RE: [Algorithms] Camera

[Stephan R. <ke...@be...>]

Thanks Garett, I will take a look at that link.

To try to elaborate a bit more on what I'm looking for.

I'm looking to write a camera class that can rotate any given amount in
any given axis from any given orientation. Basically similar to my 3D
Solid Modeler camera's I use for my mechanical engineering at work
(Autodesk Inventor). I can rotate the camera freely in any axis from any
orientation without having even the slightest deviation in any axis that
I don't want to rotate in.

I hope this explains it a bit more.

The game I'm working on in my free time, will only require yaw/pitch
when played (1st person view). However in editing mode I want a complete
free rotating flying camera so that my artist has complete freedom of
movement when editing the world to place objects, etc.

Also for future projects, I may need a camera that has complete freedom
of movement. Therefore I want to write this class right the first time
around to be universal and work for any application I need it to.

Thanks,

Stephan


-----Original Message-----
From: gda...@li...
[mailto:gda...@li...] On Behalf Of
Garett Bass
Sent: Friday, August 29, 2003 4:48 PM
To: gda...@li...
Subject: RE: [Algorithms] Camera

Stephan,

You can find some sample camera code using quaternions here:

	http://personal.nbnet.nb.ca/daveg/opengl/camera/index.html

Note that, pitching up 90 degrees, yawing right 90 degress, then
pitching
down 90 degrees, is the same as simply rolling right 90 degrees.
Perhaps
the roll you are experiencing is due to the order in which your
rotations
are applied?

I'm not sure I understand what you're trying to acheive.  If it is your
intent that yaw should always be relative to the world's vertical axis,
then
you may need to consider a different approach.  Perhaps you could store
a
pitch vector and a yaw vector, and cross the two to create a roll vector
per
frame?  This would allow you to flip over completely, but when you're
looking straight up, world yaw == camera roll.

It may be helpful to have a more complete explanation of the effect you
are
looking for.  Will this camera represent the viewpoint of a person
standing
upright on the ground, or an astronaut floating free in space, or
something
else entirely?

Regards,
Garett Bass
gt...@st...


-----Original Message-----
From: gda...@li...
[mailto:gda...@li...]On Behalf Of
Stephan
Rose
Sent: Saturday, August 30, 2003 1:52 PM
To: gda...@li...
Subject: RE: [Algorithms] Camera


Thanks for your responses everyone, but even using quaternions I just
cannot
get this to work right.

If I take my input from my mouse to yaw and pitch the camera, the inputs
are
all delta angles, create my delta quaternion from that, multiply that by
my
existing orientation to get the new orientation, I still get the roll
problem. Even if I normalize the new orientation quaternion afterwards,
no
difference.

Where am I going wrong here? How do I properly determine the new target
orientation based on my current orientation and the delta?

Thanks,

Stephan



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