Shader "Unlit/DrawCircle"

{

Properties

{

_MainTex ("Texture", 2D) = "white" {}

_Radius("Radius", Range(0, 1)) = 0.15

_Thickness("Thickness", Range(0, 1)) = 0.02

_Angle("Angle", Range(0, 1)) = 0

}

SubShader

{

Tags { "Queue" = "Transparent" "IngnoreProjector" = "True" "RenderType" = "Transparent" }

LOD 200

Pass

{

ZWrite Off

Blend SrcAlpha OneMinusSrcAlpha

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 _Radius, _Thickness, _Angle;

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

{

// sample the texture

float alpha = 1.0f;

fixed4 col = tex2D(_MainTex, i.uv);

float dis = (i.uv.x - 0.5)*(i.uv.x - 0.5) + (i.uv.y - 0.5)*(i.uv.y - 0.5);

if (dis<_Radius ||dis>_Radius+ _Thickness)

{

col.a = 0.0;

clip(-1);

}

else {

float angletemp = atan2(i.uv.y - 0.5, i.uv.x - 0.5);

if (angletemp < (_Angle-0.5)*3.1415926*2)

{

col.a = 0.0;

clip(-1);

}

else {

col.a = (_Thickness*0.5 - abs(dis - _Radius - _Thickness * 0.5)) / 0.008;

}

}

// apply fog

//UNITY_APPLY_FOG(i.fogCoord, col);

return col;

}

ENDCG

}

}

}

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作者：unity游侠

链接：https://blog.csdn.net/y90o08u28/article/details/87272594

来源：CSDN
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