add welcome menu

Assets/Scenes/_Shader/Ether.shader

@@ -37,10 +37,10 @@ Shader "FullScreen/Ether"
         float t = _Time.y * 0.2;
         p.xz = mul(m(t), p.xz);
         p.xy = mul(m(t), p.xy);
-        float3 q = p*_Wildness;
+        float3 q = p*_Wildness + t;
         return length(p +
-            float3(sin(t), sin(t), sin(t)))
-                *log(length(p)+_Zoom) + sin(q.x+sin(q.z+sin(q.y))) * spectrum.x;
+            float3(sin(t), sin(t), sin(-t)))
+                *log(length(p)+_Zoom) + sin(q.x+sin(q.z+sin(q.y))) * spectrum.x * sin(t);
     }
 
     float4 FullScreenPass(Varyings varyings) : SV_Target {