ATI Technologies RADEON 8500 MAC EDITION User's Guide download pdf (Page 30)

Pixel, Pel Picture element. Smallest addressable area of the

computer screen. Pixels on computer displays are

square; pixels on NTSC televisions have a 4:3 aspect

ratio.

Refresh Rate Also referred to as “vertical refresh rate”. The rate at

which a monitor or television can redraw the screen

from top to bottom. NTSC television systems have a

refresh rate of approximately 60 Hz (but only draw one-

half of the video frame in one pass); computer displays

typically have refresh rates of 75 Hz or more. At a

refresh rate of 70 Hz and lower, screen flicker is often

noticeable.

SMARTSHADER

™

2.1

An advanced programmable pixel and vertex shader

technology which delivers complex and realistic

textures and lighting without slowing performance.

SMOOTHVISION

™

2.1

Full Screen Anti-Aliasing technology designed to

minimize jagged edges resulting in smooth images.

Specular Highlight The bright, usually small, intense light reflected from a

3-D surface with a high refraction value.

Texture Mapping Mapping, or placing, an image onto an object. Images of

realistic surfaces are placed on 3D models to create a

richer and more complex visual effect.

Trilinear Filtering Sampling method used to produce the most realistic

looking 3D objects. Trilinear filtering averages one of

the bilinear filter MIP Map levels along with the

standard MIP Map samples.

VERSAVISION

™

ATI’s hardware accelerated display rotation and scaling

technology. Any desktop can now be rotated 90 degrees

left or right, or even 180 degrees, while maintaining the

full feature set of other ATI 2D and 3D technologies,

such as SMOOTHVISION. VERSAVISION works

with single or multiple displays.

Z-buffer A z-buffer is an area of off-screen memory used to hold

“depth” information. For each dot, or pixel, in the

display buffer, there is a corresponding dot in the

z-buffer which holds the depth (z) value for the display

pixel. The depth data helps the ATI accelerator card

decide what 3D objects are in front of other 3D objects.

The larger the 3D window, the larger the z-buffer is in

memory.

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