Orbiting camera around a point using quaternions

[mohammad_aburrub]

Hi Guys
I have the following code that successfully rotates the whole world around a given point in the space but I need the camera to orbit around the point instead of the world:


Camera::OrbitCamera(Vector3 point, float angle)
{
myCamQuaternion *= AxisAngleToQuaternion(myCamUpVector, angle);
myCamViewMatrix = myCamQuaternion.QuaternionToRotationMatrix();
glTranslatef(-point);
glMultMatrixf(myCamViewMatrix);
glTranslatef(point);
}

The modelview duality is still confusing, I want to see the world stationary and the camera orbiting instead of a stationary camera and rotating world.
thanks for help

Hi, is Mohammad==Silvia?
In your example is the use of quaternions pointless, just glRotate around the vector.

How was it in the Lou Reed tune...
He shaved his leg and then he was a she
Hey babe
talk a walk on the wide side
Doot, doo doot, doo doot, doo doot doo doot
Doot, doo doot, doo doot, doo doot doo doot...

[Orzech]

Originally posted by rh:
In your example is the use of quaternions pointless, just glRotate around the vector.

That's not any answer, rh.

Sorry - I don't know much about quaternions really.

[mohammad_aburrub]

excuse me ! who is Silvia , I did not get your point

Let me introduce you to Silvia: http://www.opengl.org/discussion_boa...ML/014297.html
http://gamedev.net/community/forums/...opic_id=186925

Posting as Silvia instead of Mohammad may give more replies but asking "how do I move the camera instead of the world?" is confusing. Everything will of course be clear now when Orzech will post the definite answer.

[mohammad_aburrub]

Dear RH

let me congratulate you on the sense of humor you have
and the way u try to detect things and link opengl.org with gamedev.net
but I think this time your analysis is not correct, may be I share with
Silvia the same stupid question but that does not mean I am Silvia, Any how
thanks for introducing Silvia to me, I hope will become three friends and if
that is not OK, at least on the technology level

[silvia_steven_2000]

Hey RH and Moe

can you calarify to me what the hell is going on between u about me !!!

Go for it Moe!
I am sure that you and Silvia will have a life long and close relationship filled with love.

May I also wish you all the best for the future and dont forget who introduced you to each other. Perhaps will it be a little rh in the future?

[silvia_steven_2000]

Dear RH

I think it is the time to quit this funny game, I had an experience in hacking,
cracking, stealing passwords, faking IDs, spoofing, software exploits,
if you have heard about netbus, I developed my own spy software,
I had real fun in the early days of the internet but this time I did this just for fun
and I was aware that somebody (like you for example) might notice that mohammad_aburrub
and silvia_steven_200 are the same person. I did not forget the fact that both moe and
Silvia asked the same question simply because I do not care if this is revealed or not

why did I insist that they are two different people ? let me be honest with you:

1) I used a girl name: simply because girls attract everything
around and this idea worked and I got allot of replies, but believe me I
did it for fun at the first place because eventually I do not care if my
question is not solved, I can research more and more and find a solution,
I solved the problem myself and my camera class is fully working now.

2) why did not I tell you the truth at the beginning and let Silvia talk to me and you
do not go that far in thinking, I also loved to have some fun but in my mind I would
not like to keep it secret for ever but you detected that early (congratulations)

OpenGL.org is a serious place on the web, it is not a good idea to switch it
to a chat room. I am so sorry and I do apologize for every body in the
forum if that is offensive in a way

now if you do not mind, it is a great pleasure for me to be a friend of mine,
at least on the technical level

My name is Mohammad Aburrub
Origin Palestine
Currently work as QA Engineer at www.pdf.com - San Jose

Great but are you not taking things a bit too serious? I would never waste time trying to find out if two posters are identical. I answered Silvias question and after that read the post from Mohammad. It was obvious from the same person.

Dont do the crime if you cant do the time.