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Fog FG effect (310, rev. 1)
By  Freeze on 03-29-13, 11:08 am
Category 'Effects and decorations', known
(no description)
Data files:
• /polygon_unit/evf_haze1.nsbtx
Sprite fields:
Opaque: value at nybble 6. 0...15 where 15 is completely opaque
Position: value at nybble 9. The higher the value, the higher the Texture position on the Y-axis
Scrolling speed: value at nybble 8. Scrolling when the screen moves. (0 scrolls with BG)
Movement Angle: list at nybble 4: 0=Left-Down,1=Left-Up,2=Right-Down,3=Right-Up
Horizontal Speed: value at nybble 10. 0...15 where 0 is the slowest
Vertical Speed: value at nybble 11. 0...15 where 0 is the slowest
Unknown: checkbox at nybble 5 with mask . Has something to do with the visibility of the FG effect?
Fog FG effect (310, rev. 2)
By  MeroMero on 08-29-13, 09:56 am
Category 'Effects and decorations', known, fully documented
Has the same values as sprites 315, 324* and 325*.
*To test.
Data files:
• /polygon_unit/evf_haze1.nsbtx
Sprite fields:
Direction: list at nybble 4: 0=Left-down,1=Left-up,2=Right-down,3=Right-up
Opacity: value at nybble 5-6. Modulo 32. 0 is transparent, 30 is almost opaque, 31 is completely red.
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.