Add colour to shadowed particle shader

Assets/Scenes/Test C (3D).unity

@@ -291,7 +291,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: bdfe3008efbf29745879ab1d40574478, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  shader: {fileID: 4800000, guid: bebe529033c51cb4f99d667ea48fa0c7, type: 3}
+  shader: {fileID: 4800000, guid: 638bb1bdb9b8e374e8a5cbcd595e3973, type: 3}
   scale: 0.05
   col: {r: 0.27803493, g: 0.49487686, b: 0.8301887, a: 1}
   colourMap:
@@ -350,11 +350,11 @@ MonoBehaviour:
   m_EditorClassIdentifier: 
   numParticlesPerAxis: 35
   centre: {x: 0, y: -0.47, z: 0}
+  size: 3.7
   initialVel:
     x: 0
     y: 0
     z: 0
-  size: 3.7
   jitterStrength: 0.035
   showSpawnBounds: 1
   debug_numParticles: 42875

Assets/Scripts/Sim 3D/Display/Particle3DSurf.shader

@@ -0,0 +1,81 @@
+Shader "Instanced/Particle3DSurf" {
+	Properties{
+		_MainTex("Albedo (RGB)", 2D) = "white" {}
+		_Glossiness("Smoothness", Range(0,1)) = 0.5
+		_Metallic("Metallic", Range(0,1)) = 0.0
+	}
+		SubShader{
+			Tags { "RenderType" = "Opaque" }
+			LOD 200
+
+			CGPROGRAM
+			#pragma surface surf Standard addshadow fullforwardshadows vertex:vert
+			#pragma multi_compile_instancing
+			#pragma instancing_options procedural:setup
+
+			sampler2D _MainTex;
+
+			struct Input {
+				float2 uv_MainTex;
+				float4 colour;
+				float3 worldPos;
+			};
+
+
+		#ifdef UNITY_PROCEDURAL_INSTANCING_ENABLED
+			StructuredBuffer<float3> Positions;
+			StructuredBuffer<float3> Velocities;
+		#endif
+
+
+
+			SamplerState linear_clamp_sampler;
+			float velocityMax;
+
+			float scale;
+			float3 colour;
+
+			sampler2D ColourMap;
+
+			void vert(inout appdata_full v, out Input o)
+			{
+				UNITY_INITIALIZE_OUTPUT(Input, o);
+				o.uv_MainTex = v.texcoord.xy;
+
+	#ifdef UNITY_PROCEDURAL_INSTANCING_ENABLED
+				float speed = length(Velocities[unity_InstanceID]);
+				float speedT = saturate(speed / velocityMax);
+				float colT = speedT;
+				o.colour = tex2Dlod(ColourMap, float4(colT, 0.5,0,0));
+	#endif
+			}
+
+			void setup()
+			{
+			#ifdef UNITY_PROCEDURAL_INSTANCING_ENABLED
+				float3 pos = Positions[unity_InstanceID];
+
+				unity_ObjectToWorld._11_21_31_41 = float4(scale, 0, 0, 0);
+				unity_ObjectToWorld._12_22_32_42 = float4(0, scale, 0, 0);
+				unity_ObjectToWorld._13_23_33_43 = float4(0, 0, scale, 0);
+				unity_ObjectToWorld._14_24_34_44 = float4(pos, 1);
+				unity_WorldToObject = unity_ObjectToWorld;
+				unity_WorldToObject._14_24_34 *= -1;
+				unity_WorldToObject._11_22_33 = 1.0f / unity_WorldToObject._11_22_33;
+
+			#endif
+			}
+
+			half _Glossiness;
+			half _Metallic;
+
+			void surf(Input IN, inout SurfaceOutputStandard o) {
+				o.Albedo = IN.colour;
+				o.Metallic = 0;
+				o.Smoothness = 0;
+				o.Alpha = 1;
+			}
+			ENDCG
+		}
+			FallBack "Diffuse"
+}