# Change actor color after window is rendered

**URL:** https://discourse.vtk.org/t/change-actor-color-after-window-is-rendered/3437
**Category:** Support
**Created:** [June 1, 2020, 2:20pm UTC](https://discourse.vtk.org/t/change-actor-color-after-window-is-rendered/3437 "2020-06-01T14:20:30Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![efdiloreto](https://discourse.vtk.org/user_avatar/discourse.vtk.org/efdiloreto/32/2059_2.png) [@efdiloreto](https://discourse.vtk.org/u/efdiloreto)
#### Post date: [June 1, 2020, 2:20pm UTC](https://discourse.vtk.org/t/change-actor-color-after-window-is-rendered/3437/1 "2020-06-01T14:20:30Z")

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Hi everybody, I am starting with VTK and I encounter this issue. I searched for this problem but I didn’t find anything. I hope somebody can help me.

I’m trying to change the color of one of the actors. Seems like the method `SetColor(colors.GetColor3d("Silver"))` is not working.

I’m also tried with `b.GetMapper().ScalarVisibilityOff()` but doesn´t work.

```
import vtk

colors = vtk.vtkNamedColors()

def crear_superficie(*puntos):

    points = vtk.vtkPoints()
    polygon = vtk.vtkPolygon()
    polygon.GetPointIds().SetNumberOfIds(len(puntos))
    for i, p in enumerate(puntos):
        points.InsertNextPoint(*p)
        polygon.GetPointIds().SetId(i, i)
    polygons = vtk.vtkCellArray()
    polygons.InsertNextCell(polygon)

# Create a PolyData
polygonPolyData = vtk.vtkPolyData()
polygonPolyData.SetPoints(points)
polygonPolyData.SetPolys(polygons)

# Create a mapper and actor
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputData(polygonPolyData)

actor = vtk.vtkActor()
actor.SetMapper(mapper)
actor.GetProperty().EdgeVisibilityOn()
actor.GetProperty().SetLineWidth(2)
actor.GetProperty().SetColor(colors.GetColor3d("Banana"))

return actor

def main():

    a = crear_superficie((0, 0, 0), (0, 6, 0), (15, 10, 0), (30, 6, 0), (30, 0, 0))
    b = crear_superficie((0, 6, 0), (15, 10, 0), (15, 10, 60), (0, 6, 60))
   # Add the polygon to a list of polygons

    # Visualize
    renderer = vtk.vtkRenderer()
    renderWindow = vtk.vtkRenderWindow()
    renderWindow.SetWindowName("Polygon")
    renderWindow.AddRenderer(renderer)
    renderWindowInteractor = vtk.vtkRenderWindowInteractor()
    renderWindowInteractor.SetRenderWindow(renderWindow)

    renderer.AddActor(a)
    renderer.AddActor(b)
    renderer.SetBackground(colors.GetColor3d("Silver"))
    renderWindow.Render()
    renderWindowInteractor.Start()
    b.GetProperty().SetColor(colors.GetColor3d("Silver"))

if __name__ == ' __main__':
   main()
```

---

<div class="post-metadata">

### Author: ![nicolas.vuaille](https://discourse.vtk.org/user_avatar/discourse.vtk.org/nicolas.vuaille/32/5363_2.png) [@nicolas.vuaille](https://discourse.vtk.org/u/nicolas.vuaille)
#### Post date: [June 1, 2020, 3:48pm UTC](https://discourse.vtk.org/t/change-actor-color-after-window-is-rendered/3437/2 "2020-06-01T15:48:00Z")

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Already in discussion on StackOverflow.

> <https://stackoverflow.com/questions/62133656/change-actor-color-after-window-is-rendered/62135150#62135150>