When running a Rust Bevy application, you might encounter an "Invalid Surface" error. This often happens due to an incompatible or unsupported default graphics backend. To resolve this, you can manually set the WGPU_BACKEND environment variable to force a specific rendering backend.

Setting the WGPU Backend

To explicitly set the backend, use the following command before running your Bevy application:

export WGPU_BACKEND=VULKAN

If Vulkan is not available on your system, try other backends like DX12 (Windows), GL (OpenGL), or METAL (macOS):

export WGPU_BACKEND=DX12  # Windows
export WGPU_BACKEND=GL    # OpenGL
export WGPU_BACKEND=METAL # macOS

Once you've set the appropriate backend, compile and run your Bevy app:

cargo run

This should resolve the invalid surface error and allow your application to render in a window.