speed.y = (rotMatrix.m01 * x) +
pSpeed.y = (rotMatrix.m01 * x) +
  private void rotateVectorSpeed(Vector3f speed) {    float x = speed.x,        y = speed.y,        z = speed.z;    speed.x = -1 * ( (rotMatrix.m00 * x) +                    (rotMatrix.m10 * y) +                    (rotMatrix.m20 * z));    speed.y = (rotMatrix.m01 * x) +        (rotMatrix.m11 * y) +        (rotMatrix.m21 * z);    speed.z = -1 * ( (rotMatrix.m02 * x) +                    (rotMatrix.m12 * y) +                    (rotMatrix.m22 * z));  }