How to do a real time changeable offset?

Question

How can I add an offset to an object so that it can be adjusted while the game is running by changing the offset values in the inspector?

I tried this: object.transform.position = object.transform.position + offsetVector3;

but its causing the object to animate and fly off the screen presumably because its being called every frame in Update, so how can I have it update in real time but also stay put?

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Answer by BaronScreenKiller · Jul 03, 2017 at 04:11 AM

So the issue is that your adding the offset to the position every frame like you said. Picture this in 1 dimension.

frame 1. position = 0, offset = 1 so new position = 1 frame 2. position = 1, offset = 1 so new position = 2 frame 3. position = 2, offset = 1 so new position = 3

It will keep adding the offset every frame.

I would fix it be storing the original position at the start and adding the offset to that. frame 1. original position = position position = original position + offset frame 2. position = original position + offset frame 2. position = original position + offset

that way it's stable.

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mostlyhuman · Jul 03, 2017 at 04:22 AM 0

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Okay gotchya, here are a couple things, let me explain a little more in detail. Its a script for a character to pickup an item when they walk over it. The item isnt known until the collision happens, once the collision with the proper object happens it parents that object to the character. Its a cartoony game so im just having the item float around the character while it walks and wanted to use the offset so i could have each item have their own offset as to where the item will float around the character (above, below, in front etc).

What I tried from your suggestion was adding in the oncollisionenter that originalPos = currentItemPos, i put this after it was parented, but when i ran the code this just made the item stand there and wobble independently of the character and not follow the character. heres what I have so far and thank you so much for your help i sincerely appreciate it!

 public class Inventory : $$anonymous$$onoBehaviour {
 
     GameObject currentItem = null;
     IsPickupable isPickupable;
     Vector3 originalItemPos;
 
     void Update()
     {
         if (currentItem != null)
         {
             currentItem.transform.position = originalItemPos + isPickupable.GetCarryItemOffset();
             //currentItem.transform.rotation = Quaternion.Euler(isPickupable.GetCarryRotation());
         }
     }
 
     private void OnCollisionEnter(Collision collision)
     {
         if (collision.gameObject.GetComponent("IsPickupable") != null && currentItem == null)
         {
             currentItem = collision.gameObject;
             currentItem.gameObject.GetComponent<Rigidbody>().is$$anonymous$$inematic = true;
             currentItem.gameObject.GetComponent<Collider>().enabled = false;
             isPickupable = currentItem.gameObject.GetComponent<IsPickupable>();
             currentItem.gameObject.transform.parent = transform.Find("$$anonymous$$aster/Character1_Reference/Character1_Hips/Character1_Spine/Character1_Spine1/Character1_Spine2/");
             originalItemPos = currentItem.transform.position;
         }
     }
 }

BaronScreenKiller mostlyhuman · Jul 03, 2017 at 04:29 AM 1

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right, so the point that you want to offset from (the player position) changes every frame right? so could you do something like:

Object Position = Player Position + offset

The extra Original Position variable is just to stop that feedback loop. if you can dynamically reference the position you want to offset from thats better.

The other option is to use the local position (transform.localPosition) which is the position relative to the parent.

transform.localPosition = offset;

is the same as

transform.position = transform.parent.position + offset;

mostlyhuman BaronScreenKiller · Jul 03, 2017 at 04:31 AM 0

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Thank you so much! i feel silly overlooking something so simple :) Object Position = Player Position + offset worked perfectly.

How to do a real time changeable offset?

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