koobas.hobune.stream
calculating the midpoint of two objects
i am trying to make an object go to the midpoint of two characters in my game and stay there but its not working, here's my script:
var mark : Transform;
var josh : Transform;
function Update () {
transform.position.x = josh.position.x + (mark.position.x - josh.position.x /2);
transform.position.y = josh.position.y + (mark.position.y - josh.position.y /2);
transform.position.z = josh.position.z + (mark.position.z - josh.position.z /2);
}
whenever i start the game the sphere just goes way off screen, does anyone know what im doing wrong?
In programming and math, division is always evaluated before subtraction.
(mark.position.x - josh.position.x /2)
is exactly the same as
mark.position.x - (josh.position.x /2)
So instead, you should use
transform.position.x = josh.position.x + (mark.position.x - josh.position.x) / 2;
this is true !!! but i cant understand why ???
mid point between A and B is (A+B)/2
why it is A+(B-A)/2 !!!!!!
A+(B-A)/2 = A+(B/2)-(A/2) = (A-A/2)+(B/2) = (1A - (1/2)A) + (B/2) = (1/2)A + (B/2) = (A/2) + (B/2) = (A+B)/2
Right, the approach (A+B)/2 is a more "mathematical approach" as it's just the arithmetic mean.
The approach A+(B-A)/2 is more a "vectorial approach". "A" is the starting point "(B-A)" is a relative direction vector from the start (A) to the end (B). Adding that vector back to our starting point we get to the end (B). By taking half of that vector we only move half way towards B. So the resulting point is exactly halfway between A and B.
The great thing about that approach is that you're not limited to the midpoint. You could easily calculate 1/3 or 2/3 of the distance which doesn't work with the arithmetic mean.
The midpoint of A and B is (A+B)/2. You have A+B-A/2;
Try: transform.position = (josh.position + mark.position)/2;
Since this is still the first answer I found on Google in 2021, I decided to add a shorter solution, using Unity's Vector3.Lerp() to interpolate between two positions.
transform.position = Vector3.Lerp(josh.position, mark.position, 0.5f);
This method could also be used for any division other than 1/2.
In my current project, my enemies need to judge the distance to 2 different vector position on the players. in order to determine if they are facing them or not. But I want them to "target" and run to a point between those two vectors. Here is how I did that:
[Range(0,1)]
public float myFloatVariable; // can precisely place the spot to "target" in editor.
public Vector3 drawPointOnCurrentTarget;
Vector3 a = new Vector3(GameObjectRepresentingFace.x, GameObjectRepresentingFace.y);
Vector3 b = new Vector3(GameObjectRepresentingBody.x, GameObjectRepresentingBody.y);
drawPointOnCurrentTarget = a + ((b - a).normalized * myFloatVariable);
float distanceToTarget = Vector3.Distance(drawPointOnCurrentTarget, transform.position);
Debug.DrawLine(drawPointOnCurrentTarget, transform.position, Color.red);
Hope this helps someone stumbling onto this question.
