VTK:可视化深度缓冲区

VTK: visualize depth buffer

本文关键字：缓冲区 深度 可视化 VTK      更新时间：2023-10-16

我试图按照这里的示例进行操作：http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/ZBuffer将zbuffer可视化。在尝试更改摄影机视点之前，此操作效果良好。

我的代码如下：除了粗体的位之外，与示例相同：

// This demo creates depth map for a polydata instance by extracting 
// exact ZBuffer values. 
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkBMPWriter.h>
#include <vtkWindowToImageFilter.h>
#include <vtkImageShiftScale.h>
int main(int argc, char *argv[]) { 
        vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); 
        vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); 
        vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); 
        vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New(); 
        vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); 
        vtkSmartPointer<vtkPLYReader> fileReader = vtkSmartPointer<vtkPLYReader>::New(); 
        vtkSmartPointer<vtkWindowToImageFilter> filter = vtkSmartPointer<vtkWindowToImageFilter>::New(); 
        vtkSmartPointer<vtkBMPWriter> imageWriter = vtkSmartPointer<vtkBMPWriter>::New(); 
        vtkSmartPointer<vtkImageShiftScale> scale = vtkSmartPointer<vtkImageShiftScale>::New(); 
        // Read .vtp file 
        fileReader->SetFileName("mesh.ply"); 
        //Build visualization enviroment 
        mapper->SetInputConnection(fileReader->GetOutputPort()); 
        actor->SetMapper(mapper); 
        renderer->AddActor(actor); 
        //change camera viewpoint 
        vtkSmartPointer<vtkCamera> camera = vtkSmartPointer<vtkCamera>::New(); 
        camera->SetPosition(0, 0, 650); 
        renderer->SetActiveCamera(camera); 

        renWin->AddRenderer(renderer); 
        interactor->SetRenderWindow(renWin); 
        renWin->Render(); 
        // Create Depth Map 
        filter->SetInput(renWin); 
        filter->SetMagnification(1); 
        filter->SetInputBufferTypeToZBuffer();        //Extract z buffer value 
        scale->SetOutputScalarTypeToUnsignedChar(); 
        scale->SetInputConnection(filter->GetOutputPort()); 
        scale->SetShift(0); 
        scale->SetScale(-255); 
        // Write depth map as a .bmp image 
        imageWriter->SetFileName("out2.bmp"); 
        imageWriter->SetInputConnection(scale->GetOutputPort()); 
        imageWriter->Write(); 
        return EXIT_SUCCESS; 
}

现在，整个深度可视化完全是黑色的。然而，在这个相机位置，网格渲染得很好，所以我不认为这是因为相机离得太远。你知道我做错了什么吗？

这可能是因为远平面靠近正在渲染的对象。尝试放置，在相机创建后，一个更好的剪辑平面，例如：

camera->SetClippingRange(640, 1000);
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