[vtkusers] vtkTransform::Concatenate followed by Inverse results in Identity (VTK 6.3.0)

[Torsten Sadowski]

Hello,

I am trying to design my own vtkTDxInteractorStyle. When I looked into 
vtkTDxInteractorStyleCamera as an example I found something puzzling 
which might be a bug in either vtkTransform or vtkTDxInteractorStyleCamera.

This snippet from voidvtkTDxInteractorStyleCamera::OnMotionEvent

//Gettherotationaxisinworldcoordinates.

this->Transform->Identity();

this->Transform->Concatenate(eyeToWorld);

this->Transform->Inverse();

this->Transform->TransformVector(axisEye,axisWorld);

does nothing useful because the Transform returns the identity after Inverse (checked with PrintSelf).
This on the other hand works:

//Gettherotationaxisinworldcoordinates.
this->Transform->SetMatrix(eyeToWorld->GetMatrix());
this->Transform->Inverse();
this->Transform->TransformVector(axisEye,axisWorld);

I'm baffled.

Best Regards,
Torsten Sadowski


-- 


Dr.-Ing. Torsten Sadowski
Turbine Design/System Integration

WINDnovation Engineering Solutions GmbH
Stralauer Platz 33-34
10243 Berlin
Germany
Phone: +49 30 547195 34
Fax:   +49 30 547195 39
Managing directors:
Dr.-Ing. Roland Stoer, Dipl.-Ing. Albrecht Kantelberg
Registered at Amtsgericht Charlottenburg, HRB 110081 B

www.windnovation.com

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