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Grassland Clouds FG effect (324, rev. 1)
By  Dirbaio on 12-24-12, 12:27 pm
Category 'Effects and decorations', known, fully documented
it's sprite data is the same r to the other FG effects.
Data files:
• /polygon_unit/evf_tcloud1_a.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 Move: value at nybble 10. 0...15 where 0 is the slowest
Vertical Move: 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?
Grassland Clouds FG effect (324, rev. 2)
By  Hiccup on 08-07-13, 04:32 pm
Category 'Effects and decorations', known, fully documented
it's sprite data is the same r to the other FG effects.
Data files:
• /polygon_unit/evf_tcloud1_a.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 Move: value at nybble 10. 0...15 where 0 is the slowest
Vertical Move: value at nybble 11. 0...15 where 0 is the slowest
Contrast: list at nybble 5: 0=Dark,1=Light. Has something to do with the visibility of the FG effect?