public static RenderScene Merge(RenderScene a, RenderScene b)
{
if (a == null && b == null)
{
return(RenderScene.Empty);
}
if (a == null || a.Count <= 0)
{
return(b);
}
if (b == null || b.Count <= 0)
{
return(a);
}
var collection = new RenderObjectCollection(a.Count + b.Count);
a.CopyTo(collection, 0);
b.CopyTo(collection, a.Count);
return(collection);
}