Shader "Custom/MeshShadow"

{

    Properties

    {

        _ShadowOffset("ShadowOffset",vector) = (,,,)

        _ShadowHeight("ShadowHeight",float) =

    }

    SubShader

    {

        Tags { "RenderType"="Opaque"  "Queue"="Transparent"}

        Pass

        {

            Name "MeshShadow"

            Tags {"LightMode" = "Always"}

            Blend One OneMinusSrcAlpha

            ZWrite Off

            ZTest Always

            Stencil

            {

                Ref

                Comp NotEqual

                Pass Replace

            }

            CGPROGRAM

            #include "UnityCG.cginc"

            #pragma vertex vert

            #pragma fragment frag 

            float4 _ShadowOffset;

            float _ShadowHeight;

            struct v2f

            {

                float4 pos : POSITION;

                float4 texcoord : TEXCOORD0;

            };

            v2f vert ( appdata_base v )

            {

                v2f o;

                float4x4 _RotMatrix = _Object2World;

                _RotMatrix[][] = ;

                _RotMatrix[][] = ;

                _RotMatrix[][] = ;

                float3 tempPos = float3(_Object2World[][],_Object2World[][],_Object2World[][]);

                float4 vertexPos = mul(_RotMatrix,v.vertex);

                vertexPos.x += _ShadowOffset.x * vertexPos.y + _ShadowOffset.x;

                vertexPos.z += _ShadowOffset.y * vertexPos.y + _ShadowOffset.y;

                vertexPos.xyz += tempPos;

                vertexPos.y = _ShadowHeight;

                o.pos = mul(UNITY_MATRIX_VP, vertexPos);

                o.texcoord = v.texcoord;

                return o;

            }

            fixed4 frag(v2f i) :COLOR

            {

                return fixed4(,,,0.3);

            }

            ENDCG

        }

    } 

}