Switching draw contexts

[Edward K. C. <ek...@lg...>]

Maybe someone can answer this one for me?

I just added some printing support taking what I believed to be the  
path of least resistance.  I use the same view object for printing as  
I do for window updates.  Maybe that's a bad idea.  I temporarily  
replace the Mac draw context with a pixmap context and fiddle with  
some of the camera settings (to take into account the dimensions of  
the printed page).  Then I run through my rendering loop and shoot  
the off-screen image off to the printer.

Much to my delight, the printing itself actually worked perfectly on  
the first try.  The only strange symptom is that the window blanks  
out the moment I call Q3View_StartRendering.  I would have thought  
that since I am no longer targeting the window, nothing much would  
happen to it, so this sort of caught me by surprise.

I guess I'll just tell it to redraw itself, but I'm curious about  
what is causing this...

-Ted