[vtkusers] Adding two lightsources to a renderer

[Bill Lorensen]

Ken,

Can you send me the code? I'll make a VTKExample...

On Thu, Sep 7, 2017 at 12:27 PM, Ken Martin <ken.martin at kitware.com> wrote:

> I just tested this and it seems to work on master. This is the image I
> get. Maybe this is an issue that has been fixed since 8.0 was cut?
>
>
>
> [image: Inline image 1]
>
> On Wed, Sep 6, 2017 at 2:17 PM, Oliver Natt <onatt at gmx.de> wrote:
>
>> Dear vtkusers,
>>
>> I encountered a weird problem when using more than one positional light
>> source in vtk. I am pretty sure that it worked with vtk 7.1 but it stopped
>> working with vtk 8.0.0 and 8.0.1. An example in python is given below. The
>> scene contains a plane which should be illuminated by two spot lights.
>> However, only one spotlight is rendered. It seems that this is always the
>> first spotlight that is added to the renderer. Is there any workaround for
>> this problem?
>>
>> Many thanks
>> Oliver
>>
>>
>> import vtk
>> # create a rendering window and rendererrenderer = vtk.vtkRenderer()
>> render_window = vtk.vtkRenderWindow()
>> render_window.AddRenderer(renderer)
>> # create a renderwindowinteractoriren = vtk.vtkRenderWindowInteractor()
>> iren.SetRenderWindow(render_window)
>> # create a plane and add it to the rendererrectangle_source = vtk.vtkPlaneSource()
>> rectangle_source.SetOrigin(-5.0, 0.0, 5.0)
>> rectangle_source.SetPoint1(5.0, 0.0, 5.0)
>> rectangle_source.SetPoint2(-5.0, 0.0, -5.0)
>> rectangle_source.SetResolution(100, 100)
>> mapper = vtk.vtkPolyDataMapper()
>> mapper.SetInputConnection(rectangle_source.GetOutputPort())
>> actor = vtk.vtkActor()
>> actor.SetMapper(mapper)
>> renderer.AddActor(actor)
>> # set camera viewrenderer.ResetCamera()
>> camera = renderer.GetActiveCamera()
>> camera.Azimuth(40.0)
>> camera.Elevation(30.0)
>> # create a green lightlight_green = vtk.vtkLight()
>> light_green.SetPositional(1)
>> light_green.SetPosition(-4.0, 4.0, -1.0)
>> light_green.SetColor(0.0, 1.0, 0.0)
>> light_green.SetIntensity(0.5)
>> # create a pink lighlight_pink = vtk.vtkLight()
>> light_pink.SetPositional(1)
>> light_pink.SetPosition(4.0, 5.0, 1.0)
>> light_pink.SetColor(1.0, 0.0, 1.0)
>> light_pink.SetIntensity(0.6)
>> # add lights to the renderer## This is interesting in vtk 8.0.0 and 8.0.1:# Only the pink light spot is visible. If the two statements are swapped,# only the green light is visible. It seems that always only the first# light can be active.renderer.AddLight(light_pink)
>> renderer.AddLight(light_green)
>> # define a background for better visibilityrenderer.SetBackground(0.2, 0.2, 0.5)
>> renderer.SetBackground2(0.4, 0.4, 1.0)
>> renderer.SetGradientBackground(True)
>> # enable interactoriren.Initialize()
>> render_window.Render()
>> iren.Start()
>>
>>
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>>
>
>
> --
> Ken Martin PhD
> Distinguished Engineer
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
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