How do I render a game in lower resolution and then upscale it to fit the window dimensions?

[hazy vigil]

Right now I'm messing around with code from the render_to_texture example, I've changed it so that it instead renders the inner cube to a sprite and that sprite's seen through a Camera2d, but I'm struggling with getting the Camera3d for the first pass to match the dimensions of the window, it just squashes the view instead

Changing ViewPort::physical_size doesn't seem to change that

Oh! Changing Transform::scale to my resolution ratio worked!

Neat!

Well that gets the ratio right but I'm not entirely sure how big the actual camera is

It's definitely upscaling it somewhat though

Actually I think I should be changing the camera projection instead

OHHH It's in the Image I generate

[icy wave]

hi, would you be able to clarify how you solved this? am myself looking into how you are supposed to upscale in bevy

[hazy vigil]

Basically I modified the render_to_texture example to instead render to a sprite covering the entire window resolution with a 2d camera as the main pass camera

But I'm not a fan of this approach because it breaks mouse picking into the game world