*

Unity/Assets/Materials/JoystickCircle.shader

@@ -0,0 +1,59 @@
+Shader "Custom/JoystickCircle" {
+Properties{
+    _Color ("Main Color", Color) = (1,1,1,1)
+    _Falloff ("Falloff", Float) = 0.025
+}
+SubShader {
+	Tags
+        {
+            "Queue" = "Transparent"
+            "IgnoreProjector" = "True"
+            "RenderType" = "Transparent"
+            "PreviewType"="Plane"
+        }
+	Pass {
+	 	Blend SrcAlpha OneMinusSrcAlpha
+	 	Cull Off
+        Lighting Off
+        ZWrite Off
+        ZTest Always
+        Fog { Mode Off }
+        
+		CGPROGRAM
+		#pragma vertex vert
+		#pragma fragment frag
+		#include "UnityCG.cginc"
+		
+		float _Falloff;
+		float4 _Color;
+
+		struct v2f {
+			float4 pos : SV_POSITION;
+			float3 color : COLOR0;
+			float2 uv : TEXCOORD0;
+		};
+
+		v2f vert (appdata_base v){
+			v2f o;
+			o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
+			o.color = v.normal * 0.5 + 0.5;
+			o.uv = v.texcoord.xy;
+			return o;
+		}
+
+		half4 frag (v2f i) : COLOR{
+			float radius = length(i.uv - 0.5f) * 2.0f;
+			//clip(1.0f - radius);
+			
+			float falloffRadius = 1.0f - clamp(radius, 1.0f - _Falloff, 1.0f);
+			
+			float falloff = pow(falloffRadius / _Falloff, 1.0f / 2);
+			
+			float3 color = falloff;
+			return half4 (_Color.rgb, _Color.a * falloff);
+		}
+		ENDCG
+	}
+}
+Fallback "VertexLit"
+}