[vtkusers] rotating a cube

[Mike Jackson]

If I am understanding you correctly, you have a "model" ( a cube in  
this case ) that you would like to rotate about the models center.  
THis is how I achieve this.

Say I have some PolyData that defines my bounds. To put a "Bounding  
Box" around it I do the following:

//Read is an STLReader;
double   _bounds[6];
double   _center[3];

reader->GetOutput()->GetBounds(_bounds);
reader->GetOutput()->GetCenter(_center);
_center[0] *= -1.0; _center[1] *= -1.0; _center[2]  *= -1.0;
vtkActor *_boundingBoxActor = vtkActor::New();
vtkOutlineSource *outline = vtkOutlineSource::New();
outline->SetBounds(bounds);
outline->Update();

vtkPolyDataMapper *outlineMapper = vtkPolyDataMapper::New();
outlineMapper->SetInput(outline->GetOutput() );
_boundingBoxActor->SetMapper(outlineMapper);

// Here is your Answer......
_boundingBoxActor->SetPosition(_center);
///Then just add the actor to your scene....



On Mar 7, 2006, at 2:10 AM, Jessica Weiner wrote:

> How can I rotate a cube actor around its own axis like a see-saw? I  
> tried
> RotateZ but it changes the center position of the actor as well. I  
> want to
> be able to rotate the cube _without_ changing its center.
>
> Any ideas?
>
> Thanks.
> Jess
>
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--------
Mike Jackson
imikejackson <at> gmail <dot> com