diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index f1fb57d..6312581 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -3,6 +3,7 @@ find_package(PROJ CONFIG REQUIRED)
 
 add_library(geopro_core STATIC
   geo/LocalFrame.cpp
+  geo/GeoLocalFrame.cpp
   geo/CrsTransform.cpp
   model/ColorScale.cpp
   algo/IdwInterpolator.cpp
diff --git a/src/core/geo/GeoLocalFrame.cpp b/src/core/geo/GeoLocalFrame.cpp
new file mode 100644
index 0000000..18d3ec8
--- /dev/null
+++ b/src/core/geo/GeoLocalFrame.cpp
@@ -0,0 +1,24 @@
+#include "geo/GeoLocalFrame.hpp"
+
+#include <cmath>
+
+namespace geopro::core {
+
+namespace {
+constexpr double kPi = 3.14159265358979323846;
+// 纬度每度约 110540 m（近似常数）；经度每度随纬度收缩 111320*cos(lat)。
+constexpr double kMetersPerDegLat = 110540.0;
+constexpr double kMetersPerDegLonEquator = 111320.0;
+}  // namespace
+
+GeoLocalFrame::GeoLocalFrame(double lat0, double lon0)
+    : lat0_(lat0),
+      lon0_(lon0),
+      mPerDegLon_(kMetersPerDegLonEquator * std::cos(lat0 * kPi / 180.0)),
+      mPerDegLat_(kMetersPerDegLat) {}
+
+LocalXY GeoLocalFrame::toLocal(double lat, double lon) const {
+    return LocalXY{(lon - lon0_) * mPerDegLon_, (lat - lat0_) * mPerDegLat_};
+}
+
+}  // namespace geopro::core
diff --git a/src/core/geo/GeoLocalFrame.hpp b/src/core/geo/GeoLocalFrame.hpp
new file mode 100644
index 0000000..e401352
--- /dev/null
+++ b/src/core/geo/GeoLocalFrame.hpp
@@ -0,0 +1,16 @@
+#pragma once
+namespace geopro::core {
+
+struct LocalXY { double x, y; };
+
+// 等距圆柱(equirectangular)近似：把经纬度投到以(lat0,lon0)为原点的局部米平面。
+// 小范围测区足够；x=East、y=North(米)。
+class GeoLocalFrame {
+public:
+    GeoLocalFrame(double lat0, double lon0);
+    LocalXY toLocal(double lat, double lon) const;  // -> (x East m, y North m)
+private:
+    double lat0_, lon0_, mPerDegLon_, mPerDegLat_;
+};
+
+}  // namespace geopro::core
diff --git a/src/render/CMakeLists.txt b/src/render/CMakeLists.txt
index 4662654..d6e9813 100644
--- a/src/render/CMakeLists.txt
+++ b/src/render/CMakeLists.txt
@@ -1,6 +1,6 @@
-find_package(VTK REQUIRED COMPONENTS CommonCore CommonDataModel FiltersGeometry FiltersModeling RenderingOpenGL2 RenderingVolumeOpenGL2 InteractionStyle InteractionWidgets)
+find_package(VTK REQUIRED COMPONENTS CommonCore CommonDataModel FiltersGeometry FiltersModeling RenderingCore RenderingOpenGL2 RenderingVolumeOpenGL2 InteractionStyle InteractionWidgets)
 add_library(geopro_render STATIC
-  Scene.cpp ColorLutBuilder.cpp CameraPreset.cpp actors/GridContourActor.cpp actors/VoxelActor.cpp)
+  Scene.cpp ColorLutBuilder.cpp CameraPreset.cpp actors/GridContourActor.cpp actors/VoxelActor.cpp actors/CurtainActor.cpp)
 target_include_directories(geopro_render PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(geopro_render PUBLIC geopro_core ${VTK_LIBRARIES})
 target_compile_features(geopro_render PUBLIC cxx_std_17)
diff --git a/src/render/actors/CurtainActor.cpp b/src/render/actors/CurtainActor.cpp
new file mode 100644
index 0000000..7d818ac
--- /dev/null
+++ b/src/render/actors/CurtainActor.cpp
@@ -0,0 +1,93 @@
+#include "actors/CurtainActor.hpp"
+
+#include <vtkDataSetMapper.h>
+#include <vtkDoubleArray.h>
+#include <vtkNew.h>
+#include <vtkPointData.h>
+#include <vtkPoints.h>
+#include <vtkStructuredGrid.h>
+
+#include <cstddef>
+
+#include "ColorLutBuilder.hpp"
+
+namespace geopro::render {
+
+namespace {
+// LUT 级数。
+constexpr int kLutLevels = 256;
+}  // namespace
+
+vtkSmartPointer<vtkActor> buildCurtain(const geopro::core::Grid& g,
+                                       const geopro::core::ColorScale& cs,
+                                       const geopro::core::GeoLocalFrame& frame)
+{
+    const int nx = g.nx(), ny = g.ny();
+
+    // 退化网格：返回空 actor（调用方仍可安全 addActor，mapper 无输入则不绘制）。
+    if (nx < 1 || ny < 1 || g.y.size() < static_cast<size_t>(ny)) {
+        return vtkSmartPointer<vtkActor>::New();
+    }
+
+    const bool hasLatLon =
+        g.lat.size() >= static_cast<size_t>(nx) && g.lon.size() >= static_cast<size_t>(nx);
+
+    // 结构化网格：维度 (nx, ny, 1)，点序 i 最快、j 次之（id = j*nx + i）。
+    vtkNew<vtkStructuredGrid> sgrid;
+    sgrid->SetDimensions(nx, ny, 1);
+
+    vtkNew<vtkPoints> points;
+    points->SetNumberOfPoints(static_cast<vtkIdType>(nx) * ny);
+
+    vtkNew<vtkDoubleArray> sc;
+    sc->SetName("v");
+    sc->SetNumberOfTuples(static_cast<vtkIdType>(nx) * ny);
+
+    for (int j = 0; j < ny; ++j) {
+        for (int i = 0; i < nx; ++i) {
+            double px, py;
+            if (hasLatLon) {
+                auto p = frame.toLocal(g.lat[i], g.lon[i]);
+                px = p.x;
+                py = p.y;
+            } else {
+                // 退化：用 g.x[i] 作 x、0 作 y。
+                px = (g.x.size() > static_cast<size_t>(i)) ? g.x[i] : static_cast<double>(i);
+                py = 0.0;
+            }
+            const vtkIdType id = static_cast<vtkIdType>(j) * nx + i;
+            points->SetPoint(id, px, py, g.y[j]);  // z=深度/高程，VTK Z 向上
+            sc->SetValue(id, g.valueAt(i, j));
+        }
+    }
+
+    sgrid->SetPoints(points);
+    sgrid->GetPointData()->SetScalars(sc);
+
+    // vmin/vmax 来自 Grid；若退化(==)则扫数据兜底。
+    double vmin = g.vmin, vmax = g.vmax;
+    if (vmin >= vmax) {
+        const auto& vals = g.values();
+        vmin = vals.empty() ? 0.0 : vals.front();
+        vmax = vmin;
+        for (double v : vals) {
+            if (v < vmin) vmin = v;
+            if (v > vmax) vmax = v;
+        }
+        if (vmin >= vmax) vmax = vmin + 1.0;
+    }
+
+    auto lut = buildLut(cs, vmin, vmax, kLutLevels);
+
+    vtkNew<vtkDataSetMapper> mapper;
+    mapper->SetInputData(sgrid);
+    mapper->SetScalarModeToUsePointData();
+    mapper->SetLookupTable(lut);
+    mapper->SetScalarRange(vmin, vmax);
+
+    auto actor = vtkSmartPointer<vtkActor>::New();
+    actor->SetMapper(mapper);
+    return actor;
+}
+
+}  // namespace geopro::render
diff --git a/src/render/actors/CurtainActor.hpp b/src/render/actors/CurtainActor.hpp
new file mode 100644
index 0000000..3404245
--- /dev/null
+++ b/src/render/actors/CurtainActor.hpp
@@ -0,0 +1,14 @@
+#pragma once
+#include <vtkSmartPointer.h>
+#include <vtkActor.h>
+#include "model/Field.hpp"
+#include "model/ColorScale.hpp"
+#include "geo/GeoLocalFrame.hpp"
+namespace geopro::render {
+
+// 测线竖直帘面：沿 lat/lon 迹线立在世界(x,y)，纵向为深度 g.y，面按 colorBar 着色。
+vtkSmartPointer<vtkActor> buildCurtain(const geopro::core::Grid& g,
+                                       const geopro::core::ColorScale& cs,
+                                       const geopro::core::GeoLocalFrame& frame);
+
+}  // namespace geopro::render
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index bd16b57..300b12c 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -31,6 +31,7 @@ target_sources(geopro_tests PRIVATE core/test_color_scale.cpp)
 target_sources(geopro_tests PRIVATE core/test_idw.cpp)
 target_sources(geopro_tests PRIVATE core/test_crs_transform.cpp)
 target_sources(geopro_tests PRIVATE core/test_model_data.cpp)
+target_sources(geopro_tests PRIVATE core/test_geo_frame.cpp)
 target_link_libraries(geopro_tests PRIVATE geopro_core)
 
 target_sources(geopro_tests PRIVATE data/test_parsers.cpp)
@@ -57,10 +58,12 @@ endif()
 
 # render 层：ColorLutBuilder（core ColorScale -> vtkLookupTable）。
 # 需 vtkLookupTable（VTK::CommonCore）；geopro_render 已 PUBLIC 传递其余 VTK 组件。
-find_package(VTK REQUIRED COMPONENTS CommonCore CommonDataModel)
+find_package(VTK REQUIRED COMPONENTS CommonCore CommonDataModel RenderingCore)
 target_sources(geopro_tests PRIVATE render/test_color_lut.cpp)
 # dd_voxel：buildVoxel(ScalarVolume->vtkImageData->GPU 体绘制) 构建不崩 + dims 正确。
 target_sources(geopro_tests PRIVATE render/test_voxel_build.cpp)
+# Curtain：buildCurtain(Grid+GeoLocalFrame->vtkStructuredGrid 帘面) 非空 actor + 点数=nx*ny。
+target_sources(geopro_tests PRIVATE render/test_curtain.cpp)
 target_link_libraries(geopro_tests PRIVATE geopro_render ${VTK_LIBRARIES})
 vtk_module_autoinit(TARGETS geopro_tests MODULES ${VTK_LIBRARIES})
 
diff --git a/tests/core/test_geo_frame.cpp b/tests/core/test_geo_frame.cpp
new file mode 100644
index 0000000..75a263a
--- /dev/null
+++ b/tests/core/test_geo_frame.cpp
@@ -0,0 +1,39 @@
+#include <gtest/gtest.h>
+
+#include <cmath>
+
+#include "geo/GeoLocalFrame.hpp"
+
+using geopro::core::GeoLocalFrame;
+
+namespace {
+constexpr double kPi = 3.14159265358979323846;
+}
+
+// 原点投影到 (0,0)。
+TEST(GeoFrame, OriginMapsToZero) {
+    GeoLocalFrame f(22.5, 114.16);
+    auto p = f.toLocal(22.5, 114.16);
+    EXPECT_NEAR(p.x, 0.0, 1e-9);
+    EXPECT_NEAR(p.y, 0.0, 1e-9);
+}
+
+// 东向 0.01 度经度：x>0，约 0.01*111320*cos(22.5°)≈1028m（5% 容差）。
+TEST(GeoFrame, EastwardLongitudeGivesPositiveX) {
+    GeoLocalFrame f(22.5, 114.16);
+    auto p = f.toLocal(22.5, 114.17);
+    const double expected = 0.01 * 111320.0 * std::cos(22.5 * kPi / 180.0);
+    EXPECT_GT(p.x, 0.0);
+    EXPECT_NEAR(p.x, expected, expected * 0.05);
+    EXPECT_NEAR(p.y, 0.0, 1e-9);
+}
+
+// 北向 0.01 度纬度：y≈0.01*110540≈1105m（5% 容差）。
+TEST(GeoFrame, NorthwardLatitudeGivesPositiveY) {
+    GeoLocalFrame f(22.5, 114.16);
+    auto p = f.toLocal(22.51, 114.16);
+    const double expected = 0.01 * 110540.0;
+    EXPECT_GT(p.y, 0.0);
+    EXPECT_NEAR(p.y, expected, expected * 0.05);
+    EXPECT_NEAR(p.x, 0.0, 1e-9);
+}
diff --git a/tests/render/test_curtain.cpp b/tests/render/test_curtain.cpp
new file mode 100644
index 0000000..ddb3a18
--- /dev/null
+++ b/tests/render/test_curtain.cpp
@@ -0,0 +1,40 @@
+#include <gtest/gtest.h>
+
+#include <vtkDataSet.h>
+#include <vtkDataSetMapper.h>
+#include <vtkMapper.h>
+
+#include "actors/CurtainActor.hpp"
+#include "geo/GeoLocalFrame.hpp"
+#include "model/ColorScale.hpp"
+#include "model/Field.hpp"
+
+using namespace geopro::core;
+
+// buildCurtain: 小 Grid(3,2) + lat/lon/y/values -> 非空 actor，mapper 输入点数=6。
+TEST(Curtain, BuildsStructuredGridFromSmallGrid) {
+    Grid g(3, 2);  // nx=3 (lat/lon 列), ny=2 (深度行)
+    g.lat = {22.50, 22.50, 22.50};
+    g.lon = {114.16, 114.17, 114.18};
+    g.y = {0.0, -10.0};  // 两层深度
+    double n = 0.0;
+    for (int j = 0; j < 2; ++j)
+        for (int i = 0; i < 3; ++i) g.valueAt(i, j) = n++;
+    g.vmin = 0.0;
+    g.vmax = 5.0;
+
+    ColorScale cs;
+    cs.addStop(0.0, Rgba{0, 0, 255, 255});
+    cs.addStop(5.0, Rgba{255, 0, 0, 255});
+
+    GeoLocalFrame frame(22.50, 114.16);
+
+    auto actor = geopro::render::buildCurtain(g, cs, frame);
+    ASSERT_NE(actor.GetPointer(), nullptr);
+
+    auto* mapper = vtkDataSetMapper::SafeDownCast(actor->GetMapper());
+    ASSERT_NE(mapper, nullptr);
+    auto* input = mapper->GetInput();
+    ASSERT_NE(input, nullptr);
+    EXPECT_EQ(input->GetNumberOfPoints(), 6);
+}