VTK vtkpolydata圖形着色

顏色可以直接作為一種標量屬性數據，設置到相應的點或者單元數據中，這是最直接的一種圖形着色方式。

1.需求

根據vtkLookupTable為點設置相對應的顏色，在這里我們需要首先為點設置標量屬性值。

2.代碼

#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkFloatArray.h>
#include <vtkCellData.h>
#include <vtkLookupTable.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>

int main(){ 14 
    vtkSmartPointer<vtkPoints> pts = vtkSmartPointer<vtkPoints>::New(); 16 
    pts->InsertNextPoint(0.0, 0.0, 0.0); 18     pts->InsertNextPoint(1.0, 0.0, 0.0); 19     pts->InsertNextPoint(1.0, 1.0, 0.0); 20     pts->InsertNextPoint(0.0, 1.0, 0.0); 21     pts->InsertNextPoint(2.0, 0.0, 0.0); 22 
    vtkSmartPointer<vtkCellArray> vertices = vtkSmartPointer<vtkCellArray>::New(); 24 
    for (int i = 0; i < 5; i++) { 26         vtkIdType pt[1] = { i }; 27         vertices->InsertNextCell(1, pt); 28  } 29 
    vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New(); 31     polyData->SetPoints(pts); 32     polyData->SetVerts(vertices); 33 
    //標量屬性
    vtkSmartPointer<vtkFloatArray> cellScalars = vtkSmartPointer<vtkFloatArray>::New(); 36 
    for (int i = 0; i < 9; i++) { 38         cellScalars->InsertNextValue(i + 1); //九個索引
 } 40 
    polyData->GetCellData()->SetScalars(cellScalars); 42 
    vtkSmartPointer<vtkLookupTable> lut = vtkSmartPointer<vtkLookupTable>::New(); 44     lut->SetNumberOfTableValues(10); 45     lut->Build(); 46     lut->SetTableValue(0, 0, 0, 0, 1); 47     lut->SetTableValue(1, 0.8900, 0.8100, 0.3400, 1); 48     lut->SetTableValue(2, 1.0000, 0.3882, 0.2784, 1); 49     lut->SetTableValue(3, 0.9608, 0.8706, 0.7020, 1); 50     lut->SetTableValue(4, 0.9020, 0.9020, 0.9804, 1); 51     lut->SetTableValue(5, 1.0000, 0.4900, 0.2500, 1); 52 
    vtkSmartPointer<vtkPolyDataMapper> mapper =vtkSmartPointer<vtkPolyDataMapper>::New(); 54     mapper->SetInputData(polyData); 55     mapper->SetScalarRange(0, 5); 56     mapper->SetLookupTable(lut); 57 
    vtkSmartPointer<vtkActor> actor =vtkSmartPointer<vtkActor>::New(); 59     actor->SetMapper(mapper); 60     actor->GetProperty()->SetPointSize(3); 61 
    vtkSmartPointer<vtkRenderer> render =vtkSmartPointer<vtkRenderer>::New(); 63     render->AddActor(actor); 64     render->SetBackground(0.0, 0.0, 0.0); 65 
    vtkSmartPointer<vtkRenderWindow> rw =vtkSmartPointer<vtkRenderWindow>::New(); 67     rw->AddRenderer(render); 68     rw->SetSize(320, 320); 69 
    vtkSmartPointer<vtkRenderWindowInteractor> rwi = vtkSmartPointer<vtkRenderWindowInteractor>::New(); 71     rwi->SetRenderWindow(rw); 72     rwi->Start(); 73 
    return 0; 75 }

3.結果

如果什么也沒有顯示可以用鼠標滾輪進行縮放一下