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Question by SMH17 · Jul 07, 2015 at 01:46 AM · animationjavascriptmovementunity5

Simple go forward and turn back loop movement stuck to the limit without reverse

I have a game object placed at the position (0, 5, 80)

I want that this object ciclically moves foward (direction x in my orientation) and then when has reached a certain position turn back until has reached another limit position and so on .

It's a very simple task but unfortunately when the object reaches the stop to move and desn't change direction.

See the video

I have written this function called in Update section

 function cyclicMove(){
     if(boat.position.x==-190){
         boat.rotation.y=-90;
     }
     else if(boat.position.x==190){
         boat.rotation.y=90;
     }
     else if(boat.position.x>-190){
         boat.position.x--;
     }
     else if(boat.position.x<190){
         boat.position.x++;
     }
 }

The object should turn in 190 and -190c continuing the movement in the other direction but for some reason this doesn't happen.

Any suggestion?

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Answer by SMH17 · Jul 07, 2015 at 02:33 PM

Here the solution. When the boat rotate the movement coordinated are inverted. With this edit to the original code, now works.

    function cyclicMove(limit:int, speed:int){
         position=boat.position.x;
         if(position <= -limit){
             turnBack();
          }
         else if(position >= limit){
             turnBack();
         }
         moveForward(speed);    
 }
     
     function turnBack() {
         boat.rotation.y=boat.rotation.y*-1;
     }
 
 function moveForward(speed:float) {
     boat.position -= transform.forward * speed * Time.deltaTime;
 }


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Answer by Bluk · Jul 07, 2015 at 11:19 AM

 function cyclicMove(){
      if(boat.position.x <= -190){
          boat.rotation.y=-90;
      }
      else if(boat.position.x >= 190){
          boat.rotation.y=90;
      }
      else if(boat.position.x > -190){
          boat.position.x--;
      }
      else if(boat.position.x < 190){
          boat.position.x++;
      }
  }

It should do the trick. Be careful though that the last else if is not reached if you have for example boat.position.x = 0

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avatar image SMH17 · Jul 07, 2015 at 11:45 AM 0
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Similar problem also with your code... the object doesn't reverse movement.

avatar image SMH17 · Jul 07, 2015 at 01:53 PM 0
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in addition the rotation coordinate y become 180 for some reason

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