Rendering egui to a plane/Camera2d

[thedoctor3141]

I've been reading the source code and docs for a while, and I'm frankly lost. I don't want to change the gui component rendering, shaders, or asset management, I know I'll need to override the input, but from what I've read, that should be manageable. I just.. don't see how to create a context with the available render system, and restrict it to a specific Camera. Thanks for any assistance.

Side note: I did notice another topic wanting to render on top of egui. Restructuring the rendering in the manner described above might make that easier.

[aevyrie]

Right now it looks like egui always assumes it is rendering to a window, as it assumes it is tied to an Entity that has a Window:

bevy_egui/examples/two_windows.rs

Line 26 in 537ec1b

fn create_new_window_system(mut commands: Commands) {

Instead, it would probably need to be flipped, so that each egui context must be associated with a Camera, not a Window. Just like Bevy's rendering, egui would render to that Camera's RenderTarget, which can be a Window or an Image. From there, you can apply that Handle<Image> to whatever you want - a plane or any arbitrary mesh.

[mvlabat]

Rendering UI to worldspace should now be possible (we still lack a proper input handling though, I'll probably fix this once Bevy 0.15 lands).