Workshop › OutRun-style Racer › Step 28 of 44

Curves pull you outwards

What we are doing

Like a real car, a curve pushes you outwards, and much harder the faster you go: with the speed squared. In gentle curves steering wins easily; in the sharpest ones at top speed the pull is stronger, and you must lift off the gas.

```js
// Steering works better the faster you go; curves push you outwards.
const steer = (keys.ArrowRight ? 1 : 0) - (keys.ArrowLeft ? 1 : 0)
playerX += steer * 0.04 * ratio
playerX -= segmentAt(position + PLAYER_Z).curve * 0.012 * ratio * ratio
```

What it means

• The curve under the car times 0.012 times ratio squared is subtracted from playerX: a right curve (positive) pushes you left.
• At top speed a curve of 4 pulls 0.048 per frame, more than the 0.04 of full steering.

Your turn

Add ; curves push you outwards to the comment, and under the steering line write the pull line.

Skills: Velocity and gravity

← Which segment am I on? Other cars →

All steps

1. Sky and ground
2. Draw again and again
3. Perspective
4. One piece of road
5. A road made of segments
6. Where we are on the track
7. The road ahead
8. Stripes
9. Paint from far to near
10. Kerbs and a center line
11. Striped grass
12. Moving is one number
13. Which keys are down?
14. The gas pedal
15. Brake, coast and a top speed
16. Your car
17. Speedometer
18. A pedal for phones
19. Move the camera sideways
20. Steering
21. No turning on the spot
22. The grass is slow
23. Steering by touch
24. A track with curves
25. Bend the road
26. No jumps in the curve
27. Which segment am I on?
28. Curves pull you outwards
29. Other cars
30. Distance on a loop
31. Cars that shrink with distance
32. Traffic moves
33. Rear-end crash
34. Counting laps
35. Show the lap
36. A lap timer
37. Show the time
38. Best lap
39. Show the best lap
40. Racing or finished
41. The finish line
42. Finished!
43. Race again
44. Build it yourself: beat the clock