CapersProject/Assets/02.Scripts/FadeableObject.cs

using System;
using System.Collections;
using Sirenix.OdinInspector;
using UnityEngine;

namespace BlueWater
{
    public class FadeableObject : MonoBehaviour
    {
        [field: SerializeField]
        public bool IsFadeable { get; private set; }
        
        [SerializeField, ShowIf("@IsFadeable")]
        private Material _transparentMaterial;
        
        [SerializeField, Range(0f, 1f), ShowIf("@IsFadeable")]
        private float _transparency;

        [SerializeField, Range(0f, 2f), ShowIf("@IsFadeable")]
        private float _fadeDuration = 0.5f;

        private Renderer _currentRenderer;
        private Material _originalMaterial;
        private Material _newMaterial;
        private Coroutine _currentCoroutine;
        private bool _isTransparent;

        private void Start()
        {
            if (!IsFadeable) return;
            
            _currentRenderer = GetComponentInChildren<Renderer>();
            _originalMaterial = _currentRenderer.material;
            _newMaterial = new Material(_transparentMaterial);
        }

        private void OnDestroy()
        {
            StopAllCoroutines();
        }

        public void SetTransparent()
        {
            if (_isTransparent) return;
            
            if (_currentCoroutine != null)
            {
                StopCoroutine(_currentCoroutine);
            }
            _currentCoroutine = StartCoroutine(FadeToTransparent());
        }
        
        public void RestoreOriginal()
        {
            if (!_isTransparent) return;
            
            if (_currentCoroutine != null)
            {
                StopCoroutine(_currentCoroutine);
            }
            _currentCoroutine = StartCoroutine(RestoreMaterial());
        }

        private IEnumerator FadeToTransparent()
        {
            _isTransparent = true;
            _currentRenderer.material = _newMaterial;
            var startAlpha = _currentRenderer.material.color.a;
            var duration = _fadeDuration * Mathf.Abs(startAlpha - _transparency);
            var elapsedTime = 0f;

            while (elapsedTime < duration)
            {
                var alpha = Mathf.Lerp(startAlpha, _transparency, elapsedTime / duration);
                var color = _currentRenderer.material.color;
                color.a = alpha;
                _currentRenderer.material.color = color;

                elapsedTime += Time.deltaTime;
                yield return null;
            }

            var finalColor = _currentRenderer.material.color;
            finalColor.a = _transparency;
            _currentRenderer.material.color = finalColor;
        }

        private IEnumerator RestoreMaterial()
        {
            _isTransparent = false;
            var startAlpha = _currentRenderer.material.color.a;
            var targetAlpha = _originalMaterial.color.a;
            var duration = _fadeDuration * Mathf.Abs(startAlpha - targetAlpha);
            var elapsedTime = 0f;

            while (elapsedTime < duration)
            {
                var alpha = Mathf.Lerp(startAlpha, targetAlpha, elapsedTime / duration);
                var color = _currentRenderer.material.color;
                color.a = alpha;
                _currentRenderer.material.color = color;

                elapsedTime += Time.deltaTime;
                yield return null;
            }

            _currentRenderer.material = _originalMaterial;
        }
    }
}