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Question by Loffen7 · Nov 18, 2020 at 09:35 PM · c#lerpcarracingcar game

changing rpm when shifting

I am making a 2d racing game. The problem i ran into is when im shifting up i want the rpm to change. So that when i shift up i can say: "engineRpm -= 3000;". And it does do that, but for only one "update sequence". When the next "update sequence" is called it instantly jumps back to what it was before. I thought lerping was the answer, that the rpm would slowly build up from when i shifted. But as i said that was not the case. Any ideas on how i can fix this? Thanks in advance! Here's my code in C#:

     // lerping the rpm in FixedUpdate().
     engineRpm = Mathf.Lerp(0, Input.GetAxis("Vertical") * 8000, 2);

That is used in FixedUpdate() (if that helps you to know)

 // changing gears in regular Update().
 void Gears()
 {
     if (Input.GetKeyDown(KeyCode.E))
     {
         gearNum++;
         engineRpm -= 3000;
         StartCoroutine(DragTime());
     }
     if (Input.GetKeyDown(KeyCode.Q))
     {
         gearNum--;
     }
 }

And that one in regular Update(). Btw: DragTime is just to slow the car down for a bit to make it more realistic.

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Best Answer

Answer by Loffen7 · Nov 19, 2020 at 03:04 PM

Just found a solution to this! I replaced:

  engineRpm = Mathf.Lerp(0, Input.GetAxis("Vertical") * 8000, 2);

With:

  engineRpm = Mathf.Lerp(engineRpm, Input.GetAxis("Vertical") * 8000, Time.deltaTime / gearNum);
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