diff --git a/Packages/com.unity.render-pipelines.universal@14.0.11/ShaderLibrary/CapsuleShadow.hlsl b/Packages/com.unity.render-pipelines.universal@14.0.11/ShaderLibrary/CapsuleShadow.hlsl
index 1992787..94b0714 100644
--- a/Packages/com.unity.render-pipelines.universal@14.0.11/ShaderLibrary/CapsuleShadow.hlsl
+++ b/Packages/com.unity.render-pipelines.universal@14.0.11/ShaderLibrary/CapsuleShadow.hlsl
@@ -197,6 +197,38 @@ float CalcSphereOcclusion2(in float3 pos, in float3 nor, in float4 sph)
     //    float sqL = dot(di, di);
     //    return clamp(1.0 - dot(nor, di) * rsqrt(sqL * sqL * sqL), 0.1, 1);
 }
+
+float sphOcclusion( in float3 pos, in float3 nor, in float4 sph )
+{
+    float3  di = sph.xyz - pos;
+    float l  = length(di);
+    float nl = dot(nor,di/l) * _CapsuleShadowData[0].ConeAngle;
+    float h  = l/sph.w;
+    float h2 = h*h;
+    float k2 = 1.0 - h2*nl*nl;
+
+    // above/below horizon
+    // EXACT: Quilez - https://iquilezles.org/articles/sphereao
+    float res = max(0.0,nl)/h2;
+    
+    // intersecting horizon 
+    if( k2 > 0.001 ) 
+    {
+        #if 0
+        // EXACT : Lagarde/de Rousiers - https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
+        res = nl*acos(-nl*sqrt( (h2-1.0)/(1.0-nl*nl) )) - sqrt(k2*(h2-1.0));
+        res = res/h2 + atan( sqrt(k2/(h2-1.0)));
+        res /= 3.141593;
+        #else
+        // APPROXIMATED : Quilez - https://iquilezles.org/articles/sphereao
+        res = (nl*h+1.0)/h2;
+        res = 0.33*res*res;
+        #endif
+    }
+
+    return 1 -res;
+}
+
 float CalcCapsuleOcclusionByIndexV2(float3 p, float3 n, uint s, uint e, float intensity, float intensity1)
 {
     float ao = 1.0;
@@ -209,7 +241,7 @@ float CalcCapsuleOcclusionByIndexV2(float3 p, float3 n, uint s, uint e, float in
         // p 在 ba 上投影长度与 ba 长度比值
         float t = /* abs(l) < 1e-8f ? 0.0 : */ saturate(dot(pa, ba) / l);
         float3 positionToRay = capsule.a + t * ba;
-        ao *= CalcSphereOcclusion2(p, n, float4(positionToRay, capsule.radius));
+        ao *= sphOcclusion(p, n, float4(positionToRay, capsule.radius));
     }
     ao = saturate(lerp(1, ao, intensity));
     return saturate(lerp(1, ao, intensity1));
@@ -264,8 +296,8 @@ void CalcCapsuleShadow(float3 worldPos, float3 worldNormal, out  float shadow, o
                         shadow = min(shadow, tempShadow);
                     }
                 }
-                occlusion *= CalcCapsuleOcclusionByIndex(worldPos, worldNormal, c.capsuleStartID, c.capsuleEndID, intensity, _CapsuleShadowData[0].AmbientIntensity);
-                //occlusion *= CalcCapsuleOcclusionByIndexV2(worldPos, worldNormal, c.capsuleStartID, c.capsuleEndID, intensity, _CapsuleShadowData[0].AmbientIntensity);
+               // occlusion *= CalcCapsuleOcclusionByIndex(worldPos, worldNormal, c.capsuleStartID, c.capsuleEndID, intensity, _CapsuleShadowData[0].AmbientIntensity);
+                occlusion *= CalcCapsuleOcclusionByIndexV2(worldPos, worldNormal, c.capsuleStartID, c.capsuleEndID, intensity, _CapsuleShadowData[0].AmbientIntensity);
             #elif defined(_MultiCapsule_AO_ON)
                 occlusion *= CalcCapsuleOcclusionByIndex(worldPos, worldNormal, c.capsuleStartID, c.capsuleEndID, intensity, _CapsuleShadowData[0].AmbientIntensity);
             #endif