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# Cone4

VTKEx/Python/Rendering/Cone4

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### Code

Cone4.py

    #!/usr/bin/env python
    # -*- coding: utf-8 -*-

    import time

    import vtk

    def main():
        colors = vtk.vtkNamedColors()

        #
        # Next we create an instance of vtkConeSource and set some of its
        # properties. The instance of vtkConeSource "cone" is part of a visualization
        # pipeline (it is a source process object); it produces data (output type is
        # vtkPolyData) which other filters may process.
        #
        cone = vtk.vtkConeSource()
        cone.SetHeight(3.0)
        cone.SetRadius(1.0)
        cone.SetResolution(10)

        #
        # In this example we terminate the pipeline with a mapper process object.
        # (Intermediate filters such as vtkShrinkPolyData could be inserted in
        # between the source and the mapper.)  We create an instance of
        # vtkPolyDataMapper to map the polygonal data into graphics primitives. We
        # connect the output of the cone source to the input of this mapper.
        #
        coneMapper = vtk.vtkPolyDataMapper()
        coneMapper.SetInputConnection(cone.GetOutputPort())

        #
        # Create an actor to represent the first cone. The actor's properties are
        # modified to give it different surface properties. By default, an actor
        # is create with a property so the GetProperty() method can be used.
        #
        coneActor = vtk.vtkActor()
        coneActor.SetMapper(coneMapper)
        coneActor.GetProperty().SetColor(colors.GetColor3d("Peacock"))
        coneActor.GetProperty().SetDiffuse(0.7)
        coneActor.GetProperty().SetSpecular(0.4)
        coneActor.GetProperty().SetSpecularPower(20)

        #
        # Create a property and directly manipulate it. Assign it to the
        # second actor.
        #
        property = vtk.vtkProperty()
        property.SetColor(colors.GetColor3d("Tomato"))
        property.SetDiffuse(0.7)
        property.SetSpecular(0.4)
        property.SetSpecularPower(20)

        #
        # Create a second actor and a property. The property is directly
        # manipulated and then assigned to the actor. In this way, a single
        # property can be shared among many actors. Note also that we use the
        # same mapper as the first actor did. This way we avoid duplicating
        # geometry, which may save lots of memory if the geometry is large.
        coneActor2 = vtk.vtkActor()
        coneActor2.SetMapper(coneMapper)
        # coneActor2.GetProperty().SetColor(colors.GetColor3d("Peacock"))
        coneActor2.SetProperty(property)
        coneActor2.SetPosition(0, 2, 0)

        #
        # Create the Renderer and assign actors to it. A renderer is like a
        # viewport. It is part or all of a window on the screen and it is responsible
        # for drawing the actors it has.  We also set the background color here.
        #
        ren1 = vtk.vtkRenderer()
        ren1.AddActor(coneActor)
        ren1.AddActor(coneActor2)
        ren1.SetBackground(colors.GetColor3d("LightSlateGray"))

        #
        # Finally we create the render window which will show up on the screen
        # We put our renderer into the render window using AddRenderer. We also
        # set the size to be 300 pixels by 300.
        #
        renWin = vtk.vtkRenderWindow()
        renWin.AddRenderer(ren1)
        renWin.SetSize(640, 480)

        iren = vtk.vtkRenderWindowInteractor()
        iren.SetRenderWindow(renWin)

        #
        # Now we loop over 60 degrees and render the cone each time.
        #
        ren1.GetActiveCamera().Elevation(30)
        ren1.ResetCamera()
        for i in range(0, 60):
            time.sleep(0.03)

            renWin.Render()
            ren1.GetActiveCamera().Azimuth(1)

        iren.Start()

    if __name__ == "__main__":
        main()