Another Question...rotating on two axis

Question

Hi again. Well I have yet another question...how do I set a translation to rotate on two axis? Like I know that I can do:
TransformGroup tg;
Transform3D t3d = new Transform3D();
t3d.setRotation(new AxisAngle4f(1f,0f,0f,(some angle)));
tg.setTransform(t3d);
for one axis (I just put the declarations in to show an example) but if I try to apply two set rotations or two Transform3D's it doesn't work...so how would I rotate on, say, both the x and the y axis? Thanks,
Compaq

Answer 1

in fact the best thing would be to get used to quaternions. I suppose some Java3D tutorials discribe it quite well.
If you really want to use rotation on axis you have two solutions :
create 2 Transform3D and apply the result
Transform3D t3dx = new Transform3D();
t3dx.setRotation(new AxisAngle4f(1f,0f,0f,(xangle)));
Transform3D t3dy = new Transform3D();
t3dy.setRotation(new AxisAngle4f(0f,1f,0f,(yangle)));
t3dx.mul(t3dy);
tg.setTransform(t3dx);
(hum, at least i suppose it would work ;)
or you can do that too :
Transform3D t3dx = new Transform3D();
t3d.setRotation(new AxisAngle4f(1f,yangle/xangle,0f,(xangle)));
tg.setTransform(t3d);
(in this case xangle must be != 0)
I'm not really sure it will work so please tell me if it works. I've tried to help you twice today so you can send me some bucks to the folowing address :
oh, ok mum i won't give our address on the internet ;)
c ya
GnG