Feature: 	OpenGL 	DirectX
Vertex Blending 	N/A 	Yes
Multiple Operating Systems 	Yes 	No
Extension Mechanism 	Yes 	Yes
Development 	Multiple member Board 	Microsoft
Thorough Specification 	Yes 	No
Two-sided lighting 	Yes 	No
Volume Textures 	Yes 	No
Hardware independent Z-buffers 	Yes 	No
Accumulation buffers 	Yes 	No
Full-screen Antialiasing 	Yes 	Yes
Motion Blur 	Yes 	Yes
Depth of field 	Yes 	Yes
Stereo Rendering 	Yes 	No
Point-size/line-width attributes 	Yes 	No
Picking 	Yes 	No
Parametric curves and surfaces 	Yes 	No
Cache geometry 	Display Lists 	Vertex Buffers
System emulation 	Hardware not present 	Let app determine
Interface 	Procedure calls 	COM
Updates 	Yearly 	Yearly
Source Code 	Sample 	SDK Implementation