If I want to draw something in the client area of the window OSG is
rendering into (via Windows GDI calls), would I do this in a
preDrawCallback? (after setting an appropriate ClearMask in the camera)

I want to have a gradient background and I'm thinking that I could do
this easily with the GradientFill() function. I realize I could
accomplish the same thing using methods from the osgHud example, but I'm
thinking that a GDI call would be faster.

Cory
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