modular-vr/Assets/Desert/Runtime/Emission.cs

using UnityEngine;

namespace EscapeRoomEngine.Desert.Runtime
{
    public class Emission : MonoBehaviour
    {
        private static readonly int EmissionColorNameID = Shader.PropertyToID("_EmissionColor");
        
        internal bool active;
        [ColorUsage(false, true)] public Color color;
        
        private bool _previousActive;
        private Color _previousColor;
        private Material _material;

        private void Awake()
        {
            _material = GetComponent<Renderer>().material;
        }

        private void Start()
        {
            ChangedToggle();
            ChangedColor();
        }

        private void Update()
        {
            if (_previousActive != active)
            {
                ChangedToggle();
                _previousActive = active;
            }
            
            if (!_previousColor.Equals(color))
            {
                ChangedColor();
                _previousColor = color;
            }
        }

        private void ChangedToggle()
        {
            if (active)
            {
                _material.EnableKeyword("_EMISSION");
            }
            else
            {
                _material.DisableKeyword("_EMISSION");
            }
        }
        
        private void ChangedColor()
        {
            _material.SetColor(EmissionColorNameID, color);
        }
    }
}