颜色可以直接作为一种标量属性数据，设置到相应的点或者单元数据中，这是最直接的一种图形着色方式。
1.需求
根据vtkLookupTable为点设置相对应的颜色，在这里我们需要首先为点设置标量属性值。
2.代码
1 #include <vtkSmartPointer.h>
2 #include <vtkPolyData.h>
3 #include <vtkFloatArray.h>
4 #include <vtkCellData.h>
5 #include <vtkLookupTable.h>
6 #include <vtkPolyDataMapper.h>
7 #include <vtkActor.h>
8 #include <vtkProperty.h>
9 #include <vtkRenderer.h>
10 #include <vtkRenderWindow.h>
11 #include <vtkRenderWindowInteractor.h>
12
13 int main(){
14
15 vtkSmartPointer<vtkPoints> pts = vtkSmartPointer<vtkPoints>::New();
16
17 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
23 vtkSmartPointer<vtkCellArray> vertices = vtkSmartPointer<vtkCellArray>::New();
24
25 for (int i = 0; i < 5; i++) {
26 vtkIdType pt[1] = { i };
27 vertices->InsertNextCell(1, pt);
28 }
29
30 vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
31 polyData->SetPoints(pts);
32 polyData->SetVerts(vertices);
33
34 //标量属性
35 vtkSmartPointer<vtkFloatArray> cellScalars = vtkSmartPointer<vtkFloatArray>::New();
36
37 for (int i = 0; i < 9; i++) {
38 cellScalars->InsertNextValue(i + 1); //九个索引
39 }
40
41 polyData->GetCellData()->SetScalars(cellScalars);
42
43 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
53 vtkSmartPointer<vtkPolyDataMapper> mapper =vtkSmartPointer<vtkPolyDataMapper>::New();
54 mapper->SetInputData(polyData);
55 mapper->SetScalarRange(0, 5);
56 mapper->SetLookupTable(lut);
57
58 vtkSmartPointer<vtkActor> actor =vtkSmartPointer<vtkActor>::New();
59 actor->SetMapper(mapper);
60 actor->GetProperty()->SetPointSize(3);
61
62 vtkSmartPointer<vtkRenderer> render =vtkSmartPointer<vtkRenderer>::New();
63 render->AddActor(actor);
64 render->SetBackground(0.0, 0.0, 0.0);
65
66 vtkSmartPointer<vtkRenderWindow> rw =vtkSmartPointer<vtkRenderWindow>::New();
67 rw->AddRenderer(render);
68 rw->SetSize(320, 320);
69
70 vtkSmartPointer<vtkRenderWindowInteractor> rwi = vtkSmartPointer<vtkRenderWindowInteractor>::New();
71 rwi->SetRenderWindow(rw);
72 rwi->Start();
73
74 return 0;
75 }
3.结果
如果什么也没有显示可以用鼠标滚轮进行缩放一下
