VTK: setting transparent renderer background
<p>I am allowed to define the backgroundColor of a renderer by calling </p>

<pre><code>renderer = vtk.vtkRenderer()
renderer.SetBackground(0,255,0)
</code></pre>

<p>[![enter image description here][1]][1]</p>

<p>My question:</p>

<p>Is it possible to set the opacity of the background ? </p>

<p>You can see my problem (with multiple viewports) in my example image. I could get rid of this "cutting" by simply using transparent backgrounds...</p>

<p>thanks in advance! </p>