mKeyName
String = "" The name of the value. Letter case does not matter.
A float driver that returns a named float stored on a map
prop. Each map prop carries a small table of named values, and the driver returns the
one stored under mKeyName.
The source must be a map prop. The driver returns 0 without one, and when the prop
has no value under that name.
FlickerValue, BubbleSpeed, FadeValue and EmissiveStrength into material parameters.String = "" The name of the value. Letter case does not matter.