Preview Minecraft Bedrock Edition world-generation features in 3D, right inside VS Code. Open a feature or feature_rules JSON file from a behavior pack to see the blocks and structures it generates. Resource pack textures are applied automatically, with no extra setup required.
Features
3D preview: Drag to rotate, scroll to zoom, and double-click to reset the view. Inspect interiors with X/Y/Z cross-section and half-cut views, and show or hide individual block layers.
Reproducible seeds: Reuse a seed to reproduce the same result, or try a new seed with one click to explore different outcomes. Ore features are automatically placed underground for previewing.
Reference chain explorer: Expand the chain from rules to child features to blocks. Missing references and circular references are highlighted in the Feature 引用链 (Feature Reference Chain) view; click a node to preview any level of the chain.
Automatic textures: Load block textures from workspace resource packs, including animated textures such as fire and lava. Biome tinting is supported, with 10 presets for foliage colors.
Custom block shapes: Render fences, slabs, stairs, and other non-full-cube blocks using their models.
Export: Save the generated block list as JSON through the system save dialog.
Automatic refresh: Update the preview as you edit or save the JSON file.
Open a preview
Use any of the following entry points. UI labels below match those shown in the extension; English translations are provided for reference.
Entry point
Action
Explorer
Right-click a feature or rule JSON file → Feature Viewer: 预览 Feature / 规则 (Preview Feature / Rule)
Editor
Right-click inside an open JSON file → the same preview command
Editor tab
Right-click the file tab → the same preview command
Editor toolbar
Click the preview button in the upper-right corner
Keyboard shortcut
Press Ctrl+Alt+V while editing a JSON file
Command Palette
Run Feature Viewer: 预览 Feature / 规则
The preview opens beside the editor. Click 在编辑器中打开 (Open in Editor) to return to the source file at any time.
Usage notes
JSON files under features/ and feature_rules/ directories in the workspace are automatically included in reference resolution. The NetEase mod equivalents, netease_features/ and netease_feature_rules/, are also supported.
To preview a rule, open the rule JSON directly. Some features depend on variables supplied by their rule; previewing the feature on its own may display 缺上下文 (Missing Context).
Features that require caves, ceilings, or other specific environments, such as cave scatter features and hanging vines, may fail to place in the flat-ground preview. The status bar shows the reason for the failure.
Workspace resource packs are loaded automatically. You can also import a folder, .mcpack, or .zip from the 材质与资源包 (Materials & Resource Packs) section of the preview panel. Manually imported resources take priority over automatically loaded ones.
Settings
Setting
Default
Description
featureViewer.defaultSeed
49
Default random seed for previews; you can change it in the preview panel at any time
featureViewer.autoRefresh
true
Automatically refresh the preview when a file is edited or saved
Troubleshooting
Empty preview or unresolved references: A referenced child feature may be missing from the relevant workspace directories. Place it in the features/ directory, then click 未解析 (Unresolved) in the status bar or run Feature Viewer: 刷新引用链 (Refresh Reference Chain).
Missing context (t.* variables): These feature parameters are supplied by a rule. Open the preview from the rule JSON instead.
Textures are not applied: Check that the resource pack contains textures/terrain_texture.json. When importing manually, select the resource pack's root folder or its parent folder.
Ore is not visible: Ore generates underground, and the preview automatically moves the view below ground. You can also adjust the placement height under 生成参数 (Generation Parameters).
Feedback
To report a problem or request support for more feature types, email either of the following addresses:
