Delaunay三角剖分网格隐藏对角线或

时间:2014-05-09 23:14:30

标签: c# c++ vtk

鉴于对有线表示中的网格进行了delaunay三角测量,我会这样做 喜欢在没有对角线的情况下展示表面,我只是想象一个整洁的正方形。 有没有选择来完成这个,也许是一个过滤器?

类似

delaunay->BoundingTriangulationOff(); 
delaunay->SetBoundingTriangulation(0); 

但是这可以应用于所有对角线......

其他想法可能是将所有三角形转换为正方形,你知道c ++或c#中的n算法吗?

我使用了示例here

enter image description here

#include <vtkVersion.h>
#include <vtkCellArray.h>
#include <vtkPoints.h>
#include <vtkTriangle.h>
#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkLine.h>
#include <vtkCellLocator.h>
#include <vtkSmartPointer.h>
#include <vtkDelaunay2D.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProperty.h>
#include <vtkVertexGlyphFilter.h>

int main(int, char *[]) 
{ 
  // Create a set of heighs on a grid. 
  // This is often called a "terrain map". 
  vtkSmartPointer<vtkPoints> points = 
    vtkSmartPointer<vtkPoints>::New(); 

  unsigned int GridSize = 10; 
  for(unsigned int x = 0; x < GridSize; x++) 
    { 
    for(unsigned int y = 0; y < GridSize; y++) 
      { 
        points->InsertNextPoint(x, y, (x+y)/(y+1)); 
      } 
    } 

  // Add the grid points to a polydata object 
  vtkSmartPointer<vtkPolyData> polydata = 
    vtkSmartPointer<vtkPolyData>::New(); 
  polydata->SetPoints(points); 

  // Triangulate the grid points 
  vtkSmartPointer<vtkDelaunay2D> delaunay = 
  vtkSmartPointer<vtkDelaunay2D>::New(); 
#if VTK_MAJOR_VERSION <= 5 
  delaunay->SetInput(polydata); 
#else 
  delaunay->SetInputData(polydata); 
#endif 
  delaunay->Update(); 

  // Visualize 
  vtkSmartPointer<vtkPolyDataMapper> meshMapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New(); 
  meshMapper->SetInputConnection(delaunay->GetOutputPort()); 

  vtkSmartPointer<vtkActor> meshActor = 
    vtkSmartPointer<vtkActor>::New(); 
  meshActor->SetMapper(meshMapper); 

  vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter = 
    vtkSmartPointer<vtkVertexGlyphFilter>::New(); 
#if VTK_MAJOR_VERSION <= 5 
  glyphFilter->SetInputConnection(polydata->GetProducerPort()); 
#else 
  glyphFilter->SetInputData(polydata); 
#endif 
  glyphFilter->Update(); 

  vtkSmartPointer<vtkPolyDataMapper> pointMapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New(); 
  pointMapper->SetInputConnection(glyphFilter->GetOutputPort()); 

  vtkSmartPointer<vtkActor> pointActor = 
    vtkSmartPointer<vtkActor>::New(); 
  pointActor->GetProperty()->SetColor(1,0,0); 
  pointActor->GetProperty()->SetPointSize(3); 
  pointActor->SetMapper(pointMapper); 

  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New(); 
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New(); 
  renderWindow->AddRenderer(renderer); 
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New(); 
  renderWindowInteractor->SetRenderWindow(renderWindow); 

  renderer->AddActor(meshActor); 
  renderer->AddActor(pointActor); 
  renderer->SetBackground(.3, .6, .3); // Background color green 

  renderWindow->Render(); 
  renderWindowInteractor->Start(); 

  return EXIT_SUCCESS; 
}

1 个答案:

答案 0 :(得分:1)

我已经从C#中的点找了三角形Tesselation而没有找到任何东西。当我到几个月后必须使用它时,我希望我必须实现自己的。与此同时,关于Delauney Tesselations的维基百科文章有点密集(难以理解),但它是我能找到的最好的起点(用于自己动手)。

在执行tesselation(我没有帮助过你)后,你应该将模型三角形变成三角形对象,这些对象是WPF的Viewport3D的MeshGeometry3D对象。这将隐藏更近的三角形覆盖的更多三角形。 Charles Petzold的书“3D Programming for Windows”帮助了我很多。但对我来说最有帮助的是Dario Solera的“WPF 3D Primer”http://www.codeproject.com/Articles/23332/WPF-3D-Primer我所做的一切都是为了得到一个相当不错的应用程序,从Solera的代码开始,一步一步修改它,直到我有一些与他的非常不同的东西项目,但没有他的项目,我无法做到。