Tight Frame Normal Map Compression - Graphics Hardware

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Overview• Introduction to normal mapping• Previous work• Tight Frame Compression• Evaluation
Previous Work• Surface normal compression [Deering 95]• S3 Texture Compression/DXTC [Iourcha99]• 3Dc [ATI05]• Dedicated format for normal maps• e3Dc [Munkberg 06]• Enhanced 3Dc with rotations and diff-coding• Adaptive bit rate [Wong06,Yang06]• Vector Quantization [Yamakasi et. al 06]
Page 1: Tight Frame Normal MapCompressionJa
Page 4: Normal Maps• Add geometric detail
Page 7 and 8: Normal Map Generation• Store the
Page 9: Motivation• We need compression!I
Page 13 and 14: 3Dc Overview• Divide the input fi
Page 15 and 16: 3Dc - Texel Quantization• Map eac
Page 17 and 18: Problems with 3Dc• Difficult scen
Page 19 and 20: Rotation Compression• Rotate coor
Page 21 and 22: Variable Point Distribution3DcVaria
Page 23 and 24: Differential Encoding• Slowly var
Page 25 and 26: Tight Frame Compression• Example:
Page 27 and 28: c○ Association for Computing M·
Page 29 and 30: Additional Mode• Unused bitcombin
Page 31 and 32: ely small compared to that of the s
Page 33 and 34: Evaluation• PSNR• Max error•
Page 35 and 36: deviation for the test suite. As ca
Page 37 and 38: ne-Möller Error / Tight distributi
Page 39 and 40: Original100 %3Dc93.3e3Dc95.7Tight F
Page 41 and 42: Conclusions• Higher quality than

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