99 lines
3.0 KiB
Plaintext
99 lines
3.0 KiB
Plaintext
Shader "Custom/EmissiveLaser"
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{
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Properties
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{
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_MainTex ("Texture", 2D) = "white" {}
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[HDR]_Color ("Tint Color (HDR)", Color) = (1, 0, 0, 1)
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_Emission ("Emission Strength", Range(0, 20)) = 5.0
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_ScrollSpeed ("Scroll Speed", Float) = 1.0
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// Optional niceties for a neon line look:
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_CoreSharpness("Core Sharpness", Range(0.1, 8)) = 2.0 // higher = tighter core
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_EdgeSoftness ("Edge Softness", Range(0.0, 1.0)) = 0.35 // higher = wider glow band
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}
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SubShader
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{
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Tags { "Queue"="Transparent" "RenderType"="Transparent" }
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LOD 100
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// Additive neon
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Blend One One
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ZWrite Off
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Cull Off
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Lighting Off
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// Keep normal depth test so it can be occluded by geometry
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ZTest LEqual
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma target 3.0
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#include "UnityCG.cginc"
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#pragma multi_compile_fog
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sampler2D _MainTex;
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float4 _MainTex_ST;
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float4 _Color;
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float _Emission;
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float _ScrollSpeed;
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float _CoreSharpness;
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float _EdgeSoftness;
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct v2f
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{
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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UNITY_FOG_COORDS(1)
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};
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v2f vert (appdata v)
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{
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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// Scroll along U
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float2 uv = TRANSFORM_TEX(v.uv, _MainTex);
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uv.x += _Time.y * _ScrollSpeed;
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o.uv = uv;
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UNITY_TRANSFER_FOG(o, o.pos);
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return o;
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}
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fixed4 frag (v2f i) : SV_Target
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{
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// Base texture (use white if you just want a flat color)
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fixed4 tex = tex2D(_MainTex, i.uv);
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// Neon falloff across the width (LineRenderer typically uses V for width 0..1)
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// Center at 0.5; make a soft bell curve controlled by edge softness & sharpness.
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float v = abs(i.uv.y - 0.5) * 2.0; // 0 at center, 1 at edges
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float core = pow(saturate(1.0 - v / max(1e-4, _EdgeSoftness + 1e-4)), _CoreSharpness);
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// Clamp a little to avoid banding
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core = saturate(core);
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// HDR output: bright enough for Bloom to catch (Camera HDR must be ON)
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float3 rgb = tex.rgb * _Color.rgb * (_Emission);
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// Multiply by our soft core so edges fade nicely
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rgb *= core;
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// Additive blending ignores alpha, but keep it tidy
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return fixed4(rgb, tex.a * _Color.a);
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}
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ENDCG
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}
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}
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}
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