Hi,
i'm trying to rotate a rod (part of a 3rd party model) on its Y asxis. I read
on OSG Startguide that to do it, i need to find the correct position of my
object from the origin and apply a multiplication like T * M * -T.
The source code that tries to do it is the follow
Code:
ing:
printVector(" Original amtRod trans: ",
amtRod->getWorldMatrices()[0].getTrans());
printVector(" Original amtRod rotate: ",
amtRod->getWorldMatrices()[0].getRotate());
printVector("\t amtRod center: ",
amtRod->getBound().center());
osg::Vec3 offset = amtRod->getWorldMatrices()[0].getTrans();
printVector("\t amtRod offset = ", offset);
osg::Matrix get =
osg::Matrix::translate(-amtRod->getBound().center() - offset);
osg::Matrix m = amtRod->getMatrix() *
osg::Matrix::rotate(rotation, osg::Vec3(0,1,0));
osg::Matrix put = osg::Matrix::translate(
amtRod->getBound().center() + offset);
amtRod->setMatrix( get * m * put );
printVector("\t get.getTrans = ", get.getTrans());
printVector("\t m.getRotate = ", m.getRotate());
printVector("\t m.getTrans = ", m.getTrans());
printVector(" Current amtRod trans: ",
amtRod->getWorldMatrices()[0].getTrans());
printVector(" Current amtRod rotate: ",
amtRod->getWorldMatrices()[0].getRotate());
(printVector only prints the osg::Vec3 or a osg::Quat in a file).
The result isn't what i expect, since it rotates the rod but also translate it,
as the following output demonstrates:
Original amtRod trans: (0, 0, -309)
Original amtRod rotate: (0, 0, 0)
amtRod center: (6.55547, 150.952, -142.15)
amtRod offset = (0, 0, -309)
get.getTrans = (-6.55547, -150.952, 451.15)
m.getRotate = (0, -0.130526, 0)
m.getTrans = (79.9751, 0, -298.471)
Current amtRod trans: (-36.5678, 0, -315.54)
Current amtRod rotate: (0, -0.130526, 0)
What's wrong in my reasoning?
Thank you for help!
Cheers,
Axel
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=35586#35586
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