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fix: faces/frames/slices indexed wrong by 1 (unnoticed by automatic c… #61

Job	Run time
build-linux (Debug, Source)	2m 49s
build-msvc (Debug, Source)	3m 20s
build-linux (Debug, StrataSource)	2m 21s
build-msvc (Debug, StrataSource)	3m 14s
build-linux (Release, Source)	2m 28s
build-msvc (Release, Source)	3m 39s
build-linux (Release, StrataSource)	2m 52s
build-msvc (Release, StrataSource)	5m 45s
	26m 28s

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