Shader "QQ/Volume/Sphere"
{Properties{_Color("Color",Color) = (0.5,0.5,0.5,1)_Radius("radius",Range(0,1)) = 0.4_Smoothness("smoothness",Range(0.1,1)) = 0.5}SubShader{Tags { "RenderType" = "Opaque"}LOD 100Pass{Tags{"LightMode" = "ForwardBase"}CGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"uniform fixed4 _Color;uniform float _Radius;uniform float _Smoothness;uniform fixed4 _LightColor0;struct a2v{float4 vertex : POSITION;float3 normal : NORMAL;};struct v2f{float4 pos : SV_POSITION;float3 wPos:TEXCOORD0;float3 normal : TEXCOORD1;};v2f vert(a2v v){v2f o;o.pos = mul(UNITY_MATRIX_MVP, v.vertex);o.wPos = mul(unity_ObjectToWorld,v.vertex);o.normal = v.normal;return o;}inline float3 ToLocal(float3 pos){return mul(unity_WorldToObject, float4(pos, 1.0)).xyz;}fixed4 frag(v2f i) : SV_Target{fixed4 col;float3 pos = ToLocal(i.wPos);float3 nor = UnityObjectToWorldNormal(i.normal);float _i = length(pos) / _Radius;if (_i > 1){float3 camera = ToLocal(_WorldSpaceCameraPos.xyz);float3 dir = normalize(pos - camera);float len0 = distance(pos, camera);float len1 = length(camera) * dot(dir, normalize(-camera));if (len1 > len0){pos = dir * len1 + camera;_i = length(pos) / _Radius;float3 dir0 = normalize(pos);float3 dir1 = normalize(camera);nor = UnityObjectToWorldNormal(normalize(lerp(dir1, dir0, asin(_i) / UNITY_PI * 2)));}}if (_i <= 1){float3 wPos = mul(unity_ObjectToWorld, pos);float LdotN = max(dot(_WorldSpaceLightPos0.xyz, nor), 0);float3 Half = normalize(normalize(_WorldSpaceLightPos0.xyz) + normalize(_WorldSpaceCameraPos.xyz - wPos));float spec = pow(max(dot(nor, Half),0), _Smoothness * _Smoothness * 1000);col = _Color * fixed4(UNITY_LIGHTMODEL_AMBIENT.rgb, 1.0) + (LdotN + spec) * fixed4(_LightColor0.rgb,1.0);}else{discard;}return col;}ENDCG}}
}