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Use the original handling, walls and projection from the executable

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Decoded from SKIDMARKS_CD32's machine code:

- Car physics: the per-frame engine/grip/steering update, gravity and
  jumps, the hill effect on the throttle, and body tilt. Replaces the
  reconstructed handling model.
- The meaning of every .set value (separate drag, grip and power for
  human and computer drivers; steering, gravity, tow hitch), and the
  six handling presets, offered by a new Handling menu option.
- Walls: the road edges are quadratic B-splines through the gates'
  ends. They match the painted road edges.
- The real projection, which lifts points by their height; the height
  map is indexed by world cells, not screen pixels.
- Tracks have one more gate than the stored count: the last gate was
  being dropped on every track.

Computer drivers now follow the road between the walls and steer like
the original's. Vehicle assets store the values as `handling`; older
files still load. Docs describe the decoded logic.
This commit is contained in:
andy
2026-10-20 07:32:46 +00:00
parent ee895e0455
commit 6226c88d4e
44 changed files with 1283 additions and 791 deletions
Download Patch File Download Diff File Expand all files Collapse all files
assets/tracks/track3-6/track.txt
+9 -5
View File
@@ -1,11 +1,14 @@
# Skids track TRACK3-6. Lines starting with # are comments.
#
# The picture is track.png: 1024x512, 16 colours. Its palette is the
# track's palette. Colours 8-15 are road (full grip), 0-7 are scenery.
# track's palette. Colours 8-15 are road, 0-7 are scenery (dusty).
#
# gate x1 y1 x2 y2: lap gates in race order, in world units. Gate 0 is
# the start/finish line; the grid forms up behind it. World to picture:
# picture x = wx - wy + 512, picture y = (wx + wy) * 31/64 - 252
# the start/finish line; the grid forms up behind it. The gates' ends
# also shape the walls: each edge of the road is a smooth curve
# through the matching ends of the gates. World to picture, for a
# point at height z (pixels):
# picture x = wx - wy + 512, picture y = (wx + wy) / 2 - 156 - z
gate 486.125 379.375 471.1875 273.8125
gate 441.75 391.25 369.125 274.875
gate 404.875 417.625 314.8125 321.1875
@@ -46,6 +49,7 @@ gate 785.40625 579.625 944.625 631.8125
gate 796.78125 544.59375 896.84375 523.4375
gate 760.125 503.53125 816.78125 446.34375
gate 658.5 417.5 705.75 366.25
gate 585.5625 383.1875 589.46875 297.03125
# Name of the set of tracks this one belongs to, shown in the menu.
set Surf 'n' Slam
@@ -54,8 +58,8 @@ set Surf 'n' Slam
start 356 188
flags 0
# height: 64 rows of 64 values, ground height x 256. Each value covers
# 16x8 pixels of the picture.
# height: 64 rows (world y) of 64 values (world x), ground height in
# pixels x 64. Each value covers 16 x 16 world units.
height
6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400
6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400 6400