[Insight-users] question on inverse transform

[kingaza at gmail.com]

Hi all,

I got the inverse transform

	TransformType::Pointer inverseTransform = TransformType::New();
	transform->GetInverse(inverseTransform);

and Now I want to get the parameters of inverse transform:

	typedef TransformType::ParametersType ParametersType;
	ParametersType inverseParameters = inverseTransform->GetParameters();

	const double inverseVersorX             = inverseParameters[0];
	const double inverseVersorY             = inverseParameters[1];
	const double inverseVersorZ             = inverseParameters[2];
	const double inverseTranslationX		= inverseParameters[3];
	const double inverseTranslationY		= inverseParameters[4];
	const double inverseTranslationZ		= inverseParameters[5];

	TransformType::MatrixType inverseMatrix =
inverseTransform->GetRotationMatrix();
	TransformType::OffsetType inverseOffset = inverseTransform->GetOffset();

But the inverseParameters are ZEROS while inverseMatrix and
inverseOffset are seems right:

Transform = 
 versor X      = 0.000145543
 versor Y      = -2.15933e-005
 versor Z      = -0.000379622
 Translation X = 1.95512
 Translation Y = -2.30325
 Translation Z = 0.602563

Matrix = 
1 0.000759237 -4.3297e-005
-0.000759249 1 -0.000291069
4.3076e-005 0.000291102 1
Offset = 
[1.79904, -2.05726, 0.528728]


Inverse Transform = 
 versor X      = 0
 versor Y      = 0
 versor Z      = 0
 Translation X = 0
 Translation Y = 0
 Translation Z = 0

Matrix = 
1 -0.000759249 4.3076e-005
0.000759237 1 0.000291102
-4.3297e-005 -0.000291069 1
Offset = 
[-1.80062, 2.05574, -0.529249]

Could anyone help me?
any tip is appreciated!

Regards,
Kingaza