Z3: An Economical Hardware Technique for High-Quality Antialiasing and Transparency (English)

In: Graphics Hardware   ;  85-94  ;  1999

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In this paper we present an algorithm for low-cost hardware antialiasing and transparency. This technique keeps a central Z value along with compact floating-point Z gradients in the X and Y dimensions for each fragment within a pixel (hence the name Z3). It uses a small fixed amount of storage per pixel. If the visible complexity of the pixel exceeds the storage space available for the pixel, the minimum number of fragments having the closest Z values are merged. This combines different fragments from the same surface, resulting in both storage and processing efficiency. When operating with opaque surfaces, Z3 can provide superior image quality over sparse supersampling methods that use eight samples per pixel while using storage for only three fragments. Z3 also makes the use of large numbers of samples (e.g., 16) feasible in inexpensive hardware, enabling higher quality images. It is simple to implement because it uses a small fixed number of fragments per pixel. Z3 can also provide order-independent transparency even if many transparent surfaces are present. Moreover, unlike the original A-buffer algorithm it correctly antialiases interpenetrating transparent surfaces because it has three-dimensional Z information within each pixel.

Table of contents conference proceedings

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7
A Low-Cost Memory Architecture For PCI-Based Interactive Ray Casting
Doggett, Michael / Meißner, Michael / Kanust, Urs | 1999
15
Hybrid Volume and Polygon Rendering with Cube Hardware
Kreeger, Kevin / Kaufman, Arie | 1999
25
TriangleCaster - Extensions to 3D-Texturing Units For Accelerated Volume Rendering
Knittel, G. / SIGGRAPH / European Association for Computer Graphics | 1999
25
TRIANGLECASTER Extensions To 3BTexturing Units For Accelerated Volume Rendering
Knittel, Gunter | 1999
35
Fast Footprint MIPmapping
Huttner, T. / Strasser, W. / SIGGRAPH / European Association for Computer Graphics | 1999
35
Fast Footprint MlPmapping
Hüttner, Tobias / Straßer, Wolfgang | 1999
45
Antialiased Parameterized Solid Texturing Simplified for Consumer- Level Hardware Implementation
Hart, John C. / Carr, Nate / Karneya, Masaki / Tibbitts, Stephen A. / Coleman, Terrance J. | 1999
55
Multiresolution Rendering With Displacement Mapping
Gumhold, Stefan / Hüttner, Tobias | 1999
67
Optimal Depth Buffer for Low-Cost Graphics Hardware
Lapidous, Eugene / Jiao, Guofang | 1999
75
Adaptive Hierarchical Visibility in a Tiled Architecture
Xie, Feng / Shantz, Michael | 1999
85
Z3: An Economical Hardware Technique for High-Quality Antialiasing and Transparency
Jouppi, Norman P. / Chang, Chun-Fa | 1999
95
Parallel Texture Caching
lgehy, Homan / Eldridge, Matthew / Hanrahan, Pat | 1999
107
Load Balancing for Multi-Projector Rendering Systems
Samanta, Rudrajit / Zheng, Jiannan / Funkhouser, Thomas / Li, Kai / Singh, Jaswinder Pal | 1999
117
Texture Shaders
McCool, Michael D. / Heidrich, Wolfgang | 1999
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