This is my free roaming camera code..how do i implement it such that it is not able to move outside my room box and stays within the boundaries?


//this function updates camera object, which implements free roaming camera
void freeRoamCamera(void)
{
VECTOR vMove = {_VAR(0), _VAR(0), _VAR(0)};
VECTOR vForce = {_VAR(0), _VAR(0), _VAR(0)}; //temp variables for moving and rotating the camera

//update camera rotation variables based on mouse input, and multiply by mouse sensitivity
vForce.x = _VAR(-1*MOUSE_SENSITIVITY*_FLOAT(v(mouse_force).x)*FLOATV(time_frame)); //set pan angle variable
vForce.y = _VAR(MOUSE_SENSITIVITY*_FLOAT(v(mouse_force).y)*FLOATV(time_frame)); //set tilt angle variable
//set roll based on q and e keys
vForce.z = _VAR((FLOATV(key_e) - FLOATV(key_q))*FLOATV(time_frame)); //set roll angle variable

//update camera position variables based on keyboard input W,A,S,D,home,end keys
vMove.x = _VAR(CAMERA_SPEED*(FLOATV(key_w) - FLOATV(key_s))*FLOATV(time_frame)); //set forward variable
vMove.y = _VAR(CAMERA_SPEED*(FLOATV(key_a) - FLOATV(key_d))*FLOATV(time_frame)); //set sideways variable
vMove.z = _VAR(CAMERA_SPEED*(FLOATV(key_home) - FLOATV(key_end))*FLOATV(time_frame)); //set upward variable

//update the camera's rotation and position
vec_add((VECTOR*)&v(camera).pan, &vForce); //rotate camera based on vForce variable

vec_rotate(&vMove, (ANGLE*)&v(camera).pan); //rotate vMove variable in direction of camera
vec_add((VECTOR*)&v(camera).x, &vMove); //move camera position based on vMove variable
}

Take a look at:
clamp - http://www.conitec.net/beta/aclamp.htm

Basicly clamp every coordinate (x,y,z) to the specific boundaries.

Take a look at my two camera codes that I contributed. They are very simple. What you then do is have an entity and have the camera c_trace it like I did the player. If there is something between the camera and the object you can just have it zoom in. Altough xartor's idea will work, it seems like your will need to clamp every single room, which might suck for you