// just a simple transparent color shader.
Shader "Custom/EasyColliderMeshColliderPreview" {
    Properties {
        _Color("Main Color", Color) = (1,1,1,1)
    }
    SubShader {
        Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
        Blend SrcAlpha OneMinusSrcAlpha
        Pass {
            CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #pragma target 2.0
    
                #include "UnityCG.cginc"
  
                struct appdata_t {
                    float4 vertex : POSITION;
                    float4 normal: NORMAL;
                };
    
                struct v2f {
                    float4 vertex : SV_POSITION;
                };
    
                half4 _Color;
    
                v2f vert (appdata_t v)
                {
                  v2f o;
                  //world space vert
                  o.vertex = mul(unity_ObjectToWorld, v.vertex);
                  // world space normal
                  float3 worldNormal = UnityObjectToWorldNormal(v.normal);
                  // offset by a small amount (1mm) (to prevent z-clipping)
                  o.vertex.xyz += worldNormal * 0.001f;
                  // back to to world space
                  o.vertex = mul(unity_WorldToObject, o.vertex);
                  // object to clip position
                  o.vertex = UnityObjectToClipPos(o.vertex);
                  return o;
                }
                    
                 
    
                fixed4 frag (v2f i) : SV_Target
                {
                  // all mesh-collider previews have an alpha value that can be changed if you wish.
                  _Color.a = 0.8f;
                  return _Color;
                }
            ENDCG
            
        }
    }
 }