how to make a camera

[deepthought]

why should i use glrotate with the yaw? glulookat does that for me

[gouessej]

why should i use glrotate with the yaw? glulookat does that for me

No, gluLookAt keeps your up vector as is:
http://www.manpagez.com/man/3/gluLookAt/

It is up to you to provide a correct up vector directly or to use several calls to glRotate in order to obtain the same result.

[tom]

No, gluLookAt keeps your up vector as is:
http://www.manpagez.com/man/3/gluLookAt/

It is up to you to provide a correct up vector directly or to use several calls to glRotate in order to obtain the same result.

His code is fine. There is only a problem if he looks in the exact UP or down direction. If that is likely to happen you should add a special case for that, otherwise pat yourself on the back and move on.

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[gouessej]

His code is fine.

According to you, the up vector is correct, isn't it? But he always provides (0,1,0). I don't understand why you think it is fine.

There is only a problem if he looks in the exact UP or down direction. If that is likely to happen you should add a special case for that, otherwise pat yourself on the back and move on.

Ok you're speaking about the both singularities at the south and the north poles (gimbal lock). I agree with you.

[tom]

Your right, I didn't read the whole tread and I thought he actually wanted an always up camera.

But if I understand the problem correctly now (probably not) then the easiest solution would be to use the matrices that are built into OpenGL. No need to mess around with Quaternions.

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gl.glLoadIdentity(); gl.glTranslate(atx, aty, atz); gl.glRotate(yaw, 1, 0, 0); gl.glRotate(pitch, 0, 1, 0); gl.glRotate(roll, 0, 0, 1);

[gouessej]

Your right, I didn't read the whole tread and I thought he actually wanted an always up camera.

But if I understand the problem correctly now (probably not) then the easiest solution would be to use the matrices that are built into OpenGL. No need to mess around with Quaternions.

1   2   3   4   5

gl.glLoadIdentity(); gl.glTranslate(atx, aty, atz); gl.glRotate(yaw, 1, 0, 0); gl.glRotate(pitch, 0, 1, 0); gl.glRotate(roll, 0, 0, 1);

The code above uses Euler transforms to combine 3 rotations so there is a risk of gimbal lock as I explained earlier