Updated Track Data (markdown)

Track-Data.md

@@ -327,6 +327,53 @@ More data about each track piece lives in a few different places in the game. Fi
 
 ## Height/Direction Change Data
 
-Data about the height and direction change of track pieces is stored in 11-byte structs, beginning at 0x994e34. However, the structs here **do not** map 1:1 with track pieces. Instead, use the lookup table beginning at `0x994a38` to determine which struct corresponds to your given track piece.
+Data about the height and direction change of track pieces is stored in 11-byte
+structs, beginning at `0x994e34`. However, the structs here **do not** map 1:1
+with track pieces. Instead, use the lookup table beginning at `0x994a38` to
+determine which struct corresponds to your given track piece.
 
-There are two lookup tables, one at `0x994a38` and one at `0x994632`. I am not sure yet which one is used in which situations, though it depends on whether a flag is set at bit 20 of the ride struct beginning at `0x97CF40`.
+There are two lookup tables, one at `0x994a38` and one at `0x994632`. I am not
+sure yet which one is used in which situations, though it depends on whether a
+flag is set at bit 20 of the ride struct beginning at `0x97CF40`.
+
+Here's the breakdown of those 11 byte structs
+
+##### bytes 0-4
+
+all empty, as far as I can tell
+
+##### byte 5
+
+contains flags relating to helixes and loops
+
+##### byte 6
+
+255 if a loop piece that ends going downward, else 0
+
+##### byte 7
+
+These seem to track the height change required by the piece. 16 represents a
+height change of 1 unit, but there are also 8 and 12 represented. check byte 8
+for the direction.
+
+Some of this is confusing; a helix up piece should have at least some height
+change but instead is 0 in the code. Bit 3 set means "helix down"
+
+##### byte 8
+
+bit 0: always set (?)
+bit 1: 0 if track piece starts diagonal, 1 if track piece starts orthogonal
+bit 2: if 0, right turn
+bit 3: if 0, left turn
+bit 4 or 5: if either is 1, track starts or finishes downhill
+bit 6 or 7: if either is 1, track starts or finishes uphill
+
+So a flat track piece with no turns would be 15.
+
+##### byte 9
+
+4 if the track piece starts or ends at a 90 degree angle. 0 otherwise.
+
+##### byte 10
+
+is either 1 or 255, 1 if a turn?