Unintuitive default split when logging three images

[roym899]

Describe the annoyance
When logging exactly three images to separate entity paths, the first image will be in its own pane, with the remaining two sharing an extra grid pane. It's a bit annoying to rearrange into a view where all images have the same size. This seems to only happen when logging exactly three images.

To Reproduce

import rerun as rr
import numpy as np

rr.init("test", spawn=True)

rr.log("image1", rr.Image(np.random.rand(100,100,3)))
rr.log("image2", rr.Image(np.random.rand(100,100,3)))
rr.log("image3", rr.Image(np.random.rand(100,100,3)))
# rr.log("image4", rr.Image(np.random.rand(100,100,3)))

Expected behavior
All images should appear in a consistent way in the viewer (i.e., all taking the same amount of space).

Additional context

rerun_py 0.10.0-alpha.7+dev [rustc 1.72.1 (d5c2e9c34 2023-09-13), LLVM 16.0.5] x86_64-unknown-linux-gnu main 47414c8, built 2023-10-24T12:00:38Z

[Wumpf]

@emilk something we want to consider fixing in the default tiling or close as won't fix with explicit user blueprint as the future solution?

[emilk]

I think the problem here is that we have a heuristic for the default arrangement that will never be perfect.

The current heuristic is not smart enough to know that some of the space-views have a fixed aspect ratios (as 2D space-view have, but 3D space-views do not). Adding this support is possible, but challenging.

The real solution is to make it easier for users to change the default from code and in the UI:

• Blueprint control of layout hierarchy #2276
• Interactive layout items in blueprint tree view #2652