回答編集履歴
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Raw Imageでの真っ黒現象について追記
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**Raw Imageでの真っ黒現象について**
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Frame Debugで見てみたところ、下図のように一旦カラフルな紙吹雪が描画されるものの、後続の`ShadowCaster`パスのせいで真っ黒に塗り直されてしまっているようでした。
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UI用マテリアルに`ShadowCaster`パスは不要でしょうから、`ChromaKey_Unlit_Transparent.shader`を複製して`ChromaKey_UI_Transparent.shader`と名前を変え、下記のように`UI/Default`シェーダーをベースにUI向けの変更を加え...
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```ShaderLab
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// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
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Shader "ChromaKey/UI/Transparent"
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{
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Properties
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{
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[Header(Material)]
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_Color ("Color", Color) = (1, 1, 1, 1)
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_MainTex("Texture", 2D) = "white" {}
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[Enum(UnityEngine.Rendering.BlendMode)] _BlendSrc("Blend Src", Float) = 5
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[Enum(UnityEngine.Rendering.BlendMode)] _BlendDst("Blend Dst", Float) = 10
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[Header(Chroma Key)]
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_ChromaKeyColor("Color", Color) = (0.0, 0.0, 1.0, 0.0)
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_ChromaKeyHueRange("Hue Range", Range(0, 1)) = 0.1
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_ChromaKeySaturationRange("Saturation Range", Range(0, 1)) = 0.5
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_ChromaKeyBrightnessRange("Brightness Range", Range(0, 1)) = 0.5
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[Header(UI)]
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_StencilComp ("Stencil Comparison", Float) = 8
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_Stencil ("Stencil ID", Float) = 0
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_StencilOp ("Stencil Operation", Float) = 0
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_StencilWriteMask ("Stencil Write Mask", Float) = 255
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_StencilReadMask ("Stencil Read Mask", Float) = 255
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_ColorMask ("Color Mask", Float) = 15
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[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
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}
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SubShader
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{
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Tags
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{
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"Queue"="Transparent"
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"IgnoreProjector"="True"
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"RenderType"="Transparent"
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"PreviewType"="Plane"
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"CanUseSpriteAtlas"="True"
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}
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Stencil
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{
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Ref [_Stencil]
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Comp [_StencilComp]
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Pass [_StencilOp]
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ReadMask [_StencilReadMask]
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WriteMask [_StencilWriteMask]
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}
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Cull Off
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Lighting Off
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ZWrite Off
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ZTest [unity_GUIZTestMode]
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Blend [_BlendSrc] [_BlendDst]
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ColorMask [_ColorMask]
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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 2.0
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#include "UnityCG.cginc"
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#include "UnityUI.cginc"
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#include "./ChromaKey.cginc"
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#pragma multi_compile_local _ UNITY_UI_CLIP_RECT
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#pragma multi_compile_local _ UNITY_UI_ALPHACLIP
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struct appdata_t
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{
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float4 vertex : POSITION;
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float4 color : COLOR;
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float2 texcoord : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct v2f
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{
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float4 vertex : SV_POSITION;
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fixed4 color : COLOR;
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float2 texcoord : TEXCOORD0;
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float4 worldPosition : TEXCOORD1;
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UNITY_VERTEX_OUTPUT_STEREO
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};
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sampler2D _MainTex;
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fixed4 _Color;
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fixed4 _TextureSampleAdd;
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float4 _ClipRect;
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float4 _MainTex_ST;
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v2f vert(appdata_t v)
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{
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v2f OUT;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
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OUT.worldPosition = v.vertex;
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OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
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OUT.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
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OUT.color = v.color * _Color;
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return OUT;
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}
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fixed4 frag(v2f IN) : SV_Target
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{
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half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
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ChromaKeyApplyAlpha(color);
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#ifdef UNITY_UI_CLIP_RECT
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color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
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#endif
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#ifdef UNITY_UI_ALPHACLIP
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clip (color.a - 0.001);
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#endif
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return color;
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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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```
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VideoChromaKeyマテリアルのシェーダーをそれに変更すると、下図のようにカラフルな紙吹雪になりました。
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