How can I make the objects to move at the same speed as the lines?

Question

void Update()
    {
        if (animateLines)
        {
            counter++;
            for (int i = 0; i < allLines.Length; i++)
            {
                Vector3 endPos = allLines[i].GetComponent<EndHolder>().EndVector;
                Vector3 startPos = allLines[i].GetComponent<LineRenderer>().GetPosition(0);
                Vector3 tempPos = Vector3.Lerp(startPos, endPos, counter / 500f * speed);

                allLines[i].GetComponent<LineRenderer>().SetPosition(1, tempPos);

                instancesToMove[i].transform.position =
                    Vector3.MoveTowards(endPos, startPos, counter / 500f * speed);
            }
        }
        else
        {
            counter = 0;
            foreach (GameObject thisline in allLines)
            {
                thisline.GetComponent<LineRenderer>().SetPosition(1, thisline.GetComponent<LineRenderer>().GetPosition(0));
            }
        }
    }

The lines are LineRenderer.

void SpawnLineGenerator(Vector3 start, Vector3 end, Color color)
    {
        GameObject myLine = new GameObject();

        myLine.tag = "FrameLine";
        myLine.name = "FrameLine";

        myLine.AddComponent<LineRenderer>();
        myLine.AddComponent<EndHolder>();
        myLine.GetComponent<EndHolder>().EndVector = end;
        LineRenderer lr = myLine.GetComponent<LineRenderer>();
        lr.material = new Material(Shader.Find("Particles/Alpha Blended Premultiply"));
        lr.startColor = color;
        lr.useWorldSpace = false;
        lr.endColor = color;
        lr.startWidth = 0.1f;//0.03f;
        lr.endWidth = 0.1f;//0.03f;
        lr.SetPosition(0, start);
        lr.SetPosition(1, start);
    }

So I have lines each new gameobject have a LineRenderer component and inside Update I'm animating the lines with some speed.

Now I want to move the instancesToMove (GameObject[] ) with the same speed as the lines but the instancesToMove are moving much slower then the lines.

I tried:

instancesToMove[i].transform.position =
                        Vector3.MoveTowards(endPos, startPos, speed);

Then

instancesToMove[i].transform.position =
                        Vector3.MoveTowards(endPos, startPos, speed * Time.deltaTime);

But it's never moving with the same lines speed.

Answer 1

I think what you probably want to do is move your object first, then move the line to meet it:

// Move the object toward endPos at speed over the duration of the frame.
Vector3 objectPosition = instancesToMove[i].transform.position;
objectPosition = Vector3.MoveTowards(
                     objectPosition,        // Where we are so far.
                     endPos,                // Where we want to go.
                     speed * Time.deltaTime // How far to move this frame.
                 );
instancesToMove[i].transform.position = objectPosition;

// Snap the line to meet it there.
allLines[i].GetComponent<LineRenderer>().SetPosition(1, objectPosition);

This will work best if your lines are set to draw in worldspace, but we can convert this to their local space too if you need.

If you just need transforms from your array instancesToMove, I'd make that an array of Transform[] to save you a .transform every time. Similarly, it's better to type your allLines as an array of LineRenderer[] so you don't need to search for components with .GetComponent<>() many times every frame. That's just needless overhead. ;)