當使用 ik 看目標時，如果目標圍繞玩家旋轉，而目標來自后面，玩家卻沒有看它，為什么？

Question

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

[RequireComponent(typeof(Animator))]
public class TestingIK : MonoBehaviour
{
    public List<Transform> lookObjects = new List<Transform>();
    public float weightDamping = 1.5f;

    private Animator animator;
    private Transform lastPrimaryTarget;
    private float lerpEndDistance = 0.1f;
    private float finalLookWeight = 0;
    private bool transitionToNextTarget = false;

    void Start()
    {
        animator = GetComponent<Animator>();
    }

    // Callback for calculating IK
    void OnAnimatorIK()
    {
        if (lookObjects != null)
        {
            Transform primaryTarget = null;
            float closestLookWeight = 0;

            // Here we find the target which is closest (by angle) to the players view line
            foreach (Transform target in lookObjects)
            {
                Vector3 lookAt = target.position - transform.position;
                lookAt.y = 0f;
                float dotProduct = Vector3.Dot(new Vector3(transform.forward.x, 0f, transform.forward.z).normalized, lookAt.normalized);
                float lookWeight = Mathf.Clamp(dotProduct, 0f, 1f);
                if (lookWeight > closestLookWeight)
                {
                    closestLookWeight = lookWeight;
                    primaryTarget = target;
                }
            }

            if (primaryTarget != null)
            {
                if ((lastPrimaryTarget != null) && (lastPrimaryTarget != primaryTarget) && (finalLookWeight > 0f))
                {
                    // Here we start a new transition because the player looks already to a target but
                    // we have found another target the player should look at
                    transitionToNextTarget = true;
                }
            }

            // The player is in a neutral look position but has found a new target
            if ((primaryTarget != null) && !transitionToNextTarget)
            {
                lastPrimaryTarget = primaryTarget;
                finalLookWeight = Mathf.Lerp(finalLookWeight, closestLookWeight, Time.deltaTime * weightDamping);
                float bodyWeight = finalLookWeight * .75f;
                animator.SetLookAtWeight(finalLookWeight, bodyWeight, 1f);
                animator.SetLookAtPosition(primaryTarget.position);
            }

            // Let the player smoothly look away from the last target to the neutral look position
            if ((primaryTarget == null && lastPrimaryTarget != null) || transitionToNextTarget)
            {
                finalLookWeight = Mathf.Lerp(finalLookWeight, 0f, Time.deltaTime * weightDamping);
                float bodyWeight = finalLookWeight * .75f;
                animator.SetLookAtWeight(finalLookWeight, bodyWeight, 1f);
                animator.SetLookAtPosition(lastPrimaryTarget.position);
                if (finalLookWeight < lerpEndDistance)
                {
                    transitionToNextTarget = false;
                    finalLookWeight = 0f;
                    lastPrimaryTarget = null;
                }
            }
        }
    }
}

我有一個圍繞玩家轉圈的立方體。

當立方體從左側移到玩家身后時，玩家會稍微向后看，然后將頭返回，但是當立方體從右側返回時，玩家根本沒有看它，他開始只有當立方體幾乎就在他面前時才看立方體。

當立方體從右側從后面回到前面時，右側不活動。

更新 ：

我發現如果我改變這條線

float dotProduct = Vector3.Dot(new Vector3(transform.forward.x, 0f, transform.forward.z).normalized, lookAt.normalized);

在 x 和 z 的前向前加上減號：

float dotProduct = Vector3.Dot(new Vector3(-transform.forward.x, 0f, -transform.forward.z).normalized, lookAt.normalized);

現在，當對象從右側從后面進來但現在左側不工作時，它會正常工作。

所以它要么是從前到后的左側，沒有減號，要么是從后到前的右側，有減號。

我該如何解決它，以便它可以在前面/后面平等地工作？

Answer 1

Vector3.Dot當目標在玩家身后時會返回負數，不幸的是你將結果鉗制為 [0, 1] 並且最小權重為 0，這就是后面目標被忽略的原因。

要修復它，請直接使用點積值並使用足夠小的初始權重。

float closestLookWeight = float.MinValue;
float lookWeight = dotProduct;