/**
* Locally applies the inverse of this transform to the given vector: V' = M^{-1}*V
*
* @param theVector
* @return the transformed theVector.
* @throws NullPointerException if vector is null.
*/
public CCVector3 applyInverseVector(CCVector3 theVector) {
if (theVector == null) {
throw new NullPointerException();
}
theVector = theVector.clone();
if (_myIsIdentity) {
// No need to make changes
// V' = V
return theVector;
}
if (_myIsRotationMatrix) {
// Scale is separate from matrix so...
// V' = S^{-1}*R^t*V
theVector = _myMatrix.applyPre(theVector);
if (_myIsUniformScale) {
theVector.divideLocal(_myScale.x);
} else {
theVector.x = theVector.x / _myScale.x;
theVector.y = theVector.y / _myScale.y;
theVector.z = theVector.z / _myScale.z;
}
} else {
// V' = M^{-1}*V
final CCMatrix3x3 invertedMatrix = _myMatrix.invert();
theVector = invertedMatrix.applyPost(theVector);
}
return theVector;
}
/**
* Locally applies the inverse of this transform to the given point: P' = M^{-1}*(P-T)
*
* @param thePoint
* @return the transformed point.
* @throws NullPointerException if point is null.
*/
public CCVector3 applyInverse(final CCVector3 thePoint, CCVector3 theStore) {
if (thePoint == null) {
throw new NullPointerException();
}
if (theStore == null) theStore = new CCVector3(thePoint);
if (_myIsIdentity) {
// No need to make changes
// P' = P
return theStore;
}
// Back track translation
theStore.subtractLocal(_myTranslation);
if (_myIsRotationMatrix) {
// Scale is separate from matrix so...
// P' = S^{-1}*R^t*(P - T)
theStore = _myMatrix.applyPre(theStore);
if (_myIsUniformScale) {
theStore.divideLocal(_myScale.x);
} else {
theStore.x = theStore.x / _myScale.x;
theStore.y = theStore.y / _myScale.y;
theStore.z = theStore.z / _myScale.z;
}
} else {
// P' = M^{-1}*(P - T)
final CCMatrix3x3 invertedMatrix = _myMatrix.invert();
theStore = invertedMatrix.applyPost(theStore);
}
return theStore;
}
