Made canvas.update() update the background color of the canvas

Author: Sam Fries

Packages/vcs/Lib/VTKPlots.py

@@ -228,6 +228,10 @@ def clear(self):
             ren.RemoveAllViewProps()
             if not ren.GetLayer()==0:
               self.renWin.RemoveRenderer(ren)
+            else:
+              #Update background color
+              r,g,b = [c / 255. for c in self.canvas.backgroundcolor]
+              ren.SetBackground(r,g,b)
         ren = renderers.GetNextItem()
     if hasValidRenderer and self.renWin.IsDrawable():
         self.renWin.Render()