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# Objective As discussed in #15341, ghost nodes are a contentious and experimental feature. In the interest of enabling ecosystem experimentation, we've decided to keep them in Bevy 0.15. That said, we don't use them internally, and don't expect third-party crates to support them. If the experimentation returns a negative result (they aren't very useful, an alternative design is preferred etc) they will be removed. We should clearly communicate this status to users, and make sure that users don't use ghost nodes in their projects without a very clear understanding of what they're getting themselves into. ## Solution To make life easy for users (and Bevy), `GhostNode` and all associated helpers remain public and are always available. However, actually constructing these requires enabling a feature flag that's clearly marked as experimental. To do so, I've added a meaningless private field. When the feature flag is enabled, our constructs (`new` and `default`) can be used. I've added a `new` constructor, which should be preferred over `Default::default` as that can be readily deprecated, allowing us to prompt users to swap over to the much nicer `GhostNode` syntax once this is a unit struct again. Full credit: this was mostly @cart's design: I'm just implementing it! ## Testing I've run the ghost_nodes example and it fails to compile without the feature flag. With the feature flag, it works fine :) --------- Co-authored-by: Zachary Harrold <zac@harrold.com.au>
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Cargo Features
Bevy exposes many features to customise the engine. Enabling them add functionalities but often come at the cost of longer compilation times and extra dependencies.
Default Features
The default feature set enables most of the expected features of a game engine, like rendering in both 2D and 3D, asset loading, audio and UI. To help reduce compilation time, consider disabling default features and enabling only those you need.
| feature name | description |
|---|---|
| android-game-activity | Android GameActivity support. Default, choose between this and android-native-activity. |
| android_shared_stdcxx | Enable using a shared stdlib for cxx on Android |
| animation | Enable animation support, and glTF animation loading |
| bevy_animation | Provides animation functionality |
| bevy_asset | Provides asset functionality |
| bevy_audio | Provides audio functionality |
| bevy_color | Provides shared color types and operations |
| bevy_core_pipeline | Provides cameras and other basic render pipeline features |
| bevy_gilrs | Adds gamepad support |
| bevy_gizmos | Adds support for rendering gizmos |
| bevy_gltf | glTF support |
| bevy_mesh_picking_backend | Provides an implementation for picking meshes |
| bevy_pbr | Adds PBR rendering |
| bevy_picking | Provides picking functionality |
| bevy_remote | Enable the Bevy Remote Protocol |
| bevy_render | Provides rendering functionality |
| bevy_scene | Provides scene functionality |
| bevy_sprite | Provides sprite functionality |
| bevy_sprite_picking_backend | Provides an implementation for picking sprites |
| bevy_state | Enable built in global state machines |
| bevy_text | Provides text functionality |
| bevy_ui | A custom ECS-driven UI framework |
| bevy_ui_picking_backend | Provides an implementation for picking ui |
| bevy_winit | winit window and input backend |
| custom_cursor | Enable winit custom cursor support |
| default_font | Include a default font, containing only ASCII characters, at the cost of a 20kB binary size increase |
| hdr | HDR image format support |
| ktx2 | KTX2 compressed texture support |
| multi_threaded | Enables multithreaded parallelism in the engine. Disabling it forces all engine tasks to run on a single thread. |
| png | PNG image format support |
| smaa_luts | Include SMAA Look Up Tables KTX2 Files |
| sysinfo_plugin | Enables system information diagnostic plugin |
| tonemapping_luts | Include tonemapping Look Up Tables KTX2 files. If everything is pink, you need to enable this feature or change the Tonemapping method for your Camera2d or Camera3d. |
| vorbis | OGG/VORBIS audio format support |
| webgl2 | Enable some limitations to be able to use WebGL2. Please refer to the WebGL2 and WebGPU section of the examples README for more information on how to run Wasm builds with WebGPU. |
| x11 | X11 display server support |
| zstd | For KTX2 supercompression |
Optional Features
| feature name | description |
|---|---|
| accesskit_unix | Enable AccessKit on Unix backends (currently only works with experimental screen readers and forks.) |
| android-native-activity | Android NativeActivity support. Legacy, should be avoided for most new Android games. |
| asset_processor | Enables the built-in asset processor for processed assets. |
| async-io | Use async-io's implementation of block_on instead of futures-lite's implementation. This is preferred if your application uses async-io. |
| avif | AVIF image format support |
| basis-universal | Basis Universal compressed texture support |
| bevy_ci_testing | Enable systems that allow for automated testing on CI |
| bevy_debug_stepping | Enable stepping-based debugging of Bevy systems |
| bevy_dev_tools | Provides a collection of developer tools |
| bmp | BMP image format support |
| dds | DDS compressed texture support |
| debug_glam_assert | Enable assertions in debug builds to check the validity of parameters passed to glam |
| detailed_trace | Enable detailed trace event logging. These trace events are expensive even when off, thus they require compile time opt-in |
| dynamic_linking | Force dynamic linking, which improves iterative compile times |
| embedded_watcher | Enables watching in memory asset providers for Bevy Asset hot-reloading |
| exr | EXR image format support |
| ff | Farbfeld image format support |
| file_watcher | Enables watching the filesystem for Bevy Asset hot-reloading |
| flac | FLAC audio format support |
| ghost_nodes | Experimental support for nodes that are ignored for UI layouting |
| gif | GIF image format support |
| glam_assert | Enable assertions to check the validity of parameters passed to glam |
| ico | ICO image format support |
| ios_simulator | Enable support for the ios_simulator by downgrading some rendering capabilities |
| jpeg | JPEG image format support |
| meshlet | Enables the meshlet renderer for dense high-poly scenes (experimental) |
| meshlet_processor | Enables processing meshes into meshlet meshes for bevy_pbr |
| minimp3 | MP3 audio format support (through minimp3) |
| mp3 | MP3 audio format support |
| pbr_anisotropy_texture | Enable support for anisotropy texture in the StandardMaterial, at the risk of blowing past the global, per-shader texture limit on older/lower-end GPUs |
| pbr_multi_layer_material_textures | Enable support for multi-layer material textures in the StandardMaterial, at the risk of blowing past the global, per-shader texture limit on older/lower-end GPUs |
| pbr_transmission_textures | Enable support for transmission-related textures in the StandardMaterial, at the risk of blowing past the global, per-shader texture limit on older/lower-end GPUs |
| pnm | PNM image format support, includes pam, pbm, pgm and ppm |
| qoi | QOI image format support |
| reflect_functions | Enable function reflection |
| serialize | Enable serialization support through serde |
| shader_format_glsl | Enable support for shaders in GLSL |
| shader_format_spirv | Enable support for shaders in SPIR-V |
| spirv_shader_passthrough | Enable passthrough loading for SPIR-V shaders (Only supported on Vulkan, shader capabilities and extensions must agree with the platform implementation) |
| symphonia-aac | AAC audio format support (through symphonia) |
| symphonia-all | AAC, FLAC, MP3, MP4, OGG/VORBIS, and WAV audio formats support (through symphonia) |
| symphonia-flac | FLAC audio format support (through symphonia) |
| symphonia-isomp4 | MP4 audio format support (through symphonia) |
| symphonia-vorbis | OGG/VORBIS audio format support (through symphonia) |
| symphonia-wav | WAV audio format support (through symphonia) |
| tga | TGA image format support |
| tiff | TIFF image format support |
| trace | Tracing support |
| trace_chrome | Tracing support, saving a file in Chrome Tracing format |
| trace_tracy | Tracing support, exposing a port for Tracy |
| trace_tracy_memory | Tracing support, with memory profiling, exposing a port for Tracy |
| track_change_detection | Enables source location tracking for change detection, which can assist with debugging |
| wav | WAV audio format support |
| wayland | Wayland display server support |
| webgpu | Enable support for WebGPU in Wasm. When enabled, this feature will override the webgl2 feature and you won't be able to run Wasm builds with WebGL2, only with WebGPU. |
| webp | WebP image format support |
| zlib | For KTX2 supercompression |