Here is the biut where io check to see if i am in a hill:
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//check to make sure the camera is not inside the hills
if( cam_pos.y < heightMapArray[(int)cam_pos.x][(int)cam_pos.z] + 10){
float tmpYpos, var;
printf("cam_pos.x = %d\n",(int)cam_pos.x);
printf("cam_pos.y = %d\n",(int)cam_pos.y);
printf("cam_pos.z = %d\n",(int)cam_pos.z);
printf("Height at that point: %d\n", (int)heightMapArray[(int)cam_pos.x][(int)cam_pos.z] );
tmpYpos = ( heightMapArray[(int)cam_pos.x][(int)cam_pos.z] ) + 20;
printf("tmpYpos = %d\n",(int)tmpYpos);
//make sure the view wont go to funky when i change this
var = tmpYpos - cam_pos.y;
//set the view to the var
cam_view.y += var;
printf("Cam_view.y: %d\n",(int)cam_view.y);
//redisplay the camera
gluLookAt(cam_pos.x, tmpYpos ,cam_pos.z,cam_view.x,cam_view.y,cam_view.z,0,1,0);
}else{//if camera
gluLookAt(cam_pos.x,cam_pos.y,cam_pos.z,cam_view.x,cam_view.y,cam_view.z,0,1,0);
}//if
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This bit is the camera function which changes the view and position of the camera when i zoom
// v-- zoom camera moves the camera and viewing position towards or away.
//--------------------------------------------------------
void camera_zoom(float speed){
float normaled;
COORDS look;
//work out where the camera is looking, same calculation as the distance from the sun
//only using the camera position and view coords
look.x = cam_view.x - cam_pos.x;
look.y = cam_view.y - cam_pos.y;
look.z = cam_view.z - cam_pos.z;
//normalise the increment, this is to avoid massive increase or decrese in zoom
normaled = math_calcMag(look);
look.x /= normaled;
look.y /= normaled;
look.z /= normaled;
//move the x and z position of camera, but check against the heightmap array to get the right height
cam_pos.x += look.x * speed;
cam_pos.y += look.y * speed;
cam_pos.z += look.z * speed;
//move the x and z view of camera aswell to create a stable view
cam_view.x += look.x * speed;
cam_view.y += look.y * speed;
cam_view.z += look.z * speed;
}//camera_move()
//--------------------------------------------------------
// ^-- zoom camera moves the camera and viewing position towards or away.
