How to define a motion trajectory?

Getting Started
1

Hi

I would like to ask how to define the trajectory of motion using unity 3D. I have object 1 and object 2. When the distance is less than a defined threshold, the object 1 has to move to the object 2 along the motion-trajectory from the sketch. How to define this motion trajectory using unity 3D? The motion is realized after pushing a key from the PC keyboard.

Could you please help me to resolve the problem?

2883102--211727--Pic1.jpg
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2

That trajectory appears to be a straight line. You can do this trivially by calling MoveTowards in an Update method. (In fact the sample script in the docs there is pretty much exactly what you want.)

1 Like
3

Hi,

I tried to use MoveTowards but without success. Could you please help me to resolve the problem?
Here is my code:

publicclassNeedleMove : MonoBehaviour {

publicGameObject Point_Sphere;
publicGameObject Cell;

publicTransform target;

publicfloat speed;

// Update is called once per frame

void Update () {

if (Input.GetKey(KeyCode.P))

{
Cell.transform.position = Vector3.MoveTowards(Cell.transform.position, target.position, 10.00f * Time.deltaTime);
}

}

4

You haven’t described what the problem is. Your code looks correct (assuming you want Cell to move towards target at 10 units/second while the P key is held down).

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5

Is that a direct copy and paste? Because there are spaces missing in some very key locations and one bracket is missing.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NeedleMove : MonoBehaviour
{
    public GameObject Point_Sphere;
    public GameObject Cell;

    public Transform target;

    public float speed;

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKey(KeyCode.P))
        {
            Cell.transform.position = Vector3.MoveTowards(Cell.transform.position, target.position, 10.00f * Time.deltaTime);
        }
    }
}
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6

Hi
The problem is that the Cell object doesn’t move to the target position after pressing the key button “P”.

7

Here are screeshots of my application.

2959552--219669--Screen1.jpg
2959552--219669--Screen1.jpg1280Ă—1024 231 KB

2959552--219670--Screen2.jpg
2959552--219670--Screen2.jpg1280Ă—1024 223 KB

2959552--219671--Screen3.jpg
2959552--219671--Screen3.jpg1280Ă—1024 236 KB

8

Do you mean while pressing “P”? Because the way you’ve written it, it will only move while the key is held down.

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9

Yes
Something is wrong. It doesn’t work while the key is held down.

10

Is the script attached to anything in the scene?

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11

Yes it was. I deselected it but it is still not working. The script is not attached to the cell object. Is it an error?

12

Put a Debug.Log() statement inside the if condition to make sure it’s getting called.

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13

Everything is OK. I wrote the script again.
Thank you for the help.