Hi,
I'm making a fps style camera in a 3d game and was learning about Quaternions. I just want the camera to have pitch and heading, but no bank. And not track euler angles over multiple frames. Whats the best way to do this? The code I have looks like this.
I was wondering if this looks correct and is it equivalent to the below code, which is tracking Euler angles over frames.
Also in the first code snippet, is:
the same as:
Thanks for your help, any info about the best way to use Quaternions would be great.
I'm making a fps style camera in a 3d game and was learning about Quaternions. I just want the camera to have pitch and heading, but no bank. And not track euler angles over multiple frames. Whats the best way to do this? The code I have looks like this.
1 2 3 4 5 6 7 8 9 10 11 | //Get the change in mouse position V2 diff = normalize(v2_minus(mouseP, state->lastMouseP)); float sensitivity = 3; float angleX = sensitivity*diff.y*dt; float angleY = -sensitivity*diff.x*dt; Quaternion rot = eulerAnglesToQuaternion(angleY, angleX, 0); //rotate the camera orientation by the change in rotation camera.orientation = quaternion_mult(camera.orientation, rot); |
I was wondering if this looks correct and is it equivalent to the below code, which is tracking Euler angles over frames.
1 2 3 4 5 6 7 8 9 10 11 | static V2 eulerXY = {};
float sensitivity = 3;
float angleX = sensitivity*diff.y*dt;
float angleY = -sensitivity*diff.x*dt;
eulerXY.x += angleX;
eulerXY.y += angleY;
camera.orientation = eulerAnglesToQuaternion(eulerXY.y, eulerXY.x, 0);
|
Also in the first code snippet, is:
1 | camera.orientation = quaternion_mult(camera.orientation, rot); |
the same as:
1 | camera.orientation = quaternion_mult(rot, camera.orientation); |
Thanks for your help, any info about the best way to use Quaternions would be great.
Edited by Oliver Marsh
on
Reason: Initial post
I can't help you much but according to wikipedia, quaternion multiplication isn't commutative.
Thanks Martin and Simon,
Yes I think I understand a bit better. The banking is what prompted the question, the camera seemed to introduce bank after looking around, and I couldn't understand why. Could you say the tracking euler angles method has knowledge of the original 'correct' orientation, i.e. looking down the z axis (since we only ever rotate once from this orientation), whereas the first snippet only knows of it's previous frame orientation?
Thanks, Oliver
Yes I think I understand a bit better. The banking is what prompted the question, the camera seemed to introduce bank after looking around, and I couldn't understand why. Could you say the tracking euler angles method has knowledge of the original 'correct' orientation, i.e. looking down the z axis (since we only ever rotate once from this orientation), whereas the first snippet only knows of it's previous frame orientation?
Thanks, Oliver
Edited by Oliver Marsh
on