[vtkusers] Changing the direction of Z

[Paul Harris]

On 16 October 2010 21:25, Bill Lorensen <bill.lorensen at gmail.com> wrote:

> You can use the vtkTransformPolyDataFilter
>
>
That will make a copy of the points and then adjust all the values, right?

There is quite a lot of points to plot, I was hoping to use an approach that
wouldn't involve using more memory.

Earlier, I tried this approach:
vtkTransform * flipform = vtkTransform::New();
flipform->Identity();
flipform->Scale(1,1,-1);
actor_flip->SetUserMatrix( flipform->GetMatrix() );

And that worked find *except* that all of the surfaces look dark, as if they
are facing away from the camera.

I looked around and tried adding vtkReverseSense to the chain, but that
didn't make any difference at all.

Should I be able to use SetUserMatrix?




>  On Sat, Oct 16, 2010 at 9:06 AM, Paul Harris <harris.pc at gmail.com> wrote:
> > The models themselves.   Flipping the ViewUp seems to be the same as
> turning
> > the monitor upside down, but that is not the result I want.
> > The problem is that Z in model coordinates is "downwards", but vtk seems
> to
> > insist that Z is "upwards".
> > This problem is not just for Z either,
> > I also have the situation where in some circumstances, the Y should point
> > the other way.   ie, Y means South rather than North.
> >
> >
> > On 16 October 2010 03:32, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> >>
> >> Do you want the models flipped, or just the view of the models?
> >>
> >> If it is the latter, you can set the ViewUp of the camera to 0,0,-1.
> >>
> >>
> >> On Fri, Oct 15, 2010 at 3:17 PM, Paul Harris <harris.pc at gmail.com>
> wrote:
> >> > Hi all,
> >> >
> >> > I have a VTK scene with some vtkPolyDataMappers and actors, plus an
> >> > orientation widget.
> >> >
> >> > I want to change the fundamental direction of the Z axis, so that it
> >> > points
> >> > down rather than up.  I want all of the models, the orientation
> widget,
> >> > etc
> >> > to flip, so that they point down instead of up.
> >> >
> >> > I've tried lots of things but have gotten nowhere...
> >> >
> >> > how do I make this happen?
> >> >
> >> > thanks
> >> > Paul
> >> >
> >> >
> >> >
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