[3.x] VisualServer now sorts based on AABB position

[QbieShay]

this was causing issues with scenes where the origin of the objects
was set for all objects to the center of the scene, making transparent
objects sort improperly

This work was kindly sponsored by IMVU

Co-authored-by: RevoluPowered gordon@gordonite.tech

[akien-mga]

Cross-referencing the master PR: #43507.

[akien-mga]

So if I understood correctly the plan for #43507 ended up being to merge it for 3.2 only, so I guess this 3.2 PR should be amended to do things like #43507 ended up doing it?

[QbieShay]

Ok I know that this took ages and I'm sorry. But it's now made to match 4.0's PR :)

[lawnjelly]

Looks good, but I would consider waiting till after 3.2.4 stable to merge as there is a minor risk of regressions.

[Calinou]

Could we try to merge this for 3.3.2? I see frequent support requests about people struggling with transparency sorting issues that other engines can manage just fine. While transparency sorting is a difficult topic, there shouldn't be any issues with transparent materials that do not overlap with each other and are placed far away from each other.

[lawnjelly]

Could we try to merge this for 3.3.2? I see frequent support requests about people struggling with transparency sorting issues that other engines can manage just fine. While transparency sorting is a difficult topic, there shouldn't be any issues with transparent materials that do not overlap with each other and are placed far away from each other.

Sure, sorry I wasn't too clear, I just meant above that having it go through at least a beta might be a good idea. For instance if it works fine on 3.4 beta 1, then cherry pick for 3.3 etc. 👍

[akien-mga]

Thanks!

[akien-mga]

Cherry-picked for 3.3.3.