[Description] Specifies an opacity component in addition to RGB color information. Alpha specifies opacity with a range that goes from completely transparent to opaque. [Feature] 
Alpha blending
T e x t u r e m a p p i n g
D o u b l e b u f f e r i n g
Z - b u f f e r i n g
G o u r a d s h a d i n g
L i g h t i n g , m a t e r i a l s
T r a n s f o r m s
A n t i - a l i a s i n g
A l p h a b l e n d i n g