Help... Surface Cutout shader not displaying alpha correctly with shadows

Graphics Shaders & Materials
1

Hey there, hope anyone can help… Ive written this surface shader to give my trees some movement and I thought creating a cutout shader would be simple enough however I’m getting a really weird issue which I know has something to do with shadowcaster and the way I’m using it but I’m stump at how to move forwards.

This is the shader:

Shader "Nature/FoliageMovement" {
    Properties {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness("Smoothness", Range(0,1)) = 0.5
        _Metallic("Metallic", Range(0,1)) = 0.0
        _Speed("Speed",float) = 50
        _Offset("Offset",vector) = (0,0,0,0)
        _CutOff("CutOff", float) = 1
    }
        SubShader{
            Tags
        {
            "IgnoreProjector" = "True"
            "Queue" = "AlphaTest"
            "RenderType" = "TransparentCutout"
             "LightMode" = "ShadowCaster"
        }
            LOD 200
            Cull Off
       
        CGPROGRAM
        // Physically based Standard lighting model, and enable shadows on all light types
        #pragma surface surf Standard fullforwardshadows vertex:vert alphatest:_CutOff
        // Use shader model 3.0 target, to get nicer looking lighting
        #pragma target 3.0

        sampler2D _MainTex;
        float _Speed;
        float4 _Offset;

        struct Input {
            float2 uv_MainTex;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;

        void vert (inout appdata_full v)
        {

                _Offset = fixed4(clamp(_Offset.x,-0.25, 0.25)/100, _Offset.y/100, clamp(_Offset.z,-0.25, 0.25)/100,_Offset.w/100);

                //Top
                v.vertex.x  += v.color.g * sin(_Time * _Speed) * _Offset.x;
                v.vertex.z += v.color.g * sin(_Time * _Speed) * _Offset.z;
                //Base
                v.vertex.x += v.color.r * 0;
                v.vertex.z += v.color.r * 0;
                v.vertex.y += v.color.r * 0;
                v.vertex.w += v.color.r * 0;

                v.vertex.y += (v.color.g * sin(_Time *  _Speed)* mul(unity_WorldToObject, v.vertex)*_Offset.y);
                float bounce = v.color.g * sin(_Time * _Speed) *_Offset.w;
                v.vertex.y += bounce;

                }

        void surf (Input IN, inout SurfaceOutputStandard o) {
            // Albedo comes from a texture tinted by color
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            // Metallic and smoothness come from slider variables
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Transparent/Cutout/Diffuse"
}

The is what I’m seeing in editor2941693--217719--Alpha Problem.jpg

But weirdly by selecting the model I get the desired result however this is only temporary and doesn’t show in a build :frowning:2941693--217720--DesiredResult.jpg

Any help would be greatly appreciated and thanks in advance :slight_smile:

2

Okay so something strange is happening, I have rewritten it again because I cant think what else to do, and this time it no longer does the above issue. Instead I just get a slight ghosting now, does anyone know why this happens and how to eliminate it?

2941758--217726--Ghosting.jpg
2941758--217726--Ghosting.jpg696×464 110 KB

As said really not sure why this script now works over the other one but here it is anyways.

 Shader "Nature/FoliageMovement" {
     Properties {
         _Color ("Color", Color) = (1,1,1,1)
         _Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
         _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
         _Glossiness("Smoothness", Range(0,1)) = 0.5
         _Metallic("Metallic", Range(0,1)) = 0.0
         _Speed("Speed",float) = 50
         _Offset("Offset",vector) = (0,0,0,0)
     }
     SubShader {
         Tags { "Queue"="AlphaTest" "RenderType"="TransparentCutout"  "LightMode" = "ShadowCaster"}
         LOD 200
         Cull Off
       
         CGPROGRAM      
         #pragma surface surf Standard fullforwardshadows alphatest:_Cutoff vertex:vert
               
         #pragma target 3.0
         sampler2D _MainTex;
         sampler2D _DetailTex;      
         float _Speed;
         float4 _Offset;
         half _Glossiness;
         half _Metallic;
         struct Input {
             float2 uv_MainTex;
         };

         void vert (inout appdata_full v)
        {

                _Offset = fixed4(clamp(_Offset.x,-0.25, 0.25)/100, _Offset.y/100, clamp(_Offset.z,-0.25, 0.25)/100,_Offset.w/100);

                //Top
                v.vertex.x  += v.color.g * sin(_Time * _Speed) * _Offset.x;
                v.vertex.z += v.color.g * sin(_Time * _Speed) * _Offset.z;
                //Base
                v.vertex.x += v.color.r * 0;
                v.vertex.z += v.color.r * 0;
                v.vertex.y += v.color.r * 0;
                v.vertex.w += v.color.r * 0;

                v.vertex.y += (v.color.g * sin(_Time *  _Speed)* mul(unity_WorldToObject, v.vertex)*_Offset.y);
                float bounce = v.color.g * sin(_Time * _Speed) *_Offset.w;
                v.vertex.y += bounce;

                }
         void surf (Input IN, inout SurfaceOutputStandard o) {          
             fixed4 c = tex2D (_MainTex, IN.uv_MainTex);
             o.Albedo = c.rgb;
             o.Alpha = c.a;
             // Metallic and smoothness come from slider variables
             o.Metallic = _Metallic;
             o.Smoothness = _Glossiness;
         }
         ENDCG
     }
     FallBack "Transparent/Cutout/Diffuse"
}

Thanks again.