materials turn pink after changing render pipeline asset

(This material uses the standard unlit shader) How can I fix this, so I can use the Standard Shader from unity like before and my own which I created.

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The Built-In Render Pipeline and Scriptable Render Pipeline (URP/HDRP/Custom) are incompatible. This means you can not just mix and match different things from different pipelines. SRP fundamentally changed a lot of things. This is one of the reasons Unity is so persistent on pushing people to use ShaderGraph instead of writing custom HLSL as they keep changing it (only recently did URP get realtime support for shadows on point lights)

The only conceivable way to do what you want is to either

1) Redo your work in a single pipeline 2) Create your own customer shader that matches the Standard Shader (which is pretty hard as Unity keeps changing the names of stuff and there is not much to go on in therms of reference)

The problem that you will run into is that Unity has changed the names for various things in URP/HDRP so you are going to have to frankenstein a shader together if you want it to work.

URP Shader Template

https://gist.github.com/phi-lira/225cd7c5e8545be602dca4eb5ed111ba

Standard Unlit Shader

 Shader "Particles/Standard Unlit"
 {
     Properties
     {
         _MainTex("Albedo", 2D) = "white" {}
         _Color("Color", Color) = (1,1,1,1)

         _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

         _BumpScale("Scale", Float) = 1.0
         _BumpMap("Normal Map", 2D) = "bump" {}

         _EmissionColor("Color", Color) = (0,0,0)
         _EmissionMap("Emission", 2D) = "white" {}

         _DistortionStrength("Strength", Float) = 1.0
         _DistortionBlend("Blend", Range(0.0, 1.0)) = 0.5

         _SoftParticlesNearFadeDistance("Soft Particles Near Fade", Float) = 0.0
         _SoftParticlesFarFadeDistance("Soft Particles Far Fade", Float) = 1.0
         _CameraNearFadeDistance("Camera Near Fade", Float) = 1.0
         _CameraFarFadeDistance("Camera Far Fade", Float) = 2.0

         // Hidden properties
         [HideInInspector] _Mode ("__mode", Float) = 0.0
         [HideInInspector] _ColorMode ("__colormode", Float) = 0.0
         [HideInInspector] _FlipbookMode ("__flipbookmode", Float) = 0.0
         [HideInInspector] _LightingEnabled ("__lightingenabled", Float) = 0.0
         [HideInInspector] _DistortionEnabled ("__distortionenabled", Float) = 0.0
         [HideInInspector] _EmissionEnabled ("__emissionenabled", Float) = 0.0
         [HideInInspector] _BlendOp ("__blendop", Float) = 0.0
         [HideInInspector] _SrcBlend ("__src", Float) = 1.0
         [HideInInspector] _DstBlend ("__dst", Float) = 0.0
         [HideInInspector] _ZWrite ("__zw", Float) = 1.0
         [HideInInspector] _Cull ("__cull", Float) = 2.0
         [HideInInspector] _SoftParticlesEnabled ("__softparticlesenabled", Float) = 0.0
         [HideInInspector] _CameraFadingEnabled ("__camerafadingenabled", Float) = 0.0
         [HideInInspector] _SoftParticleFadeParams ("__softparticlefadeparams", Vector) = (0,0,0,0)
         [HideInInspector] _CameraFadeParams ("__camerafadeparams", Vector) = (0,0,0,0)
         [HideInInspector] _ColorAddSubDiff ("__coloraddsubdiff", Vector) = (0,0,0,0)
         [HideInInspector] _DistortionStrengthScaled ("__distortionstrengthscaled", Float) = 0.0
     }

     Category
     {
         SubShader
         {
             Tags { "RenderType"="Opaque" "IgnoreProjector"="True" "PreviewType"="Plane" "PerformanceChecks"="False" }

             BlendOp [_BlendOp]
             Blend [_SrcBlend] [_DstBlend]
             ZWrite [_ZWrite]
             Cull [_Cull]
             ColorMask RGB

             GrabPass
             {
                 Tags { "LightMode" = "Always" }
                 "_GrabTexture"
             }

             Pass
             {
                 Name "ShadowCaster"
                 Tags { "LightMode" = "ShadowCaster" }

                 BlendOp Add
                 Blend One Zero
                 ZWrite On
                 Cull Off

                 CGPROGRAM
                 #pragma target 2.5

                 #pragma shader_feature_local _ _ALPHATEST_ON _ALPHABLEND_ON _ALPHAPREMULTIPLY_ON _ALPHAMODULATE_ON
                 #pragma shader_feature_local _ _COLOROVERLAY_ON _COLORCOLOR_ON _COLORADDSUBDIFF_ON
                 #pragma shader_feature_local _REQUIRE_UV2
                 #pragma multi_compile_shadowcaster
                 #pragma multi_compile_instancing
                 #pragma instancing_options procedural:vertInstancingSetup

                 #pragma vertex vertParticleShadowCaster
                 #pragma fragment fragParticleShadowCaster

                 #include "UnityStandardParticleShadow.cginc"
                 ENDCG
             }

             Pass
             {
                 Name "SceneSelectionPass"
                 Tags { "LightMode" = "SceneSelectionPass" }

                 BlendOp Add
                 Blend One Zero
                 ZWrite On
                 Cull Off

                 CGPROGRAM
                 #pragma target 2.5

                 #pragma shader_feature_local _ALPHATEST_ON
                 #pragma shader_feature_local _REQUIRE_UV2
                 #pragma multi_compile_instancing
                 #pragma instancing_options procedural:vertInstancingSetup

                 #pragma vertex vertEditorPass
                 #pragma fragment fragSceneHighlightPass

                 #include "UnityStandardParticleEditor.cginc"
                 ENDCG
             }

             Pass
             {
                 Name "ScenePickingPass"
                 Tags{ "LightMode" = "Picking" }

                 BlendOp Add
                 Blend One Zero
                 ZWrite On
                 Cull Off

                 CGPROGRAM
                 #pragma target 2.5

                 #pragma shader_feature_local _ALPHATEST_ON
                 #pragma shader_feature_local _REQUIRE_UV2
                 #pragma multi_compile_instancing
                 #pragma instancing_options procedural:vertInstancingSetup

                 #pragma vertex vertEditorPass
                 #pragma fragment fragScenePickingPass

                 #include "UnityStandardParticleEditor.cginc"
                 ENDCG
             }

             Pass
             {
                 Tags { "LightMode"="ForwardBase" }

                 CGPROGRAM
                 #pragma multi_compile __ SOFTPARTICLES_ON
                 #pragma multi_compile_fog
                 #pragma target 2.5

                 #pragma shader_feature_local _ _ALPHATEST_ON _ALPHABLEND_ON _ALPHAPREMULTIPLY_ON _ALPHAMODULATE_ON
                 #pragma shader_feature_local _ _COLOROVERLAY_ON _COLORCOLOR_ON _COLORADDSUBDIFF_ON
                 #pragma shader_feature_local _NORMALMAP
                 #pragma shader_feature _EMISSION
                 #pragma shader_feature_local _FADING_ON
                 #pragma shader_feature_local _REQUIRE_UV2
                 #pragma shader_feature_local EFFECT_BUMP

                 #pragma vertex vertParticleUnlit
                 #pragma fragment fragParticleUnlit
                 #pragma multi_compile_instancing
                 #pragma instancing_options procedural:vertInstancingSetup

                 #include "UnityStandardParticles.cginc"
                 ENDCG
             }
         }
     }

     Fallback "VertexLit"
     CustomEditor "StandardParticlesShaderGUI"
 }

Hello guys. I just solved this problem with a friend and created a material with a shader based on the URP and added a texture to this material which comes close to the original particle system texture. Thanks for your help guys. This thread can be closed, if Threads are getting closed here.

@Aviryx I still want to know why my material, that works fine as a Unity Standard material, when I click on the menu option to convert it from Unity Standard to URP it then makes my material show only pink. Why is that? I thought Standard to URP/Lit was allowed so.... why is it doing that?

I got this when converting from standard to URP materials - all I had to do was:

1. Edit -> Render Pipeline -> Upgrade Materials...

2. Create (in Project tab) Rendering -> URP -> Pipeline Asset (Forward Renderer)

3. Project Settings -> Graphics -> Set 'Scriptable Render Pipeline Settings' to the settings created in 2

4. Project Settings -> Quality -> Do the same as 3 for the 'Rendering' settings.

Gradually the pink materials got sorted (clicking on them makes them refresh).