This is the final result for the green screen.
This will create the green screen and also two vertical black bars aligned to left and right to make you have a squared view instead of fullscreen (rectangular) view.
Tested on 1366x768 and 640x480, but not on 1920x1020 (although it should work).
The only thing is, I set sort to 0 but the black bars are still over the clock.
PHP Code:
cameraScreen()
{
if(isdefined(self.hud_green))
self.hud_green destroy();
self.hud_green = newClientHudElem(self);
self.hud_green.vertAlign = "fullscreen";
self.hud_green.horzAlign = "fullscreen";
self.hud_green.alpha = 0.4;
self.hud_green setShader("white", 640, 480);
self.hud_green.color = (0,0.5,0);
self.hud_green.sort = 0;
if(isdefined(self.hud_black1))
self.hud_black1 destroy();
self.hud_black1 = newClientHudElem(self);
self.hud_black1.vertAlign = "fullscreen";
self.hud_black1.horzAlign = "center";
self.hud_black1.x = -492;
self.hud_black1.alpha = 1;
self.hud_black1 setShader("white", 180, 480);
self.hud_black1.color = (0,0,0);
self.hud_black1.sort = 0;
if(isdefined(self.hud_black2))
self.hud_black1 destroy();
self.hud_black2 = newClientHudElem(self);
self.hud_black2.vertAlign = "fullscreen";
self.hud_black2.horzAlign = "center";
self.hud_black2.x = 312;
self.hud_black2.alpha = 1;
self.hud_black2 setShader("white", 180, 480);
self.hud_black2.color = (0,0,0);
self.hud_black2.sort = 0;
}