App.Background is the group for the variables related to the background sky in Phun.

List of variables:

Variable name	Variable type	Description	Default (Phun beta 4.20)
cloudOpacity	positive decimal value	The opacity of the clouds	0.9
drawClouds	true or false	if clouds should be drawn	true
skyColor	four positive decimal values	The RGBA color code for the sky color.	[0.3, 0.4, 1.0, 1.0]