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Question by dodongoo · Sep 01, 2014 at 11:46 AM · velocitydirectionmove

Direction affecting speed

Hi, I'm making a simple 2D game for something like Pong and I've got a problem with the ball script. The script gets the hit point when colliding with player:

         var player : Transform = object.collider.gameObject.transform;
         var hitPoint : float = transform.position.y - player.position.y;
         hitPoint = Mathf.Clamp(hitPoint, -1, 1);

Then it sets "direction" variable based on the hitPoint variable. Next it moves the ball by changing it's velocity:

     transform.rigidbody2D.velocity = direction * speed;

The problem is that when the direction variable grows, the ball moves faster. It's kind of obvious, because 1 speed is always more than 0.3 speed. How to make this work?

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Answer by supericecream · Sep 01, 2014 at 12:58 PM

You are having a problem with vector maths.

Direction * Speed = Velocity

Is perfectly valid in vector maths, but, in your case, you should be doing:

 transform.rigidbody2D.velocity = new Vector2(direction.x * speed, direction.y * speed);

This is because transform.rigidbody2D.velocity is a vector (2 dimensional) value, your original method would give you a one dimensional value. The unity3d website has a short tutorial about vectors in their Script tutorial section if you need

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avatar image dodongoo · Sep 01, 2014 at 01:42 PM 0
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Thanks, it works fine now.

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Answer by Quaker_SDR · Sep 01, 2014 at 11:52 AM

Clamp it.

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