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Question by Trond · Apr 02, 2014 at 07:21 PM · waterwaveocean

Wave formula(s) (math)

Hey, i am making a game where you control a ship on a rough ocean and have to fight the waves and other ships.

I have the wave "simulation" working fine, that is using overlapping sinus waves. However, pure sinus waves looks a bit dull, and i was wondering if anyone knows any other mathematical approaches for creating "sinus-like" waves? Maybe some with a sharper top than a sinus wave, and some tilting forward like waves that are about to collapse.

Also, as it currently stands waves have a center and moves in one specific direction. I would like the ability to create a wave which moves out from a center, like when you throw a rock into water in real life. Do anyone know how to do this?

Thanks for any answers! :)

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Answer by fafase · Apr 02, 2014 at 07:28 PM

Triangle wave may be your solution: http://en.wikipedia.org/wiki/Triangle_wave

but when you will see the equation, I guess you will be happy with your sin wave.

Other solution is just to move left to right and downward:

 float maxLeft, maxRight;
 bool direction = true;
 
 void Update()
 {
      Vector3 pos = transform.position;
      pos.y -= speed *Time.deltaTime;
      if(direction)
      {
          pos.x += speed *Time.deltaTime;
          if(pos.x >= maxRight)direction = false;
      }
      else
      {
          pos.x -= speed *Time.deltaTime;
          if(pos.x <= maxLeft)direction = true;
      }
 }

You could use some more technical way with MoveTowards and placing game objects to mark the target points but this one above is understandable.

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avatar image AlucardJay · Apr 04, 2014 at 04:17 PM 1
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For the ripple effect, maybe exa$$anonymous$$ing the code in this demo may help (scroll down to UnityRippleTest for Unity project download link).

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