# Overlay colors for cut planes

**URL:** https://discourse.vtk.org/t/overlay-colors-for-cut-planes/7732
**Category:** Support
**Tags:** jobs, proposal
**Created:** [January 28, 2022, 9:38am UTC](https://discourse.vtk.org/t/overlay-colors-for-cut-planes/7732 "2022-01-28T09:38:33Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![wulicheng](https://discourse.vtk.org/user_avatar/discourse.vtk.org/wulicheng/32/1990_2.png) [@wulicheng](https://discourse.vtk.org/u/wulicheng)
#### Post date: [January 28, 2022, 9:38am UTC](https://discourse.vtk.org/t/overlay-colors-for-cut-planes/7732/1 "2022-01-28T09:38:33Z")

</div>

Here is the code：

```auto
onDisplayColorMprPixel(vtkImageViewer2* imageViewer, vtkImagePlaneWidget* imagePlane,int slicerIndex)
{
 
	vtkSmartPointer<vtkImageViewer2> viewerLayer = vtkSmartPointer<vtkImageViewer2>::New();
	
	//viewerLayer->SetRenderWindow(imageViewer->GetRenderWindow());//After adding this sentence, there will be no superposition effect
	viewerLayer->SetInputData(m_pHessianImageData);
	
	if (m_nIndex == 1)
		viewerLayer->SetSliceOrientationToXY();
	else if (m_nIndex == 2)
		viewerLayer->SetSliceOrientationToYZ();
	else if (m_nIndex == 3)
		viewerLayer->SetSliceOrientationToXZ();
	viewerLayer->GetRenderWindow()->SetShowWindow(false);
	viewerLayer->SetSlice(slicerIndex);//到此出为止会出现弹窗
	viewerLayer->GetImageActor()->SetInterpolate(false);
	viewerLayer->GetImageActor()->GetProperty()->SetLookupTable(pColorTable);
	viewerLayer->GetImageActor()->SetOpacity(0.5); 
	viewerLayer->GetImageActor()->GetProperty()->SetDiffuse(0.0);
	viewerLayer->GetImageActor()->SetPickable(false);
	vtkImageActor* actor = viewerLayer->GetImageActor();
	vtkRenderer* renderer = imageViewer->GetRenderer();
	renderer->AddActor(actor);
	renderer->AddActor(imageViewer->GetImageActor());
	vtkRenderWindow* rw = imageViewer->GetRenderWindow();
	rw->AddRenderer(renderer);
	rw->Render();
 
 
}

'''''''''''''
ImageViewer is the view that originally displays slices, 
and viewerlayer is the view overlaying on the original section. 
Slicerindex is the section number, and pcolortable is the color table. 

```

Effect:  
 ![image](https://discourse.vtk.org/uploads/default/original/2X/d/d7702d8f85eca906e5516542fcce21aceacfb8cf.png)

```auto

Problem: a new window will always be created and flashed.
 If you release the comments above, a new window will not appear, 
but there is no overlaying effect. Only the red label is displayed.
 I don't know what suggestions you have. 
After reading some things on the Internet, it's still different.
 I keep scrolling and displaying each slice.
 And display the superposition effect. Red and white.

How to resloved this problem?
```