docs: replaced mock image with dummy shader

JotunnLib/Documentation/tutorials/asset-mocking.md

@@ -53,6 +53,57 @@ The only special case is shader mocking for custom materials.
 The asset name isn't their object name, which means that renaming it will not result in a valid mock.
 
 Instead, create a new stump shader or use the dummy shader from AssetRipper and change the first line to contain the `JVLmock_` prefix.
+If you don't have dummy shaders but yaml shaders, set AssetRipper to export dummy shaders instead and make a second rip to copy them over.
 Now you can use this shader as normally on your materials and Jötunn will resolve the right Shader for you.
-
-![mocks assigned](../images/data/shader_mock_edit.png)
+Properties that are set on the material will be used by the resolved shader.
+
+This is a mock for the piece shader as an example:
+
+```shaderlab
+Shader "JVLmock_Custom/Piece" {
+	Properties {
+		_Color ("Color", Vector) = (1,1,1,1)
+		_Cutoff ("Alpha Cutoff", Range(0, 1)) = 0
+		_MainTex ("Albedo (RGB)", 2D) = "white" {}
+		_MetallicTex ("Metallic", 2D) = "white" {}
+		_Metallic ("Metallic", Range(0, 1)) = 0
+		_MetallicAlphaGloss ("Metal smoothness", Range(0, 1)) = 0
+		[HDR] _MetalColor ("Metal color", Vector) = (1,1,1,1)
+		_BumpMap ("Normal Map", 2D) = "bump" {}
+		_BumpScale ("Normal intensity", Float) = 1
+		_Glossiness ("Smoothness", Range(0, 1)) = 0.5
+		_EmissionColor ("Emissive", Vector) = (0,0,0,0)
+		_RippleDistance ("Noise distance", Float) = 0
+		_RippleFreq ("Noise freq", Float) = 1
+		_ValueNoise ("ValueNoise", Float) = 0.5
+		[MaterialToggle] _ValueNoiseVertex ("Value noise per vertex", Float) = 0
+		[MaterialToggle] _TwoSidedNormals ("Twosided normals", Float) = 0
+		[Enum(Off,0,Back,2)] _Cull ("Cull", Float) = 2
+		[MaterialToggle] _AddRain ("Add Rain", Float) = 1
+		_NoiseTex ("Noise", 2D) = "white" {}
+	}
+	//DummyShaderTextExporter
+	SubShader{
+		Tags { "RenderType"="Opaque" }
+		LOD 200
+		CGPROGRAM
+#pragma surface surf Standard
+#pragma target 3.0
+
+		sampler2D _MainTex;
+		fixed4 _Color;
+		struct Input
+		{
+			float2 uv_MainTex;
+		};
+		
+		void surf(Input IN, inout SurfaceOutputStandard o)
+		{
+			fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
+			o.Albedo = c.rgb;
+			o.Alpha = c.a;
+		}
+		ENDCG
+	}
+}
+```