shader outline in csharp

To create a shader outline effect in C#, you can use a combination of rendering techniques and shaders. Here are the general steps to create a basic outline effect:

Render the object with the normal materials and shaders.
Create a second camera that only renders the outline of the object.
Use a custom "outline shader" on the second camera that detects edges and draws only the edges of the object in a contrasting color.
Combine the two renders, adjusting transparency if necessary, to create a final image with an outline effect.

Here's an example of a very basic outline shader in Unity:


main.cs
Shader "Custom/OutlineShader" {
    Properties {
        _MainTex ("Texture", 2D) = "white" {}
        _OutlineColor ("Outline Color", Color) = (0,0,0,1)
        _OutlineWidth ("Outline Width", Range(0.0, 0.1)) = 0.001
    }

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

        Pass {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            struct appdata {
                float3 vertex : POSITION;
            };

            struct v2f {
                float4 pos : SV_POSITION;
            };

            float _OutlineWidth;
            float4 _OutlineColor;

            v2f vert (appdata v) {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target {
                float depth = LinearEyeDepth(tex2D(_CameraDepthTexture, i.pos.xy));
                float4 depthPos = ComputeGrabScreenPos(i.pos.xy, depth);
                float4 col = tex2Dproj(_MainTex, UNITY_PROJ_COORD(depthPos));

                float4 outlineCol = tex2Dproj(_MainTex, UNITY_PROJ_COORD(depthPos + float4(0, _OutlineWidth, 0, 0)));
                outlineCol += tex2Dproj(_MainTex, UNITY_PROJ_COORD(depthPos + float4(0, -_OutlineWidth, 0, 0)));
                outlineCol += tex2Dproj(_MainTex, UNITY_PROJ_COORD(depthPos + float4(_OutlineWidth, 0, 0, 0)));
                outlineCol += tex2Dproj(_MainTex, UNITY_PROJ_COORD(depthPos + float4(-_OutlineWidth, 0, 0, 0)));
                outlineCol *= _OutlineColor;
                outlineCol /= 4;

                return lerp(col, outlineCol, col.a);
            }
            ENDCG
        }
    }
}
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To apply this shader to an object in Unity, you can create a new material using this shader and assign it to the object. You can then adjust the properties of the material to adjust the thickness and color of the outline.

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