diff --git a/zeno/src/nodes/mtl/ShaderAttrs.cpp b/zeno/src/nodes/mtl/ShaderAttrs.cpp
index 8b9caefdf3..e7698f805f 100644
--- a/zeno/src/nodes/mtl/ShaderAttrs.cpp
+++ b/zeno/src/nodes/mtl/ShaderAttrs.cpp
@@ -33,8 +33,8 @@ struct ShaderInputAttr : ShaderNodeClone<ShaderInputAttr> {
 
 ZENDEFNODE(ShaderInputAttr, {
     {
-        {"enum pos clr nrm uv tang bitang NoL LoV N T L V H reflectance fresnel instPos instNrm instUv instClr instTang prd.rndf() attrs.localPosLazy() attrs.uniformPosLazy() rayLength worldNrm worldTan worldBTn camFront camUp camRight", "attr", "pos"},
-        {"enum float vec2 vec3 vec4", "type", "vec3"},
+        {"enum pos clr nrm uv tang bitang NoL LoV N T L V H reflectance fresnel instPos instNrm instUv instClr instTang prd.rndf() attrs.localPosLazy() attrs.uniformPosLazy() rayLength isShadowRay worldNrm worldTan worldBTn camFront camUp camRight", "attr", "pos"},
+        {"enum float vec2 vec3 vec4 bool", "type", "vec3"},
     },
     {
         {"shader", "out"},
diff --git a/zenovis/xinxinoptix/CallableDefault.cu b/zenovis/xinxinoptix/CallableDefault.cu
index 088c05873b..7b6fc8c4f4 100644
--- a/zenovis/xinxinoptix/CallableDefault.cu
+++ b/zenovis/xinxinoptix/CallableDefault.cu
@@ -24,7 +24,7 @@ extern "C" __device__ MatOutput __direct_callable__evalmat(cudaTextureObject_t z
     auto att_instTang = attrs.instTang;
     auto att_rayLength = attrs.rayLength;
 
-
+    auto att_isShadowRay = attrs.isShadowRay ? 1.0f:0.0f;
 
     vec3 b = normalize(cross(attrs.T, attrs.N));
     vec3 t = normalize(cross(attrs.N, b));
diff --git a/zenovis/xinxinoptix/DeflMatShader.cu b/zenovis/xinxinoptix/DeflMatShader.cu
index 4750b192ca..14da41c4c9 100644
--- a/zenovis/xinxinoptix/DeflMatShader.cu
+++ b/zenovis/xinxinoptix/DeflMatShader.cu
@@ -157,6 +157,7 @@ extern "C" __global__ void __anyhit__shadow_cutout()
 #endif
 
     attrs.pos = attrs.pos + vec3(params.cam.eye);
+    attrs.isShadowRay = true;
     //MatOutput mats = evalMaterial(rt_data->textures, rt_data->uniforms, attrs);
     MatOutput mats = optixDirectCall<MatOutput, cudaTextureObject_t[], float4*, const MatInput&>( rt_data->dc_index, rt_data->textures, rt_data->uniforms, attrs );
 
@@ -438,6 +439,7 @@ extern "C" __global__ void __closesthit__radiance()
       attrs.T = attrs.tang;
     }
     attrs.V = -(ray_dir);
+    attrs.isShadowRay = false;
     //MatOutput mats = evalMaterial(rt_data->textures, rt_data->uniforms, attrs);
     MatOutput mats = optixDirectCall<MatOutput, cudaTextureObject_t[], float4*, const MatInput&>( rt_data->dc_index, rt_data->textures, rt_data->uniforms, attrs );
     prd->mask_value = mats.mask_value;
diff --git a/zenovis/xinxinoptix/IOMat.h b/zenovis/xinxinoptix/IOMat.h
index 89b427c415..116a5d9396 100644
--- a/zenovis/xinxinoptix/IOMat.h
+++ b/zenovis/xinxinoptix/IOMat.h
@@ -66,7 +66,10 @@ struct MatInput {
     vec3 instTang;
     float NoL;
     float LoV;
+    
     float rayLength;
+    bool isShadowRay;
+    
     vec3 reflectance;
     vec3 N;
     vec3 T;