FPS - camera move parallel to the ground.

[techyvish]

Greeting,

I'm writing First Person Shooter and implementing FPS camera system using tutorial here.
http://www.ogre3d.org/tikiwiki/tiki-ind ... era+system

but I want camera moving by sticking to the ground. (parallel to the ground.). but whenever I try to look right/left (Yaw/Pitch) operation.
then try to do move operation, camera starts flying.

How do I control the camera, so camera move parallel to the ground ?
Thanks.

[duststorm]

Put the camera in a scenenode. Mouse tilt is applied only to the camera, while yaw is applied to the scenenode (with y axis constraint).
Movement keys move only the scenenode.

Edit: there is enough material already on this
http://www.ogre3d.org/tikiwiki/tiki-ind ... era+system
http://www.ogre3d.org/addonforums/viewtopic.php?t=1261

Ogre CCS also implements a first-person camera: http://ogre-ccs.sourceforge.net/?q=node/12

[techyvish]

Thanks for the reply, I am following same tutorial that you've mentioned in your reply.
But i m trying give touch inputs from UIView (overly over Ogre) in my iPhone application.

Below is code from my TouchView class's touchesMoved method.

Code: Select all

- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
    NSSet *allTouches = [event allTouches];
    
    for (UITouch *touch in allTouches) {
        
        
        if ([touch hash] == rotationPadHash && rotationPadMoving ){
            
            CGPoint touchLocation = [touch locationInView:self];
			
            
            float rotationdx = (float)rotationPadCenterx - (float)touchLocation.x;
            float rotationdy = (float)rotationpadCentery - (float)touchLocation.y;
                                            
            rotationPadCenterDistance = sqrtf((rotationPadCenterx - touchLocation.x) * (rotationPadCenterx - touchLocation.x) +
                                              (rotationpadCentery - touchLocation.y) * (rotationpadCentery - touchLocation.y));
            
            
            roationAngle = atan2(rotationdy,rotationdx);
            
            applicationRef->handleTouchInput(rotationdy, rotationdy);

And here is my application's handleTouchInput method.

Code: Select all

void ShootEmUp::handleTouchInput(Ogre::Real x , Ogre::Real y) {

    OIS::MultiTouchState state;
    int origTransX = 0, origTransY = 0;
    
    origTransX = x;
    origTransY = y;
    state.X.rel = -origTransY;
    state.Y.rel = origTransX;
    
    OIS::MultiTouchEvent event(NULL,state);
    
    m_pCamera->yaw(Degree(state.X.rel * -.1));
    m_pCamera->pitch(Degree(state.Y.rel * -.1));

}

above code is giving very odd camera movement. camera is continuously rotating around x axis.

When I use OIS input system that comes with the default XCode template it works fine because it passes correct Relative coordinates,
but I don't know how to pass correct Relative coordinates from UITouch. That's why I think my tilt ( not able to look left/right/up/down) movement is not working.

How do i pass correct Relative coordinates from UITouch ?

[techyvish]

Just looked at the OIS source code. this solved the problem.

Code: Select all

void iPhoneMultiTouch::_touchMoved(UITouch *touch)
{
    CGPoint location = [touch locationInView:static_cast<iPhoneInputManager*>(mCreator)->_getDelegate()];
    CGPoint previousLocation = [touch previousLocationInView:static_cast<iPhoneInputManager*>(mCreator)->_getDelegate()];

    MultiTouchState newState;
    newState.X.rel = (location.x - previousLocation.x);
    newState.Y.rel = (location.y - previousLocation.y);
    newState.X.abs = location.x;
    newState.Y.abs = location.y;
    newState.touchType |= 1 << MT_Moved;

    if( mListener && mBuffered )
    {
        mListener->touchMoved(MultiTouchEvent(this, newState));
    }
    else
    {
        mStates.push_back(newState);
    }
}