Hi David,<br><br>Thank you for your advice.<br><br>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.<br>
<br>Wenlong<br><br><br><br><div class="gmail_quote">2011/10/27 David Gobbi <span dir="ltr"><<a href="mailto:david.gobbi@gmail.com">david.gobbi@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
The renderer automatically resets the camera on the first render,<br>
it resets both the field-of-view and the position. That is why it<br>
"seems" like the position and scale are being ignored. But they<br>
are not being ignored. It is just that the renderer is automatically<br>
resetting the camera, and this causes the camera to move to the<br>
new actor location.<br>
<br>
The easiest way to avoid this is to render once (with the original<br>
position), then apply the UserTransform to the actor (or the<br>
vtkTransformPolyData), and then render again. The camera<br>
reset will only occur on the first render.<br>
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- David<br>
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<br>
On Thu, Oct 27, 2011 at 10:32 AM, Wenlong Wang <<a href="mailto:scc.wwl@gmail.com">scc.wwl@gmail.com</a>> wrote:<br>
> Hi, Jothybasu,<br>
><br>
> Thank you very much for your reply.<br>
><br>
> No, I didn't use it in my app. Does that matter? If so, why the scale and<br>
> rotate functions works without vtkTransformFilter?<br>
><br>
> Wenlong<br>
><br>
> 2011/10/27 Jothybasu Selvaraj <<a href="mailto:jothybasu@gmail.com">jothybasu@gmail.com</a>><br>
>><br>
>> Are you using vtkPolyDataTransformFilter along with vtkTransform?<br>
>><br>
>> Jothy<br>
>><br>
>> On Thu, Oct 27, 2011 at 5:13 PM, Wenlong Wang <<a href="mailto:scc.wwl@gmail.com">scc.wwl@gmail.com</a>> wrote:<br>
>>><br>
>>> Hi everyone,<br>
>>><br>
>>> I'm trying to scale, rotate and translate my polydata. My strategy is<br>
>>> using vtkTransform to do these operations one by one. The order is scale,<br>
>>> rotate and translate. I calculate the transform parameters and use<br>
>>> vtkTransform::Scale, ::RotateZ() and ::Translate() to define the<br>
>>> transformation. Then I pass this transformation to my camera by<br>
>>> vtkCamera::SetUserTransform(). After that, I do the visualization pipeline<br>
>>> again to show the new polydata object. And the visualization pipeline is<br>
>>> capsualted as an independent function.<br>
>>><br>
>>> So far, the scale and rotate works well and the polydata changes as I<br>
>>> expected. However, as I start to translate it, it disappears! It doesn't<br>
>>> work even I put simple numbers as the input parameters.<br>
>>><br>
>>> I tried to pass the transform to my actor and use<br>
>>> vtkActor::SetUserTransform to do it. But again, the scale and rotate works<br>
>>> well and translate failed.<br>
>>><br>
>>> Can anyone give me some advice? I'll be extremely appreciate it!<br>
>>><br>
>>> Thank you very much!<br>
>>><br>
>>> Best wishes<br>
>>> Long<br>
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