QuickDraw 3D, or QD3D for short, is a 3D graphics API developed by Apple Computer starting in 1995, originally for their Macintosh computers, but delivered as a cross-platform system.
QD3D provided a high-level API with a rich set of 3D primitives that was generally much more full-featured and easier to develop than low-level APIs such as OpenGL or Direct3D. Below this was a cleanly-separated hardware abstraction layer known as RAVE that allowed the system to be ported to new hardware easily. On the downside, QD3D used a number of Apple-specific ideas about how 3D hardware should work, and initially performed poorly due to the lack of hardware acceleration.