Shader "Custom/CharacterTest"
{
    Properties
    {
        _Direction ("Direction", Vector) = (0, 1, 0, 0)
        _Intensity ("Intensity", Range(0.0, 1.0)) = 0.5
        _MainTex ("Texture", 2D) = "white" {}
    }

    SubShader
    {
        Tags
        {
            "Queue"="Transparent" "RenderType"="Transparent"
        }
        LOD 100
        Cull Off
        ZWrite On

        CGPROGRAM
        #pragma surface surf Lambert

        sampler2D _MainTex;
        float4 _Direction;
        float _Intensity;

        struct Input
        {
            float2 uv_MainTex;
        };

        void surf(Input IN, inout SurfaceOutput o)
        {
            float2 center = float2(0.5, 0.5);
            float2 dir = normalize(_Direction.xy) * _Intensity;

            // Stretch the texture along the given direction vector
            float stretch = dot(IN.uv_MainTex - center, _Direction.xy) * _Intensity;
            float2 stretchedUV = (IN.uv_MainTex - center) * float2(stretch, 1.0) + center;

            fixed4 col = tex2D(_MainTex, stretchedUV);
            if (col.a == 0)
            {
                discard;
            }
            o.Albedo = col.rgb;
            o.Alpha = col.a;
        }
        ENDCG
    }

    FallBack "Diffuse"
}