z buffer

(redirected from Hidden surface removal)
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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 ?
This single-slot PCI card delivers very high frame rates for truly immersive game play and serves up fantastic 3D realism through support of perspective-correct anti-aliased texture mapping, pixel-perfect hidden surface removal, translucency, real time shadows and smooth shading.
Examples ther PowerVR Ready titles not in the Extreme or p hidden surface removal with a unique method screen resolutions by combining the on-chip 3 ASICs, microprocessors and microcontrollers, 3Dited States (a).
RenderGL uses the 3D capabilities of OpenGL graphics accelerators to handle rendering algorithms such as hidden surface removal, Z-buffering, shadow calculations and polygon coordinate calculation -- tasks which normally would be handled by the main system processor.
NEC and VideoLogic have dramatically reduced memory bandwidth requirements by replacing the Z-buffer memory and associated bandwidth with on-chip hidden surface removal.
The key to this cost reduction and effective AGP use is the PowerVR's on-chip hidden surface removal and deferred texturing, which require a fraction of the memory bandwidth needed by conventional 3D systems.