Question by DaRaccoon · Oct 27, 2018 at 05:07 PM · unity 2d rigidbody2d vector2

Push an Object with a vector created from two points.

Hi, i wanted to push my Player in the direction of a vector created with the coordinate of mouseDown and mouseUp. I know, by reading in other questions, that to get a direction vector with those two coordinate i just have to create a Vector2 direction = mouseDownPosition - mouseUpPosition by using the designated void functions, but i seem to get the forces of the push wrong. if i have a fixed value pushForce, what RigidBody2D function should i use to make it seem like a "catapult-y" push? if i just use GetComponent.AddForce(direction * pushForce) the character moves but with almost no "x" force and too much "y" force. Here's what happens on my OnMouseUp() function:

 public float pushForce = 10.0f;
 
 private void OnMouseUp()
         {
             mouseUp = Input.mousePosition;
             Vector2 pushCharacter = mouseDown - mouseUp;              
             GetComponent<Rigidbody2D>().AddForce(pushCharacter * pushForce);       
         }

i know pushForce could seem little but it's just to make you see what kind of value i use, i tried with every kind of number but the problem it's always the same. for mouseDown i used the same method i used for mouseUp.

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hexagonius · Oct 27, 2018 at 05:22 PM 0

the way you create the vector is towards mouse down. in addition, mouse positions are in screenspace, which can just usually does not match what the camera sees. transform the points into world space and calculate their force there. and then there's a version of AddForce with a second parameter where you can define how and if with mass considered you want to fire it off.