HoHCI-BikeSim/Assets/Scripts/SicknessReduction/Visual/DoF/DynamicDoF.cs

using System;
using System.Linq;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

namespace SicknessReduction.Visual.DoF
{
    public class DynamicDoF : MonoBehaviour
    {
        public Camera playerCamera;
        public VolumeProfile postProcessProfile;
        
        private Transform cameraTransform;
        private DepthOfField doF;
        private bool doFAvailable;

        private void Start()
        {
            cameraTransform = playerCamera.transform;
            doF = (DepthOfField) postProcessProfile.components.FirstOrDefault(c => c is DepthOfField);
            doFAvailable = doF != null;
            if (doFAvailable)
            {
                // ReSharper disable once PossibleNullReferenceException
                doF.mode.value = DepthOfFieldMode.Bokeh;
            }
            else
            {
                Debug.LogWarning("No DepthOfField found in PostProcessing Profile!");
            }
           
        }

        private void Update()
        {
            if(!doFAvailable) return;
            var focalDistance = CastRay();
            if (focalDistance < 0)
            {
                doF.active = false;
                return;
            }

            doF.active = true;
            doF.focusDistance.value = focalDistance;
            doF.focalLength.value = focalDistance * 10;
        }

        private float CastRay()
        {
            var position = cameraTransform.position;
            var forward = cameraTransform.forward;
            var start = position + forward * playerCamera.nearClipPlane;
            var end = position + forward * playerCamera.farClipPlane;

            if (Physics.Linecast(start, end, out var hit, Physics.DefaultRaycastLayers))
            {
                Debug.DrawLine(start, end, Color.green);
                Debug.Log("DoF - Hit, Distance = "+hit.distance);
                return hit.distance;
            }

            Debug.DrawRay(position, position + forward * playerCamera.farClipPlane, Color.red);
            Debug.Log("DoF - No hit");
            return -1f;

        }
    }
}