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  Where is the rotation in a Matrix4f?  (Read 663 times)
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Offline SEZ

Junior Newbie




Java games rock!


« Posted 2004-05-16 05:20:25 »

Hello,
        I'm not to good at matrices sorry.
 Could anyone tell me which part of the Matrix has the rotation?

 I have a ViewTransform and I want to get its direction(angle) and then set the transform to rotate the MD3 model I have to be in the same direction as the view.

 Thanks for any help :-).
SEZ

P.S. This is my first post :-D, I've been viewing the forum for a while :-).
Offline Jens

Senior Member




Java for games!


« Reply #1 - Posted 2004-05-16 07:50:48 »

Quote
Hello,
        I'm not to good at matrices sorry.
 Could anyone tell me which part of the Matrix has the rotation?


The rotational component is the upper left 3x3 matrix.


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Offline SEZ

Junior Newbie




Java games rock!


« Reply #2 - Posted 2004-05-16 12:43:57 »

Thanks for that seesm to be moving me along :-).

But I find that the players model, although it turns with the view in changes in size up and down as I turn and then goes back to normal at the rear of where it started been OK.

 Here is what I'm doing:

       Transform3D playerTrans = player.getTransform();
       
       Matrix3f pm3f = new Matrix3f();
       pm3f = playerTrans.getRotation(pm3f);
     
       Matrix3f vm3f = new Matrix3f();
       vm3f = viewTransform.getRotation(vm3f);
       
       pm3f.m00 = vm3f.m00;
       pm3f.m02 = vm3f.m02;
       
       pm3f.m20 = vm3f.m20;
       pm3f.m22 = vm3f.m22;
       
       playerRotTrans.setRotation(pm3f);
          
       player.setTransform(playerTrans);

Thanks again  :)

SEZ
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Offline SEZ

Junior Newbie




Java games rock!


« Reply #3 - Posted 2004-05-16 12:47:40 »

Oh sorry about that, I just fixed it I had a transfrom below which I thought was needed to change the scale of the model, and well it seems it was doing it.

Thanks very much :-D.
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