请帮我写一个，unity使用的shader，HDRP渲染管线，需要贴一张颜色贴图，并且使模型永远朝向摄像机

以下是一个Unity使用的Shader，基于HDRP渲染管线，需要贴一张颜色贴图，并且使模型永远朝向摄像机的示例：

Shader "Custom/AlwaysFaceCamera_HDRP" {
    Properties {
        _MainTex ("Texture", 2D) = "white" {}
    }
    SubShader {
        Tags {"Queue"="Transparent" "RenderType"="Transparent"}
        Pass {
            Name "MyPass"            
            HLSLPROGRAM
            #include "Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/Core.hlsl"
            #include "Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/Lighting.hlsl"
            #include "Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/PBR.hlsl"
            #pragma shader_feature_local _ALPHATEST_ON
            #pragma shader_feature_local _SURFACE_TYPE_TRANSPARENT

            Texture2D _MainTex;
            SamplerState _MainTex_sampler;

            struct a2v {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
                float3 normal : NORMAL;
            };

            struct v2f {
                float2 uv : TEXCOORD0;
                float3 worldNormal : TEXCOORD1;
                float3 worldPosition : TEXCOORD2;
                UNITY_FOG_COORDS(3)
                float4 vertex : SV_POSITION;
            };

            v2f vert (a2v v) {
                v2f o;
                o.vertex = TransformWorldToHClip(v.vertex);
                o.uv = v.uv;
                o.worldNormal = v.normal;
                o.worldPosition = mul(unity_ObjectToWorld, v.vertex).xyz;
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target {
                float4 color = tex2D(_MainTex_sampler, _MainTex, i.uv);
                float3 toCamera = normalize(_WorldSpaceCameraPos - i.worldPosition);
                float3 worldNormal = normalize(i.worldNormal);
                float3 forward = normalize(i.worldPosition - _WorldSpaceCameraPos);
                float3 right = normalize(cross(worldNormal, forward));
                float3 up = cross(forward, right);
                float3x3 rotationMatrix = float3x3(right, up, forward);
                float3 orientedDirection = mul(rotationMatrix, toCamera);
                float angle = atan2(orientedDirection.x, orientedDirection.z);
                float4 worldPos = mul(unity_ObjectToWorld, i.vertex);
                worldPos.y += angle * 100.0;
                return HDLitMaterial(color, 0, i.worldNormal, i.worldPosition, _WorldSpaceCameraPos, worldPos);
            }
            ENDHLSL
        }
    }
    FallBack "Transparent"
}

这个Shader使用了HDRP的LitMaterial函数来进行光照计算。它计算了从顶点到摄像机的方向，并计算了将模型旋转到面向摄像机所需的角度。最后，它通过在Y轴上移动顶点来实现模型始终面向摄像机的效果。

在这个示例中，它使用了一个颜色贴图来作为模型的纹理。你可以根据自己的需要修改这个Shader以实现不同的效果。