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Snow FG effect 2 (313, rev. 4)
By  MeroMero on 08-29-13, 10:46 am
Category 'Effects and decorations', known, fully documented
Has the same data as sprites 311, 314, 316, 317, 318, 319, 320, 321 and 322.
Data files:
• /polygon_unit/evf_snow1_b.nsbtx
Sprite fields:
Swaying start position: value at nybble 4. Also doubles as a direction value (Modulo 4) if nybble 10 and/or nybble 11 are not null. 0 is left-down, 1 is left-up, 2 is right-down and 3 is right-up.
Swaying distance: value at nybble 5. 0 is static.
Swaying speed: value at nybble 6. 0 is static, 15 is the fastest.
Mixed shift: value at nybble 7. Shift horizontally and vertically.
Horizontal scrolling: value at nybble 8. 0 is the slowest, 15 is the fastest.
Vertical scrolling: value at nybble 9. 0 is the slowest, 15 is the fastest.
Horizontal speed: value at nybble 10. 0 is the slowest, 15 is the fastest.
Vertical speed: value at nybble 11. 0 is the slowest, 15 is the fastest.
Snow FG effect 2 (313, rev. 5)
By  MeroMero on 03-22-14, 09:33 am
Category 'Effects and decorations', known, fully documented
Has the same data as sprites 311, 314, 316, 317, 318, 319, 320, 321 and 322.
Data files:
• /polygon_unit/evf_snow1_b.nsbtx
Sprite fields:
Swaying start position: value at nybble 4. Also doubles as a direction value (Modulo 4) if nybble 10 and/or nybble 11 are not null. 0 is left-down, 1 is left-up, 2 is right-down and 3 is right-up.
Swaying distance: value at nybble 5. 0 is static.
Swaying speed: value at nybble 6. 0 is static, 15 is the fastest.
Mixed shift: value at nybble 7. Shift horizontally and vertically.
Horizontal scrolling: value at nybble 8. 1 is the slowest, 16 is the fastest.
Vertical scrolling: value at nybble 9. 1 is the slowest, 16 is the fastest.
Horizontal speed: value at nybble 10. 1 is the slowest, 16 is the fastest.
Vertical speed: value at nybble 11. 1 is the slowest, 16 is the fastest.