[vtkusers] PolyData Translation Problem

[Wenlong Wang]

Hi David,

I'm afraid the problem is not caused by out of range. I put the
ResetCameraClippingRange in and defined the clipping plane as a large space,
but it still not working.

Wenlong

2011/10/27 David Gobbi <david.gobbi at gmail.com>

> The actor might be disappearing because it is no longer between the
> front and back clipping planes of the renderer.
>
> Try calling renderer->ResetCameraClippingRange() before window->Render().
>
>  - David
>
>
> On Thu, Oct 27, 2011 at 10:53 AM, Wenlong Wang <scc.wwl at gmail.com> wrote:
> > Hi David,
> >
> > Thank you for your advice.
> >
> > In my app, the scale and rotate is not ignored, they works. For
> translation,
> > I don't know, after I applied translation, the actor disappeared from my
> > screen. And the transform is not passed to actor but camera. For
> rendering,
> > I totally agree with you, I render the render window first time to show
> my
> > actor, then I apply all the transformation. At last, I render again to
> show
> > the changed actor.
> >
> > Wenlong
> >
> >
> >
> > 2011/10/27 David Gobbi <david.gobbi at gmail.com>
> >>
> >> The renderer automatically resets the camera on the first render,
> >> it resets both the field-of-view and the position.  That is why it
> >> "seems" like the position and scale are being ignored.  But they
> >> are not being ignored.  It is just that the renderer is automatically
> >> resetting the camera, and this causes the camera to move to the
> >> new actor location.
> >>
> >> The easiest way to avoid this is to render once (with the original
> >> position), then apply the UserTransform to the actor (or the
> >> vtkTransformPolyData), and then render again.  The camera
> >> reset will only occur on the first render.
> >>
> >>  - David
> >>
> >>
> >> On Thu, Oct 27, 2011 at 10:32 AM, Wenlong Wang <scc.wwl at gmail.com>
> wrote:
> >> > Hi, Jothybasu,
> >> >
> >> > Thank you very much for your reply.
> >> >
> >> > No, I didn't use it in my app. Does that matter? If so, why the scale
> >> > and
> >> > rotate functions works without vtkTransformFilter?
> >> >
> >> > Wenlong
> >> >
> >> > 2011/10/27 Jothybasu Selvaraj <jothybasu at gmail.com>
> >> >>
> >> >> Are you using vtkPolyDataTransformFilter along with vtkTransform?
> >> >>
> >> >> Jothy
> >> >>
> >> >> On Thu, Oct 27, 2011 at 5:13 PM, Wenlong Wang <scc.wwl at gmail.com>
> >> >> wrote:
> >> >>>
> >> >>> Hi everyone,
> >> >>>
> >> >>> I'm trying to scale, rotate and translate my polydata. My strategy
> is
> >> >>> using vtkTransform to do these operations one by one. The order is
> >> >>> scale,
> >> >>> rotate and translate. I calculate the transform parameters and use
> >> >>> vtkTransform::Scale, ::RotateZ() and ::Translate() to define the
> >> >>> transformation. Then I pass this transformation to my camera by
> >> >>> vtkCamera::SetUserTransform(). After that, I do the visualization
> >> >>> pipeline
> >> >>> again to show the new polydata object. And the visualization
> pipeline
> >> >>> is
> >> >>> capsualted as an independent function.
> >> >>>
> >> >>> So far, the scale and rotate works well and the polydata changes as
> I
> >> >>> expected. However, as I start to translate it, it disappears! It
> >> >>> doesn't
> >> >>> work even I put simple numbers as the input parameters.
> >> >>>
> >> >>> I tried to pass the transform to my actor and use
> >> >>> vtkActor::SetUserTransform to do it. But again, the scale and rotate
> >> >>> works
> >> >>> well and translate failed.
> >> >>>
> >> >>> Can anyone give me some advice? I'll be extremely appreciate it!
> >> >>>
> >> >>> Thank you very much!
> >> >>>
> >> >>> Best wishes
> >> >>> Long
> >
> >
>
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