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VFX 텍스쳐압축 Ⅱ
그래픽디자인실 VFX Team : 채문배
ETC2의 문제
• ETC2 4bit는 ETC1으로 호환이 된다는데……………..
ETC2 8bit는????
• Alpha를 포함하는 압축포맷은 RGBA32bit , RGBA16bit, DXT5
그럼 알파는 쓰지마?
• RGBA16bit = 화질 최악 ( 계단현상 )
• DXT5 = 지원하는 모바일 디바이스가 더 적음
• RGBA32bit = 무겁다
정답
유니티 기본 압축포맷
• Alpha를 포함하지 않은 24bit 텍스쳐를 제작하고
• 알파값은 쉐이더에서 계산
• 알파텍스쳐는 R,G,B 3장의 Mask로 활용
활용 예
알파가 필요한 텍스쳐 3장을 사용하는 경우 ( 512*512 기준 )
ETC1RGBA TrueColor 32bit 3장 사용 = 3.9MB
RGB 16bit 3장 사용 = 2.1MB
ETC1 RGB3장 + Alpha1장 = 512KB
7
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