Set viewport background color

I resizie my graphics window after the game starts as follows:

scene_ = new Scene(context_);
Graphics* graph = GetSubsystem<Graphics>();
graph->SetMode(1280, 800, false, true, false, false, false, false, 1, 1, 1);
// set the viewport dimensions and position
graph->SetMode(width, height);
scene_ = new Scene(context_);

My problem is that this “padding” has a light gray color. How do I change this color to black?

You are calling Graphics::SetMode twice, the second call is not necessary.
Also, check the log for a line that says something like:
Set screen mode 1280x720 windowed monitor 0 resizable

Hi, capelenglish,

You can use following code to set the background color (clear color)

GetSubsystem<Renderer>()->GetDefaultZone()->SetFogColor(Color(0.0f, 0.0f, 0.0f));

and you can also add an extra Zone and set the colors.

When setting fog colour on a zone, don’t forget to also set the ambient colour, which basically provides a minimum colour (and intensity) for ambient lighting, ie, how rendered surfaces will appear, in the absence of any lighting.

            zone->SetAmbientColor(Color(0.25f, 0.25f, 0.25f));
            zone->SetFogColor(Color(0.5f, 0.5f, 0.7f));

I guess my question wasn’t very clear. By background, I meant the viewport background. I’m displaying my game using a projector with a resolution of 1280x800, but I only wanted to use 800x780 of the display. I was able to solve my problem by setting the enigne parameters:

engineParameters_[EP_WINDOW_WIDTH] = width;
engineParameters_[EP_WINDOW_HEIGHT]= height;    
engineParameters_[EP_WINDOW_POSITION_X]= left;
engineParameters_[EP_WINDOW_POSITION_Y]= top;

Thanks for responding. If you are wondering why I would want to do this, it’s a long and convoluted story related to a work project.