原文链接：https://blog.csdn.net/qq_37996632/article/details/106044996
#include <vtkActor.h> #include <vtkFloatArray.h> #include <vtkLookupTable.h> #include <vtkPointData.h> #include <vtkPolyData.h> #include <vtkPolyDataMapper.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkSmartPointer.h> #include <vtkSTLReader.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkAutoInit.h> VTK_MODULE_INIT(vtkRenderingOpenGL2); VTK_MODULE_INIT(vtkInteractionStyle); VTK_MODULE_INIT(vtkRenderingVolumeOpenGL2); VTK_MODULE_INIT(vtkRenderingFreeType); int main(int, char* []) { // 加载一个J20的STL模型 vtkSmartPointer<vtkSTLReader> source = vtkSmartPointer<vtkSTLReader>::New(); source->SetFileName("../data/tmp.stl"); source->Update(); int numPts = source->GetOutput()->GetPoints()->GetNumberOfPoints(); // 获取模型的顶点数量 vtkSmartPointer<vtkFloatArray> scalars = vtkSmartPointer<vtkFloatArray>::New(); // 创建存储顶点属性的float数组 scalars->SetNumberOfValues(numPts); for (int i = 0; i < numPts; ++i) // 为属性数组中的每个元素设置标量值（这个标量值可以当作颜色值） scalars->SetValue(i, i);这个地方点和标量产生联系(第一个参数是第几个点；第二个参数就是设定的标量值)现在就假设第i个点颜色就是i vtkSmartPointer<vtkPolyData> poly = vtkSmartPointer<vtkPolyData>::New(); poly->DeepCopy(source->GetOutput()); poly->GetPointData()->SetScalars(scalars); // 创建颜色查找表 vtkSmartPointer<vtkLookupTable> hueLut = vtkSmartPointer<vtkLookupTable>::New(); hueLut->SetNumberOfColors(numPts); // 指定颜色查找表中有多少种颜色 hueLut->SetHueRange(0.6667, 0.0); //蓝到红渐变 hueLut->Build(); vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputData(poly); mapper->SetScalarRange(0, numPts); // 设置标量值的范围（0-100） mapper->ScalarVisibilityOn(); //mapper->SetColorModeToMapScalars(); // 无论变量数据是何种类型，该方法都通过查询表对标量数据进行映射 mapper->SetColorModeToDefault(); // 默认的映射器行为，即把unsigned char类型的标量属性数据当作颜色值，不执行隐式。对于其他类型的标量数据，将通过查询表映射。 mapper->SetLookupTable(hueLut); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->GradientBackgroundOn(); renderer->SetBackground(1, 1, 1); renderer->SetBackground2(1, 1, 1); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); vtkSmartPointer<vtkInteractorStyleTrackballCamera> style = vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New(); renderWindowInteractor->SetInteractorStyle(style); renderer->AddActor(actor); renderWindow->SetSize(600, 600); renderWindow->Render(); renderWindowInteractor->Start(); return 0; }为vtkPolyData的点数据和单元数据分别指定属性数据：https://blog.csdn.net/kateyabc/article/details/84430985
