private float speed = 3;
private double theta;
private double phi;

public void move(){
        theta = Math.toRadians(pitch);
        phi = Math.toRadians(yaw);
        if(Keyboard.isKeyDown(Keyboard.KEY_W)){
            position.x+=(speed * Math.sin(phi) * Math.cos(theta));
            position.z-=(speed * Math.cos(phi));
            position.y+=(speed * -Math.sin(theta));
        }
        if(Keyboard.isKeyDown(Keyboard.KEY_D)){
            position.x+=speed * Math.cos(phi);
            position.z+=speed * Math.sin(phi);
        }
        if(Keyboard.isKeyDown(Keyboard.KEY_A)){
            position.x-=speed * Math.cos(phi);
            position.z-=speed * Math.sin(phi);
        }
        if(Keyboard.isKeyDown(Keyboard.KEY_S)){
            position.x-=(speed * Math.sin(phi) * Math.cos(theta));
            position.z+=(speed * Math.cos(phi));
            position.y-=(speed * -Math.sin(theta));
        }

        if(Keyboard.isKeyDown(Keyboard.KEY_Q)){
            position.y-=speed;
        }

        if(Keyboard.isKeyDown(Keyboard.KEY_E)){
            position.y+=speed;
        }
        if(Keyboard.isKeyDown(Keyboard.KEY_RIGHT)){
            yaw+=speed/2;
        }
        if(Keyboard.isKeyDown(Keyboard.KEY_LEFT)){
            yaw-=speed/2;
        }

        if(Keyboard.isKeyDown(Keyboard.KEY_UP)){
            pitch-=speed/2;
        }
        if(Keyboard.isKeyDown(Keyboard.KEY_DOWN)){
            pitch+=speed/2;
        }