FPS Camera

Nox587 · Post by **Nox587** » Mon Jul 10, 2006 6:46 pm

First of all, great engine, just started using it and its very easy to understand! So thanks

Now, I'm pretty new to 3d game programming, and I'm just trying to educate myself...found this engine is a good place for me to start.

i'm attempting to make an FPS camera system, I know the engine already has one, but I want to create my own (learning exp). I want to "attach" this camera to a character, and make the controls behaive like an FPS.

I managed to get the character to move forward/backwards, and strafe left and right, but now I'm stuck with camera movement. I read somewhere there is a "special" way to create scene nodes for an FPS camera, I think one is supposed to be for horiz movement, the other for vertical....not sure about that though. My biggest problem is that I don't know how to translate mouse movement to a 3-dimensional rotation. Furthermore I'm not sure how to perform the slerp operation from the mouse movement data.

I know I need to create 2 quaternions, and plug them in (with a time var) to the slerp method...but where do I get the quaternions, and how do I get them from mouse movement?

Thanks for any help!

TheGameMaker · Post by **TheGameMaker** » Mon Jul 10, 2006 7:27 pm

just parent the camera to the node....

the mouse movement isn´t that a big problem... just have an rect mouseOldPos, and a mouseNewPos, and one called mouseSpeed, then in your main loop (or anywhere else)

you write something like

mouseNewPos=getMousePos;
mouseSpeed=mouseOldPos-mouseNewPos;
mouseOldPos=mouseNewPos

node->setRotation(vector3df(mouseSpeed.X,mouseSpeed.Y,0)+node->getPosition());

TGM

Nox587 · Post by **Nox587** » Mon Jul 10, 2006 7:29 pm

Perhaps I was not clear enough...I have already parented the camera to the node. I have basic walking, but I don't have rotation working. I don't know how to take the amount the mouse moved and translate that into how much a character/camera should rotate, I actually want it to slerp...

TheGameMaker · Post by **TheGameMaker** » Mon Jul 10, 2006 7:54 pm

update^^ i wasn´t able to reab sry

Nox587 · Post by **Nox587** » Mon Jul 10, 2006 8:33 pm

That makes sence, I'll try it when I'm in front of a compiler. I'm assuming performing that every time the mouse moves will give me a smooth rotation? I'll try it out when I am at home, thanks much!

Nox587 · Post by **Nox587** » Tue Jul 11, 2006 6:04 pm

Just wanted to say this worked out great for me, thanks for the info!

stodge · Post by **stodge** » Tue Jul 11, 2006 6:58 pm

Post some code!

TheGameMaker · Post by **TheGameMaker** » Wed Jul 12, 2006 8:53 am

everytime nice, to hear, that I was able to help someone