unity如何为着色器颜色添加发射？

Question

好吧，我下载了一个着色器（我不熟悉着色器），仅需要将Emission添加到其2种颜色之一：

Shader "Intersect"
{
    Properties
    {
        _MainTex("Field texture", 2D) = "white" {}
        _RegularColor("Field color", Color) = (1, 0, 0, .2)
        _HighlightColor("Intersect Color", Color) = (1, 0, 0, .8)
        _HighlightThresholdMax("Scan thickness", Float) = .1
        _ScanSpeed("Texture offset", Vector) = (1, 3, 0, 0)

    }

    Category
    {
        Tags { "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" }

        Blend One OneMinusSrcColor
        ColorMask RGB
        Cull Off Lighting Off ZWrite Off Fog{ Mode Off }

        SubShader
        {
            Pass
            {
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #pragma multi_compile_particles

                #include "UnityCG.cginc"

                sampler2D _MainTex;
                float4 _MainTex_ST;
                fixed4 _TintColor;
                fixed4 _ScanSpeed;
                uniform sampler2D _CameraDepthTexture; //Depth Texture
                uniform float4 _RegularColor;
                uniform float4 _HighlightColor;
                uniform float _HighlightThresholdMax;

                struct appdata_t
                {
                    float4 vertex : POSITION;
                    fixed4 color : COLOR;
                    float2 texcoord : TEXCOORD0;
                };

                struct v2f
                {
                    float4 vertex : SV_POSITION;
                    fixed4 color : COLOR;
                    float2 texcoord : TEXCOORD0;
                    float4 projPos : TEXCOORD1;
                };

                v2f vert(appdata_t v)
                {
                    v2f o;
                    o.vertex = UnityObjectToClipPos(v.vertex);
                    o.projPos = ComputeScreenPos(o.vertex);
                    o.color = v.color;
                    o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
                    return o;
                }

                half4 frag(v2f i) : COLOR
                {
                    float4 finalColor;

                    float sceneZ = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, UNITY_PROJ_COORD(i.projPos)));
                    float partZ = i.projPos.w;
                    float dist = sceneZ - partZ;
                    float mult = pow(1 - saturate(dist / _HighlightThresholdMax), 3);
                    fixed xScrollValue = _ScanSpeed.x * _Time.x;
                    fixed yScrollValue = _ScanSpeed.y * _Time.x;
                    half4 tex = tex2D(_MainTex, i.texcoord += half2(xScrollValue, yScrollValue));
                    finalColor = i.color * tex * _RegularColor;
                    finalColor.rgb *= finalColor.a;
                    _HighlightColor *= _HighlightColor.a;

                    return lerp(finalColor, _HighlightColor, mult);
                }

                ENDCG
            }
        }
    }
}

我需要向_HighlightColor添加发射-查看How to add emission to Unity custom shader?只是给了我错误。这可能吗？