PIM_8/Assets/_Scripts/HighlightOnApproach.cs

using UnityEngine;

public class HighlightOnApproach : MonoBehaviour
{
    public Transform player;
    public Renderer targetRenderer;
    public Renderer[] targetRenderers;
    public Material highlightMaterial;
    public float radius = 2.6f;

    private Material originalMaterial;
    private Material[] originalMaterials;
    private bool highlighted;

    private void Start()
    {
        if (targetRenderers == null || targetRenderers.Length == 0)
        {
            targetRenderers = targetRenderer != null ? new[] { targetRenderer } : GetComponentsInChildren<Renderer>();
        }

        originalMaterials = new Material[targetRenderers.Length];

        for (int i = 0; i < targetRenderers.Length; i++)
        {
            originalMaterials[i] = targetRenderers[i].sharedMaterial;
        }

        if (targetRenderers.Length > 0)
        {
            originalMaterial = originalMaterials[0];
        }
    }

    private void Update()
    {
        if (player == null)
        {
            GameObject playerObject = GameObject.FindGameObjectWithTag("Player");
            player = playerObject != null ? playerObject.transform : null;
        }

        if (player == null || highlightMaterial == null)
        {
            return;
        }

        bool shouldHighlight = Vector3.Distance(transform.position, player.position) <= radius;

        if (shouldHighlight != highlighted)
        {
            // The scene builder assigns all statue renderers, so the whole object changes material together.
            SetHighlighted(shouldHighlight);
        }
    }

    private void SetHighlighted(bool value)
    {
        highlighted = value;

        for (int i = 0; i < targetRenderers.Length; i++)
        {
            if (targetRenderers[i] == null)
            {
                continue;
            }

            targetRenderers[i].sharedMaterial = value ? highlightMaterial : originalMaterials[i];
        }
    }

    public Material GetOriginalMaterial()
    {
        return originalMaterial;
    }
}