[vtkusers] How to get opengl texture id from vtkImagePlaneWidget

[LaChen]

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().





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