回答編集履歴
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つなぎ目ブレンドに特化したバージョンを検討
answer
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@@ -118,4 +118,122 @@
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黄緑芝生の手前に緑芝生を配置し、緑芝生のマテリアルをその「Sprites/Gradient Alpha」を使ったものに差し替えたところ、下図のようになりました。
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#追記
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不透明にしたいエッジを選択する方式を検討してみました。同じくSprites-Default.shaderをベースに下記のように改造し...
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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 "Sprites/Edge Gradient Alpha"
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{
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Properties
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{
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[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
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_Color ("Tint", Color) = (1,1,1,1)
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[MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
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[HideInInspector] _RendererColor ("RendererColor", Color) = (1,1,1,1)
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[HideInInspector] _Flip ("Flip", Vector) = (1,1,1,1)
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[PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
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[PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0
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[Space]
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[Header(Gradient)]
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_GradientAlpha1 ("Alpha 1", Range(0, 1)) = 0
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_GradientAlpha2 ("Alpha 2", Range(0, 1)) = 1
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[PowerSlider(2.0)] _GradientExponent ("Exponent", Range(0.125, 8)) = 2
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[Toggle] _GradientEdgeTop ("Top", Float) = 0
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[Toggle] _GradientEdgeBottom ("Bottom", Float) = 0
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[Toggle] _GradientEdgeLeft ("Left", Float) = 0
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[Toggle] _GradientEdgeRight ("Right", 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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Cull Off
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Lighting Off
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ZWrite Off
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Blend One OneMinusSrcAlpha
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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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#pragma multi_compile_instancing
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#pragma multi_compile _ PIXELSNAP_ON
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#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
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#include "UnitySprites.cginc"
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float _GradientAlpha1;
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float _GradientAlpha2;
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float _GradientExponent;
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float _GradientEdgeTop;
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float _GradientEdgeBottom;
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float _GradientEdgeLeft;
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float _GradientEdgeRight;
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struct v2fCustom
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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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float2 position : TEXCOORD1; // グラデーション用の位置
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UNITY_VERTEX_OUTPUT_STEREO
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};
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v2fCustom vert(appdata_t IN)
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{
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v2fCustom OUT;
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UNITY_SETUP_INSTANCE_ID (IN);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
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OUT.vertex = UnityFlipSprite(IN.vertex, _Flip);
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OUT.vertex = UnityObjectToClipPos(OUT.vertex);
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OUT.texcoord = IN.texcoord;
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OUT.color = IN.color * _Color * _RendererColor;
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OUT.position = IN.vertex.xy * 2;
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#ifdef PIXELSNAP_ON
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OUT.vertex = UnityPixelSnap (OUT.vertex);
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#endif
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return OUT;
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}
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fixed4 frag(v2fCustom IN) : SV_Target
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{
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fixed4 c = SampleSpriteTexture (IN.texcoord) * IN.color;
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float alpha = saturate(dot(float4(
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pow(saturate(_GradientEdgeTop * IN.position.y), _GradientExponent),
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pow(saturate(_GradientEdgeBottom * -IN.position.y), _GradientExponent),
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pow(saturate(_GradientEdgeLeft * -IN.position.x), _GradientExponent),
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pow(saturate(_GradientEdgeRight * IN.position.x), _GradientExponent)), 1));
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c.a *= saturate(lerp(_GradientAlpha1, _GradientAlpha2, alpha));
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c.rgb *= c.a;
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return c;
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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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インスペクタ上で各チェックボックスを切り替えると、その方向のエッジ表示が切り替わります。
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