z buffer

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z buffer

A memory buffer in a graphics accelerator that is used to speed up the rendering of 3D images. It holds the depth of each pixel (z-axis), and as an image is drawn, each pixel is matched against the z buffer location. If the next pixel in line to be drawn is below the one that is already there, it is ignored. This is also known as "hidden surface removal." See graphics pipeline and graphics accelerator.
References in periodicals archive ?
A key problem with traditional 3D architectures that have evolved from the PC marketplace is that increasing performance levels have required ever-larger memories and ever-higher memory bandwidth to manage texturing and Z-buffering.
16 MB dedicated, hardware-accelerated texture mapping memory: improves on-screen design quality and provides high-performance hardware-based texture mapping operations for fast visual feedback; helps ensure that there are no trade-offs between display resolutions, texture memory, and z-buffering depth.
GXP gives 3D solid modeling, full shading, Z-buffering, double-buffering and 24-bit planes.
16 MB frame buffer: Enables hardware-accelerated alpha-blending, fogging, z-buffering, and other realism-enhancing operations.
In addition to image quality and performance, AAlchemy's support for key simulation features including SwapLock(TM) precision multi-channel synchronization, floating point Z-buffering for improved moving model resolution, along with the ease of development provided by OpenGVS were essential elements in Quantum3D's selection by Indra.
Incorporating powerful 2D and 3D rendering engines, cached local texture memory, and on-chip DMA, VGA and setup, the REALimage 2000 architecture supports any combination of robust graphics features (lighting, Z-buffering, alpha blending, window clipping, etc.
This unparalleled level of delivered performance and image fidelity, coupled with AAlchemy's support for key simulation features including SwapLock(TM) precision multi-channel synchronization, floating point Z-buffering for improved target resolution and a digital pixel port for sensor and other post-processing capabilities, enable AAlchemy to meet the stringent fidelity and performance requirements levied by Lockheed Martin for the UK CATT program.
The pairing of the two technologies will leverage the unique features of the RAGE 128 card such as its power to handle advanced visual effects including, superscalar rendering, line and edge anti-aliasing, gouraud shading, twin cache, single pass multitexturing, perspectively correct texture mapping, mip-mapping and z-buffering and double buffering," said Ed Grondahl, Vice President of Product Marketing of ATI.
0 environments offering a complete 3D features set with alpha-blending, anti-aliasing, Z-buffering, Gouraud shading, hardware triangle set up and more, for smoother more defined visuals.
Other features include transparency for enabling realistic rendering of glass, water and plastic objects; atmospheric effects such as fog and depth cueing to enable rendering of real-world environments; and Z-buffering to speed the removal of hidden surfaces for improved performance and visual quality.
The Diamond Fire GL 5000 supports key 3D graphics features, including lighting, Z-buffering and alpha blending, without compromising performance or image quality and is scaleable as CPU performance increases.
In addition, Diamond's Stealth II G460 features a robust set of 3D functions, including bilinear and trilinear filtering, MIP mapping, edge anti-aliasing, flat and Gouraud shading, perspective correction and Z-buffering for extraordinarily rich, detailed 3D imaging.