[vtkusers] How to get opengl texture id from vtkImagePlaneWidget

[LaChen]

LaChen wrote
> Hi, I use vtkImagePlaneWidget and set an offscreen renderer as default
> renderer.
> 
> The reason I do that is I wan't to get slide image texture id by the codes
> as follow :
> 
>    vtkTextureObject *texture_obj =
> vtkOpenGLTexture::SafeDownCast(m_slider_widget[i].GetVTKImagePlaneWidgetPtr()->GetTexture())->GetTextureObject();
> 
> texture_id = texture_obj->GetHandle();
> 
> But I always get null pointer of vtkTextureObject.
> 
> I have no idea about this problem.

> 
> P.S. I try to get the handle after executing default renderer->Render().


I find the reason why I get nullptr.

I needs to use ImagePanelWidget::InteractorOn().

But I still can't get real slicing of image with index I set.

Does someone encounter same situation??



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