how to add an image to render window which had point cloud already

Support
1

I write following function to add an image to a rendered window which contained point cloud, it failed

void addImageToview(vtkRenderWindowInteractor* interactor,  vtkSmartPointer<vtkRenderWindow> renderWindow, const std::string &imagePath, double &x, double &y, double &x_wide, double &y_wide, double &opaticy)
{
	   vtkSmartPointer<vtkJPEGReader> reader = vtkSmartPointer<vtkJPEGReader>::New();
	   reader->SetFileName(imagePath.c_str());/*no multiple coding format*/
	  reader->Update();

	   vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
        //vtkSmartPointer<vtkRenderWindow> renderWindow = 
        vtkSmartPointer<vtkRenderWindow>::New();  //** comment out this line, the passed  renderWindow will be erased.
        renderWindow->AddRenderer(renderer);  

        // Create a vtkImageActor to display the image
        vtkSmartPointer<vtkImageActor> imageActor = vtkSmartPointer<vtkImageActor>::New();
        imageActor->SetInputData(reader->GetOutput());
	    imageActor->SetPosition(x, y,0);

        // Add the image actor to the renderer as an overlay
        renderer->AddActor2D(imageActor); // AddActor2D adds the actor as an overlay, keeping existing actors intact
		
}

where, vtkRenderWindowInteractor* interactor, vtkSmartPointer renderWindow contained point cloud,see blow

vtk_lidar
vtk_lidar992×729 40 KB

if I comment out this line marked by **, the passed renderWindow of function parameter will be erased. only the image showed,

VTK_IMG
VTK_IMG1832×938 123 KB

I want to show both an image on the point cloud(put the image at given postion of the screen), like below,

LC

how to implemented this function?

2

Hello,

Why are you trying to create another vtkRenderWindow inside the function? Aren’t you supposed to use the one passed as argument?

best,

PC

3

I want to use the passed renderWindow as argument. my winodow is

  renderWindow = vtkSmartPointer<vtkGenericOpenGLRenderWindow>::New();
  renderWindow->AddRenderer(renderer_lidar);

when I try to add a image view,such as
renderWindow->AddRenderer(renderer_image);
than renderer_lidar is erased by renderer_image

If I addd an image(via vtkImageActor) to renderer_lidar, it is ok, adding to main window failed

4

So don’t create one inside the function. Just remove New() call from inside addImageToview().

5

That’s the point here, when I add addImageToview(), the previous point cloud is erased by image, I want show them simutaneously, and image not ratoated with pointcloud