TriangleColoredPoints
VTKExamples/Java/PolyData/TriangleColoredPoints
Description¶
This example shows how by adding a color to each vertex of a triangle, the triangle's color will be smoothly varying between the colors of the vertices.
Question
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Code¶
TriangleColoredPoints.java
import vtk.vtkRenderWindow; import vtk.vtkActor; import vtk.vtkPoints; import vtk.vtkNativeLibrary; import vtk.vtkPolyDataMapper; import vtk.vtkRenderer; import vtk.vtkRenderWindowInteractor; import vtk.vtkPolyData; import vtk.vtkTriangle; import vtk.vtkUnsignedCharArray; import vtk.vtkCellArray; import vtk.vtkNamedColors; public class TriangleColoredPoints { //----------------------------------------------------------------- // Load VTK library and print which library was not properly loaded static { if (!vtkNativeLibrary.LoadAllNativeLibraries()) { for (vtkNativeLibrary lib : vtkNativeLibrary.values()) { if (!lib.IsLoaded()) { System.out.println(lib.GetLibraryName() + " not loaded"); } } } vtkNativeLibrary.DisableOutputWindow(null); } // ----------------------------------------------------------------- public static void main(String args[]) { vtkNamedColors colors = new vtkNamedColors(); //Renderer Background Color double Bgcolor[] = new double[4]; colors.GetColor("Black", Bgcolor); // Setup points vtkPoints Points = new vtkPoints(); Points.InsertNextPoint(0.0, 0.0, 0.0); Points.InsertNextPoint(1.0, 0.0, 0.0); Points.InsertNextPoint(0.0, 1.0, 0.0); //Setup the colors array vtkUnsignedCharArray Colors = new vtkUnsignedCharArray(); Colors.SetNumberOfComponents(3); Colors.SetName("Colors"); //Add the three colors we have created to the array Colors.InsertNextTuple3(255,0, 0); Colors.InsertNextTuple3(0, 255, 0); Colors.InsertNextTuple3(0, 0, 255); //Create a triangle vtkCellArray Triangles = new vtkCellArray(); vtkTriangle Triangle = new vtkTriangle(); Triangle.GetPointIds().SetId(0, 0); Triangle.GetPointIds().SetId(1, 1); Triangle.GetPointIds().SetId(2, 2); Triangles.InsertNextCell(Triangle); //Create a polydata object and add everything to it vtkPolyData PolyData = new vtkPolyData(); PolyData.SetPoints(Points); PolyData.SetPolys(Triangles); PolyData.GetPointData().SetScalars(Colors); vtkPolyDataMapper Mapper = new vtkPolyDataMapper(); Mapper.SetInputData(PolyData); vtkActor Actor = new vtkActor(); Actor.SetMapper(Mapper); //Create the renderer, render window and interactor. vtkRenderer ren = new vtkRenderer(); vtkRenderWindow renWin = new vtkRenderWindow(); renWin.AddRenderer(ren); vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor(); iren.SetRenderWindow(renWin); // Visualize the actor ren.AddActor(Actor); ren.SetBackground(Bgcolor); renWin.SetSize(300, 300); renWin.Render(); iren.Initialize(); iren.Start(); } }