[vtkusers] vtkAssembly : restore postion and rotation stored in quaterion ?

[agerlach]

I have a function that converts quaternions to euler axis rotation and our
math is a little different. I know there are more then one ways to do the
conversion but I know mine works so using your notation:

double angle = 2. * acos(qw);
double ax = 1./sin(angle/2.)*qx;
double ay = 1./sin(angle/2.)*qy;
double az = 1./sin(angle/2.)*qz;

assembly->RotateWXYZ(360 - vtkMath::DegreesFromRadian(angle), ax, ay, az)

This is from "Aircraft control and simulation" by Stevens

I hope this helps.



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