diff --git a/src/base/differentiation.cpp b/src/base/differentiation.cpp
index b60fbd62..5d7c1388 100644
--- a/src/base/differentiation.cpp
+++ b/src/base/differentiation.cpp
@@ -464,7 +464,7 @@ void Differentiation::register_geometry_parameter(const CommandBuffer &command_b
     _counter_size = (_counter_size + length + 8u) & ~0b11u;
     _param_buffer_size = (_param_buffer_size + length + 8u) & ~0b11u;
     _gradient_buffer_size = (_gradient_buffer_size + length + 8u) & ~0b11u;
-    _geometry_params.emplace_back(param_index, instance_id, grad_offset, param_offset, counter_offset, buffer_view, length, 0u);
+    _geometry_params.emplace_back(param_index, instance_id, grad_offset, param_offset, counter_offset, buffer_view, length, 0u, mesh.resource);
 
     LUISA_INFO("buffer_view size is {}",buffer_view.size());
     LUISA_INFO("working here, {}, {}, {}, Mesh with {} triangles.", length, _counter_size, _param_buffer_size, mesh.resource->triangle_count());
@@ -483,7 +483,7 @@ void Differentiation::update_parameter_from_external(Stream &stream, luisa::vect
         stream << image.copy_from(textures[textures_id[i]]);
     }
 
-    LUISA_INFO("working on update paramaters");
+    LUISA_INFO("working on update paramaters {}",geoms_id.size());
     // apply geometry parameters
     for (auto i=0;i<geoms_id.size();i++) {
         auto &&p = _geometry_params[geoms_id[i]];
@@ -492,10 +492,13 @@ void Differentiation::update_parameter_from_external(Stream &stream, luisa::vect
         //auto [buffer_view, bindlessbuffer_id] = _pipeline.bindless_arena_buffer<Vertex>(buffer_id);
         auto length = buffer_view.size();
         LUISA_INFO("here length is {}, size is {}, as<vertex> size is {}",length,geoms[geoms_id[i]].view().size(),geoms[geoms_id[i]].view().as<Vertex>().size());
-        stream << buffer_view.copy_from(geoms[geoms_id[i]].view().as<Vertex>());
+        stream << buffer_view.copy_from(geoms[geoms_id[i]].view().as<Vertex>()) << synchronize() << p.mesh()->build() << synchronize();
         _is_dirty = true;
     }
-    stream << synchronize();
+    
+    //CommandBuffer command_buffer{&stream};
+    //pipeline().geometry()->build(command_buffer, _shapes, pipeline()._initial_time);
+    //stream << synchronize();
 }
  
 std::tuple<luisa::vector<void *>, luisa::vector<void *>> Differentiation::get_gradients(Stream &stream) {
diff --git a/src/base/differentiation.h b/src/base/differentiation.h
index 1a9413c9..0eba0086 100644
--- a/src/base/differentiation.h
+++ b/src/base/differentiation.h
@@ -68,11 +68,12 @@ class Differentiation {
         BufferView<Vertex> _buffer_view;
         uint _length;
         uint _buffer_id;
+        Mesh *_mesh;
     public:
         GeometryParameter(uint index, uint instance_id, uint grad_offset, uint param_offset,
-                          uint counter_offset, BufferView<Vertex> buffer_view, uint length, uint buffer_id) noexcept
+                          uint counter_offset, BufferView<Vertex> buffer_view, uint length, uint buffer_id, Mesh *mesh) noexcept
             : _index(index), _instance_id{instance_id}, _grad_offset{grad_offset}, _param_offset{param_offset},
-              _counter_offset{counter_offset}, _buffer_view{buffer_view}, _length(length), _buffer_id(buffer_id) {}
+              _counter_offset{counter_offset}, _buffer_view{buffer_view}, _length(length), _buffer_id(buffer_id), _mesh(mesh) {}
         [[nodiscard]] auto index() const noexcept { return _index; }
         [[nodiscard]] auto buffer() const noexcept { return _buffer_view; }
         [[nodiscard]] auto buffer_id() const noexcept { return _buffer_id; }
@@ -80,6 +81,7 @@ class Differentiation {
         [[nodiscard]] auto gradient_buffer_offset() const noexcept { return _grad_offset; }
         [[nodiscard]] auto param_offset() const noexcept { return _param_offset; }
         [[nodiscard]] auto counter_offset() const noexcept { return _counter_offset; }
+        [[nodiscard]] auto mesh() const noexcept { return _mesh; }
         [[nodiscard]] auto identifier() const noexcept { return luisa::format("diff_geom({})", _index); }
     };
 
@@ -142,6 +144,7 @@ class Differentiation {
 
     luisa::optional<BufferView<uint>> instance2offset;
 
+
 private:
     auto &pipeline() noexcept { return _pipeline; }
 
@@ -184,6 +187,7 @@ class Differentiation {
     void set_parameter(CommandBuffer &command_buffer, const GeometryParameter &param, BufferView<float> value) noexcept;
 
     std::tuple<luisa::vector<void*>,luisa::vector<void*>> get_gradients(Stream &stream);
+    luisa::span<const Shape *const> _shapes;
 };
 
 }// namespace luisa::render
diff --git a/src/base/geometry.cpp b/src/base/geometry.cpp
index aaeb8cbe..f383db67 100644
--- a/src/base/geometry.cpp
+++ b/src/base/geometry.cpp
@@ -48,6 +48,9 @@ void Geometry::_process_shape(
         }
         auto mesh = [&] {
             if (auto iter = _meshes.find(shape); iter != _meshes.end()) {
+                command_buffer << compute::commit()
+                               << iter->second.resource->build()
+                               << compute::commit();
                 return iter->second;
             }
             auto mesh_geom = [&] {
@@ -190,14 +193,14 @@ bool Geometry::update(CommandBuffer &command_buffer, float time) noexcept {
     if(_pipeline.differentiable())
     {
         if (_pipeline.differentiation()->is_dirty()) {
-            for (auto t : _pipeline.differentiation()->geometry_parameters()) {
-                _accel.set_prim_handle(t.instance_id(), (uint64_t)t.buffer().native_handle());
-            }
-            _pipeline.differentiation()->clear_dirty();
+            //for (auto t : _pipeline.differentiation()->geometry_parameters()) {
+            //    _accel.set_prim_handle(t.instance_id(), (uint64_t)t.buffer().native_handle());
+            //}
+            //_pipeline.differentiation()->clear_dirty();
+            LUISA_INFO("start build accel");
+            command_buffer << _accel.build() << synchronize();
+            LUISA_INFO("end build accel");
         }
-        LUISA_INFO("start build accel");
-        command_buffer << _accel.build() << synchronize();
-        LUISA_INFO("end build accel");
     }
     return updated;
 }
diff --git a/src/base/pipeline.cpp b/src/base/pipeline.cpp
index d68ecb55..4d5d752a 100644
--- a/src/base/pipeline.cpp
+++ b/src/base/pipeline.cpp
@@ -96,6 +96,7 @@ luisa::unique_ptr<Pipeline> Pipeline::create(Device &device, Stream &stream, con
         diff->register_optimizer(dynamic_cast<DifferentiableIntegrator::Instance *>(pipeline->_integrator.get())->optimizer());
         LUISA_INFO_WITH_LOCATION("middle _differentiation build.");
         diff->materialize(command_buffer);
+        diff->_shapes = scene.shapes();
     }
     LUISA_INFO_WITH_LOCATION("finish _differentiation build.");
     if (!pipeline->_transforms.empty()) {
diff --git a/src/base/pipeline.h b/src/base/pipeline.h
index 00ac3223..b2d57c17 100644
--- a/src/base/pipeline.h
+++ b/src/base/pipeline.h
@@ -97,10 +97,10 @@ class Pipeline {
     luisa::unordered_map<luisa::string, uint> _named_ids;
     // other things
     luisa::unique_ptr<Printer> _printer;
-    float _initial_time{};
     bool _any_dynamic_transforms{false};
 
 public:
+    float _initial_time{};
     // for internal use only; use Pipeline::create() instead
     explicit Pipeline(Device &device) noexcept;
     Pipeline(Pipeline &&) noexcept = delete;
diff --git a/src/tests/init.exr b/src/tests/init.exr
index 6f54c029..790cdfb3 100644
Binary files a/src/tests/init.exr and b/src/tests/init.exr differ