diff --git a/Shaders/BoxClipTemplate.cginc b/Shaders/BoxClipTemplate.cginc
index 474a2f7..c5d9fc9 100644
--- a/Shaders/BoxClipTemplate.cginc
+++ b/Shaders/BoxClipTemplate.cginc
@@ -197,8 +197,14 @@ static float3 boxObjectSpaceCameraPosStereo = mul(unity_WorldToObject, float4(le
 static float3 boxObjectSpaceCameraPosStereo = boxObjectSpaceCameraPos;
 #endif
 
+bool boxConditionCheck(float3 origvertpos);
 void boxPreprocessVertex(inout float4 vert, inout float3 norm, inout float4 tang) {
     vert.xyz *= (BOXCLIP_SCALE > 0 ? BOXCLIP_SCALE : 1);
+#if defined(SHADER_API_MOBILE) || defined(SHADER_API_GLES30)
+    if (!boxConditionCheck(vert.xyz)) {
+        vert.xyz = sqrt(-vert.w);
+    }
+#endif
 }
 void boxPreprocessVertex(inout float4 vert, inout float3 norm) {
     float4 tangent = 0;
@@ -530,19 +536,27 @@ bool boxConditionCheck(float3 origvertpos) {
 }
 
 void boxConditionalClipLocal(float3 localPos) {
+#if !defined(SHADER_API_MOBILE) && !defined(SHADER_API_GLES30)
     clip(boxConditionCheck(localPos) ? 0 : -1);
+#endif
 }
 
 void boxConditionalClipLocal(float4 localPos) {
+#if !defined(SHADER_API_MOBILE) && !defined(SHADER_API_GLES30)
     clip(boxConditionCheck(localPos.xyz) ? 0 : -1);
+#endif
 }
 
 void boxConditionalClipWorld(float3 worldPos) {
+#if !defined(SHADER_API_MOBILE) && !defined(SHADER_API_GLES30)
     clip(boxConditionCheck(mul(unity_WorldToObject, float4(worldPos, 1)).xyz) ? 0 : -1);
+#endif
 }
 
 void boxConditionalClipWorld(float4 worldPos) {
+#if !defined(SHADER_API_MOBILE) && !defined(SHADER_API_GLES30)
     clip(boxConditionCheck(mul(unity_WorldToObject, worldPos).xyz) ? 0 : -1);
+#endif
 }
 
 bool geometry_check(float3 v1, float3 v2, float3 v3) {