CODEWITHSUNDEEP
c#unity-game-engine
Quincy Norbert
Quincy Norbert

Reputation: 451

Trying to set something on another GameObjects local position?

I'm trying to set a GameObjects position relative to another GameObjects local position, but I'm not having alot of luck. With a raycast I check on which side the player stands, which is all working fine and I'm trying to create a transform relative to the localposition of the object depending on which side you stand on. When this object is not rotated it all works fine, but when I rotate the object the target positions seem to still be in worldspace. I have added images to illustrate the case.

Album with images illustrating the problem

if(right)
{
    Vector3 Pos1 = _pushableT.localPosition;
    Pos1.x = _pushableT.localPosition.x + distBetween;
    _targetPos = Pos1;
}

if (left)
{
    Vector3 Pos2 = _pushableT.localPosition;
    Pos2.x = _pushableT.localPosition.x - distBetween;
    _targetPos = Pos2;
}

if (front)
{
    Vector3 Pos3 = _pushableT.localPosition;
    Pos3.z = _pushableT.localPosition.z + distBetween;
    _targetPos = Pos3;
}

if (back)
{
    Vector3 Pos4 = _pushableT.localPosition;
    Pos4.z = _pushableT.localPosition.z - distBetween;
    _targetPos = Pos4;
}

targetBallDebug.position = _targetPos;

Upvotes: 0

Views: 49

Answers (1)

TANDEROID
TANDEROID

Reputation: 51

This will work fine for position of object, that looks at target, but not ideal for rotation in 3d space

using UnityEngine;

public class TrackToTarget : MonoBehaviour
{
    [SerializeField]
    private Transform target;

    private Vector3 releativePosition;
    private Quaternion targetRotationAtStartInv;
    private Quaternion rotationDiffernce;

    private void Start()
    {
        releativePosition = target.position - transform.position;
        targetRotationAtStartInv = Quaternion.Inverse(target.rotation);
        rotationDiffernce = target.rotation * transform.rotation;
    }

    private void Update()
    {
        transform.position = target.position - target.rotation * (targetRotationAtStartInv * releativePosition);
        transform.rotation = rotationDiffernce * target.rotation;
    }
}

Upvotes: 1

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