The alpha channel range [0-1]. 1 is fully opaque.
The blue channel range [0-1].
The green channel range [0-1].
The red channel range [0-1].
StaticnewInstantiates a new Colour4.
Optionalr: numberthe red-channel value, range [0-1]
Optionalg: numberthe green-channel value, range [0-1]
Optionalb: numberthe blue-channel value, range [0-1]
Optionala: numberthe alpha-channel value, range [0-1].
The newly instantiated Colour4.
Represents a colour in RGBA format, with each colour channel in the range of [0-1].