privilege or protection. Thales Australia does not warrant or represent that this e-mail or any documents, files and previous e-mail messages attached are error or virus free. ------------------------------------------------------------------------- _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
