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Basic Quaternion camera math

Started by Dark_Streak Jul 16, 2003 at 8:34 AM 3 replies 1.1k views

Original Post

Jul 16, 2003 at 8:34 AM

Hello, Could anyone please give me some pointers/clues on how to go about doing the following? My question concerns quaternions, something I am new to and am currently struggling with. I am using quaternions for my in-game camera, whereas I am more familiar with Eular angles. Anyway, once I have found the current quaternion of my camera, I would like to set the camera''s up vector to {0,1,0} i.e. straight up. So, how do I set a specific ‘vector’ within a quaternion?

JohnBolton

132

JohnBolton

Jul 16, 2003 at 5:47 PM

quote:
Original post by Dark_Streak
...I would like to set the camera''s up vector to {0,1,0}...

Do you mean you want to rotate the camera so that its up vector is (0,1,0)?

Plotless

Jul 16, 2003 at 6:34 PM

Hi it''s me, I lost my email account (and therefore password) so I had to start a new account

Yes, JohnBolton, thats what I mean.

Basically, my quaternion camera is following an object around (third person viewing). I do this by setting the camera with the objects orientation (in quaternion form too) and then applying a translation offset to set the camera back behind the object. The objects orientation undergoes various rotations, such as rolling and pitching. Now, I dont want the camera to inherit these rotations, as it skews up my camera''s up vector! I still want to give the camera the same orientation as the object, but just revert my upvector to be straight up. I dont know how to do this with quaternions

Sorry, it''s difficult for me not to think of the camera in terms of vectors - Im really struggling with this quaternion stuff. Any tips are appreciated.

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