Question by Dvionst · Mar 13, 2018 at 11:08 AM · shader material graphics

Need help for adding border on dotted line shader

Hi, guys.. i got a script for dot line shader for making a trajectory like this example

[Example Video][1] [1]: https://www.facebook.com/Dvionst/videos/1941314302559254/

The problem is i want to make a black border around each circle and i'm new at shader things. Anyone can help me? Here is the script, in case anyone needed it too

 // Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
 
 Shader "Unlit/DottedLineShader"
 {
     Properties
     {
         _RepeatCount("Repeat Count", float) = 5
         _Spacing("Spacing", float) = 0.5
         _Offset("Offset", float) = 0
     }
         SubShader
     {
         Tags{ "RenderType" = "Transparent" "Queue" = "Transparent" }
         LOD 100
 
         Blend SrcAlpha OneMinusSrcAlpha
         ZWrite Off
 
         Pass
     {
         CGPROGRAM
 #pragma vertex vert
 #pragma fragment frag
 
 #include "UnityCG.cginc"
 
         float _RepeatCount;
     float _Spacing;
     float _Offset;
 
     struct appdata
     {
         float4 vertex : POSITION;
         float2 uv : TEXCOORD0;
         fixed4 color : COLOR0;
     };
 
     struct v2f
     {
         float2 uv : TEXCOORD0;
         float4 vertex : SV_POSITION;
         fixed4 color : COLOR0;
     };
 
     v2f vert(appdata v)
     {
         v2f o;
         o.vertex = UnityObjectToClipPos(v.vertex);
         o.uv = v.uv;
         o.uv.x = (o.uv.x + _Offset) * _RepeatCount * (1.0f + _Spacing);
         o.color = v.color;
 
         return o;
     }
 
     fixed4 frag(v2f i) : SV_Target
     {
         i.uv.x = fmod(i.uv.x, 1.0f + _Spacing);
     float r = length(i.uv - float2(1.0f + _Spacing, 1.0f) * 0.5f) * 2.0f;
 
     fixed4 color = i.color;
     color.a *= saturate((0.99f - r) * 100.0f);
 
     return color;
     }
         ENDCG
     }
     }
 }

Thank You very much

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