| # UI debugging tips |
| |
| For general debugging info see the |
| [Fuchsia Debugging Workflow](/docs/development/debugging/debugging.md). |
| |
| ## Capture the Screen |
| |
| ### Take a Screenshot |
| |
| A screenshot takes a screenshot of what is currently displayed on the Fuchsia |
| device's screen. It returns a 2D buffer. |
| |
| From the Fuchsia device console, run: |
| |
| ```posix-terminal |
| screencap /tmp/filename.ppm |
| ``` |
| |
| From your host workstation, run: |
| |
| ```posix-terminal |
| fx scp [$(fx get-device-addr)]:/tmp/filename.ppm /tmp/filename.ppm |
| ``` |
| |
| ### Take a Scenic Snapshot |
| |
| A Scenic snapshot takes a 3D representation of what is currently displayed on |
| the screen. It usually takes longer to capture than a screenshot, and can be |
| used to visualize issues with layout of 3D content. |
| |
| From your host workstation, run: |
| |
| ```posix-terminal |
| fx shell gltf_export > filename.gltf |
| ``` |
| |
| You can upload `filename.gltf` to any gltf viewer, such as this |
| [online viewer](https://gltf-viewer.donmccurdy.com/). |
| |
| ### Dump the SceneGraph as Text |
| |
| The [SceneGraph](/docs/concepts/ui/scenic/index.md#scenic-resource-graph) |
| as text is useful when you want to see all the resources, including non-visible |
| elements such as transform matrices. |
| |
| #### Dump the SceneGraph in Fuchsia snapshot |
| |
| A Fuchsia snapshot contains the SceneGraph that is rendered to the screen. |
| Capture it from your host workstation using the following commands: |
| |
| ```posix-terminal |
| fx snapshot |
| ``` |
| |
| ```posix-terminal |
| unzip <snapshot output file> |
| ``` |
| |
| Then, look for Scenic’s info in the inspect file: |
| |
| ```posix-terminal |
| less inspect.json |
| ``` |
| |
| #### Dump the SceneGraph and all Scenic resources |
| |
| To capture all the resources created, including those that are not currently |
| attached to the main SceneGraph, you can use `dump-scenes`. From your host |
| workstation, run the following command: |
| |
| ```posix-terminal |
| ffx component explore /core/ui/scenic -c "cat out/debug/dump-scenes" |
| ``` |