diff --git a/Res/Shader/volume.hlsl b/Res/Shader/volume.hlsl
index 82b618a2..30ef62ea 100644
--- a/Res/Shader/volume.hlsl
+++ b/Res/Shader/volume.hlsl
@@ -112,12 +112,8 @@ float4 MainPS(PSInput input) : SV_TARGET
 {
     float3 rayDir = normalize(input.worldPos - _CameraPos);
     
-    float tmin, tmax;
-    if (!intersectBox(_CameraPos, rayDir, _BBoxMin, _BBoxMax, tmin, tmax)) {
-        return float4(0, 0, 0, 0);
-    }
-    
-    tmin = max(0, tmin);
+    float tmin = 0.1;
+    float tmax = 1000.0;
     
     NanoVolume volume;
     initVolume(volume);