[Ves] Bug in computeDisplayToWorld (on iOS)?

[Thomas H]

Hi all,

I believe there is a bug in the computeDisplayToWorld method of
vesRenderer. To me it appears as if rotation is not taken into account
properly. If I do the following in VTK, the sphere remains at the same
position on display after rolling by 90 degrees:

vtkActor *aSphere = vtkActor::New();
double world[4];
vtkInteractorObserver::ComputeDisplayToWorld(renderer, 204.408, 199.874,
0.660146, world);

aSphere->SetPosition(world[0], world[1], world[2]);
renderer->GetActiveCamera()->Roll(90);
vtkInteractorObserver::ComputeDisplayToWorld(renderer, 204.408, 199.874,
0.660146, world);
aSphere->SetPosition(world[0], world[1], world[2]);

The sphere remaining at the same place is the behavior I would expect. If,
however, I do the same in ves (on iOS), the sphere does not remain at the
same place, but appears to be rotated by 180 degrees.

Any chance this is a bug? I have trouble explaining this issue differently.
I'd be happy to post more code (in particular ves code), but I am a bit
cluess what to post (other than the entire project).

Best,

Thomas
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