-# namespace, constants and util functions
+# namespace, constants and utility functions
 
+# namespace `Bu` is also a shortcut to class `Bu.Renderer`
 @Bu = () -> new Bu.Renderer arguments...
 
 



###
# math
###

# calculate the mean value of several numbers

		to = from
		from = 0
	Math.random() * (to - from) + from

# get current time
Bu.now = if window?.performance? then -> window.performance.now() else -> Date.now()
