■ 極座標シェーダー実験メモ 
https://twitter.com/Cyanilux/status/1123944969125998592
Shader "Unlit/PolarCorrdinates" { Properties { _MainTex ("Texture", 2D) = "white" {} _Rotate("Rotate", Float) = 0.0 _RotateSpeed("RotateSpeed", Float) = 0.0 _RadiusAdd("RadiusAdd", Float) = 0.0 _RadiusSpeed("RadiusSpeed", Float) = 0.0 } SubShader { Tags { "RenderType"="Opaque" } LOD 100 Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag // make fog work #pragma multi_compile_fog #include "UnityCG.cginc" struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; }; struct v2f { float2 uv : TEXCOORD0; UNITY_FOG_COORDS(1) float4 vertex : SV_POSITION; }; sampler2D _MainTex; float4 _MainTex_ST; float _Rotate; float _RotateSpeed; float _RadiusAdd; float _RadiusSpeed; v2f vert (appdata v) { v2f o; o.vertex = UnityObjectToClipPos(v.vertex); o.uv = TRANSFORM_TEX(v.uv, _MainTex); UNITY_TRANSFER_FOG(o,o.vertex); return o; } fixed4 frag (v2f i) : SV_Target { float2 uv = (i.uv * 2.0f) - float2(1,1); float r = 1.0 - length(uv); float theta = atan2(uv.y, uv.x)*(1.0f / (3.1415926535f*2.0f)); r = pow(r+0.9, 2.0); float2 puv; puv.x = r + _RadiusAdd + _RadiusSpeed * _Time.x; puv.y = r + theta + _Rotate + _RotateSpeed * _Time.x; // sample the texture fixed4 col = tex2D(_MainTex, puv); // apply fog UNITY_APPLY_FOG(i.fogCoord, col); return col; } ENDCG } } }
