Camera Fade Shader Stopped Working in LWRP (Solved)

Edit: Found solution. See next post.

I recently switched to the lwrp. My Camera fade-in/out shader has suddenly stopped working. Does anyone have any advice, or possibly a replacement that works with LWRP? I have included the shader and camera scripts.

Spoiler: FadeCameraShader

Code (CSharp):

1. // Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
2. // Taken from: https://github.com/iBicha/Unity-Simple-Fade-Camera
3. // http://brahim.hadriche.me/
4. // Author: Brahim Hadriche
5.  
6. Shader "Hidden/FadeCameraShader"
7. {
8.     Properties
9.     {
10.         _MainTex ("Texture", 2D) = "white" {}
11.         _opacity ("Opacity", Range (0, 1)) = 0
12.         _Color ("Fade Color", Color) = (0,0,0,1)
13.     }
14.  
15.     SubShader
16.     {
17.         // No culling or depth
18.         Cull Off ZWrite Off ZTest Always
19.  
20.         Pass
21.         {
22.             CGPROGRAM
23.             #pragma vertex vert
24.             #pragma fragment frag
25.          
26.             #include "UnityCG.cginc"
27.  
28.             struct appdata
29.             {
30.                 float4 vertex : POSITION;
31.                 float2 uv : TEXCOORD0;
32.             };
33.  
34.             struct v2f
35.             {
36.                 float2 uv : TEXCOORD0;
37.                 float4 vertex : SV_POSITION;
38.             };
39.  
40.             uniform sampler2D _MainTex;
41.             uniform float _opacity;
42.             uniform float4 _Color;
43.  
44.             v2f vert (appdata v)
45.             {
46.                 v2f o;
47.                 o.vertex = UnityObjectToClipPos(v.vertex);
48.                 o.uv = v.uv;
49.                 return o;
50.             }  
51.  
52.             fixed4 frag (v2f i) : SV_Target
53.             {
54.                 fixed4 col = tex2D(_MainTex, i.uv);
55.                 col = col * _opacity + _Color * (1-_opacity);
56.                 return col;
57.             }
58.             ENDCG
59.         }
60.     }
61. }

Spoiler: FadeCamera.cs

Code (CSharp):

1. using UnityEngine;
2.  
3. [ExecuteInEditMode]
4. // ReSharper disable once CheckNamespace
5. public class FadeCamera : MonoBehaviour
6. {
7.     [Range(0f, 1f)]
8.     public float opacity = 1;
9.     public Color color = Color.black;
10.  
11.     private Material _material;
12.     private float _startTime;
13.     private float _startOpacity = 1;
14.     private int _endOpacity = 1;
15.     private float _duration;
16.     private bool _isFading;
17.     private static readonly int Opacity = Shader.PropertyToID("_opacity");
18.  
19.     public void FadeIn(float duration = 1)
20.     {
21.         _duration = duration;
22.         _startTime = Time.time;
23.         _startOpacity = opacity;
24.         _endOpacity = 1;
25.         _isFading = true;
26.     }
27.  
28.     public void FadeOut(float duration = 1)
29.     {
30.         _duration = duration;
31.         _startTime = Time.time;
32.         _startOpacity = opacity;
33.         _endOpacity = 0;
34.         _isFading = true;
35.     }
36.  
37.     void Awake()
38.     {
39.         _material = new Material(Shader.Find("Hidden/FadeCameraShader"));
40.     }
41.  
42.     void Start()
43.     {
44.         FadeIn();
45.     }
46.  
47.     void OnRenderImage(RenderTexture source, RenderTexture destination)
48.     {
49.         if (_isFading && _duration > 0)
50.         {
51.             opacity = Mathf.Lerp(_startOpacity, _endOpacity, (Time.time - _startTime) / _duration);
52.             // ReSharper disable once CompareOfFloatsByEqualityOperator
53.             _isFading = opacity != _endOpacity;
54.         }
55.  
56.         // ReSharper disable once CompareOfFloatsByEqualityOperator
57.         if (opacity == 1f)
58.         {
59.             Graphics.Blit(source, destination);
60.             return;
61.         }
62.  
63.         _material.color = color;
64.         _material.SetFloat(Opacity, opacity);
65.         Graphics.Blit(source, destination, _material);
66.     }
67. }

 

Found a simple solution to this as a fullscreen image effect. The shader and effect scripts are below.

Spoiler: CameraFade.cs

Code (CSharp):

1. /*
2. * Camera Fade
3. * Image Effect by Dan Flanigan, djflan@gmail.com
4. * Written for Delve on 8/4/2019
5. */
6.  
7. using System;
8. using UnityEngine;
9. using UnityEngine.Rendering.PostProcessing;
10.  
11. [Serializable]
12. [PostProcess(typeof(CameraFadeRenderer), PostProcessEvent.AfterStack, "ImageFx/CameraFade")]
13. public sealed class CameraFade : PostProcessEffectSettings
14. {
15.     [Range(0f, 1f), Tooltip("Opacity Value. 0 = Full Transparency, 1 = Full Opacity")]
16.     public FloatParameter opacity = new FloatParameter { value = 0f };
17.     [Tooltip( "Fade Color")]
18.     public ColorParameter fadeColor = new ColorParameter {value = Color.black};
19. }
20.  
21. public sealed class CameraFadeRenderer : PostProcessEffectRenderer<CameraFade>
22. {
23.     public override void Render(PostProcessRenderContext context)
24.     {
25.         var sheet = context.propertySheets.Get(Shader.Find("Hidden/CameraFade"));
26.         sheet.properties.SetColor("_Color", settings.fadeColor);
27.         sheet.properties.SetFloat("_Opacity", settings.opacity);
28.         context.command.BlitFullscreenTriangle(context.source, context.destination, sheet, 0);
29.     }
30. }

Spoiler: CameraFade.shader

Code (CSharp):

1. /*
2. * Camera Fade Shader
3. * Image Effect by Dan Flanigan, djflan@gmail.com
4. * Written for Delve on 8/4/2019
5. */
6.  
7. Shader "Hidden/CameraFade"
8. {
9.     HLSLINCLUDE
10.  
11.         #include "Packages/com.unity.postprocessing/PostProcessing/Shaders/StdLib.hlsl"
12.  
13.         TEXTURE2D_SAMPLER2D(_MainTex, sampler_MainTex);
14.         float _Opacity;
15.         float4 _Color;
16.  
17.         float4 Frag(VaryingsDefault i) : SV_Target
18.         {
19.                 float4 col = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord);
20.                 col = col * _Opacity + _Color * (1-_Opacity);
21.                 return col;
22.         }
23.  
24.     ENDHLSL
25.  
26.     SubShader
27.     {
28.         Cull Off ZWrite Off ZTest Always
29.  
30.         Pass
31.         {
32.             HLSLPROGRAM
33.  
34.                 #pragma vertex VertDefault
35.                 #pragma fragment Frag
36.  
37.             ENDHLSL
38.         }
39.     }
40. }

Sample script controlling fade effect (on object that contains pp fx layer)

Spoiler: PostFxController.cs

Code (CSharp):

1. using DG.Tweening;
2. using UnityEngine;
3. using UnityEngine.Rendering.PostProcessing;
4.  
5. public class PostFxController : MonoBehaviour
6. {
7.     private PostProcessVolume effectsVolume;
8.     private CameraFade cf;
9.     public float fadeDuration = 1f;
10.  
11.     void Awake()
12.     {
13.         effectsVolume = GetComponent<PostProcessVolume>();
14.     }
15.  
16.     void Start()
17.     {
18.         if (effectsVolume != null)
19.         {
20.             if (effectsVolume.profile.TryGetSettings(out cf))
21.             {
22.                 cf.Opacity.value = 0f;
23.                
24.                 //Use DOTween to tween opacity value;
25.                 DOTween.To(() => cf.Opacity.value, x => cf.Opacity.value = x, 1f, fadeDuration).OnComplete(Finished);
26.             }
27.         }
28.     }
29.  
30.     void Finished()
31.     {
32.         //Disable fade and kill this script
33.         cf.enabled.value = false;
34.  
35.         DestroyImmediate(this);
36.     }
37. }