diff --git a/README.md b/README.md
index 8ad328c..ce53e3d 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,12 @@ git clone https://github.com/XuanYu-github/comfyui-PlyPreview.git
 
 ![加载与刷新 PLY 列表示例](Figure2.png)
 
+### Preview Gaussian 节点键盘操作
+- 点击预览区域以获取焦点后，W/S/A/D 平移视角（前/后/左/右）。
+- Q/E 水平旋转（Q 左旋，E 右旋）。
+- R/F 俯仰旋转（R 上仰，F 下俯）。
+- 鼠标左键拖拽旋转，右键拖拽平移，滚轮缩放。
+
 ## 依赖
 - ComfyUI（默认已启用 DOM widgets）。
 - Python：`plyfile`、`numpy`（缺失时 `pip install plyfile numpy`）。
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..b88fc98
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,37 @@
+[project]
+name = "comfyui-PlyPreview"
+description = "Gaussian Splat PLY loader + preview nodes for ComfyUI. Forked from GeometryPack and repackaged to avoid upstream overwrites. Includes front-end viewer (gsplat.js) bundled locally."
+version = "1.1.0"
+license = {file = "LICENSE"} 
+# classifiers = [
+#     # For OS-independent nodes (works on all operating systems)
+#     "Operating System :: OS Independent",
+#
+#     # OR for OS-specific nodes, specify the supported systems:
+#     "Operating System :: Microsoft :: Windows",  # Windows specific
+#     "Operating System :: POSIX :: Linux",  # Linux specific
+#     "Operating System :: MacOS",  # macOS specific
+#
+#     # GPU Accelerator support. Pick the ones that are supported by your extension.
+#     "Environment :: GPU :: NVIDIA CUDA",    # NVIDIA CUDA support
+#     "Environment :: GPU :: AMD ROCm",       # AMD ROCm support
+#     "Environment :: GPU :: Intel Arc",      # Intel Arc support
+#     "Environment :: NPU :: Huawei Ascend",  # Huawei Ascend support
+#     "Environment :: GPU :: Apple Metal",    # Apple Metal support
+# ]
+
+dependencies = ["numpy>=1.23", "plyfile>=1.0.3"]
+
+[project.urls]
+Repository = "https://github.com/XuanYu-github/comfyui-PlyPreview"
+#  Used by Comfy Registry https://registry.comfy.org
+Documentation = "https://github.com/XuanYu-github/comfyui-PlyPreview/wiki"
+"Bug Tracker" = "https://github.com/XuanYu-github/comfyui-PlyPreview/issues"
+
+[tool.comfy]
+PublisherId = "xuanyu"
+DisplayName = "comfyui-PlyPreview"
+Icon = ""
+includes = [] 
+# "requires-comfyui" = ">=1.0.0"  # ComfyUI version compatibility
+
diff --git a/web/js/gaussian_preview.js b/web/js/gaussian_preview.js
index d71ffb7..8890b43 100644
--- a/web/js/gaussian_preview.js
+++ b/web/js/gaussian_preview.js
@@ -33,8 +33,14 @@ app.registerExtension({
                         const json = await resp.json();
                         const files = Array.isArray(json.files) && json.files.length > 0 ? json.files : ["No PLY files found"];
                         if (widget) {
-                            widget.options.values = files;
-                            widget.value = files[0];
+                            // Update dropdown choices and keep current selection if still present
+                            widget.options = { ...(widget.options || {}), values: files };
+                            if (!files.includes(widget.value)) {
+                                widget.value = files[0];
+                                widget.callback?.(widget.value);
+                            }
+                            // Force UI redraw
+                            widget.computeSize?.();
                             this.setDirtyCanvas(true);
                             app.graph.setDirtyCanvas(true, true);
                         }
@@ -46,10 +52,13 @@ app.registerExtension({
                 this.refreshPlyList = refreshList;
                 refreshList();
 
-                // Add in-node refresh button instead of relying on context menu
-                this.addWidget("button", "Refresh PLY list", () => this.refreshPlyList && this.refreshPlyList(), {
+                // Hint label: user must right-click "Reload Node" to refresh PLY list
+                const hintEl = document.createElement("div");
+                hintEl.style.cssText = "font-size:10px;color:#888;text-align:center;padding:4px 8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;";
+                hintEl.textContent = "Right-click → Refresh Node to load new PLY files";
+                this.addDOMWidget("ply_hint", "PLY_HINT", hintEl, {
                     serialize: false,
-                    width: 180,
+                    hideOnZoom: false,
                 });
 
                 return r;
diff --git a/web/js/gsplat-bundle.js b/web/js/gsplat-bundle.js
index 902d885..d01a3a5 100644
--- a/web/js/gsplat-bundle.js
+++ b/web/js/gsplat-bundle.js
@@ -2024,7 +2024,7 @@ void main () {
     constructor(t = null, n = null) {
       this._backgroundColor = new dt();
       const i = t || document.createElement("canvas");
-      t || (i.style.display = "block", i.style.boxSizing = "border-box", i.style.width = "100%", i.style.height = "100%", i.style.margin = "0", i.style.padding = "0", document.body.appendChild(i)), i.style.background = this._backgroundColor.toHexString(), this._canvas = i, this._gl = i.getContext("webgl2", { antialias: false });
+      t || (i.style.display = "block", i.style.boxSizing = "border-box", i.style.width = "100%", i.style.height = "100%", i.style.margin = "0", i.style.padding = "0", document.body.appendChild(i)), i.style.background = this._backgroundColor.toHexString(), this._canvas = i, this._gl = i.getContext("webgl2", { antialias: false, preserveDrawingBuffer: true });
       const e = n || [];
       n || e.push(new Nt()), this._renderProgram = new Ct(this, e);
       const A = [this._renderProgram];
diff --git a/web/viewer_gaussian.html b/web/viewer_gaussian.html
index faca78a..479ffd5 100644
--- a/web/viewer_gaussian.html
+++ b/web/viewer_gaussian.html
@@ -169,6 +169,7 @@
             try {
                 scene = new SPLAT.Scene();
                 camera = new SPLAT.Camera();
+                // WebGLRenderer - preserveDrawingBuffer enabled in gsplat-bundle.js
                 renderer = new SPLAT.WebGLRenderer(canvas);
                 controls = new SPLAT.OrbitControls(camera, canvas);