get_global_transform_interpolated doesn't work when the object is hidden

[retrotails]

Tested versions

bisected to ae04a3a

System information

linux

Issue description

get_global_transform_interpolated returns the non-interpolated position when the object is hidden. this is a regression bisected to ae04a3a

Steps to reproduce

see mrp

Minimal reproduction project (MRP)

extends Node3D
var t = 0.0
func _physics_process(delta: float) -> void:
	t += delta
	$bottom.position.x = sin(t)*3.0
	$bottom.visible = fmod(t/2,1.0) < 0.5
func _process(delta: float) -> void:
	$top.position.x = $bottom.get_global_transform_interpolated().origin.x

2025-06-06.webm

mrp_interp.zip

[akien-mga]

Likely a duplicate of #107142?

[retrotails]

Likely a duplicate of #107142?

I compiled #107175, my mrp still stutters

[lawnjelly]

This is actually intentional. Hidden objects are not physics interpolated in order to save processing. Consider a whole branch may be hidden and moved via a parent, calculating all their interpolated xforms would in most cases be extremely wasteful.

EDIT:
Thinking about it I can see some situations where this would be really handy, rather than working around by using unhidden Node3D. This wasn't an obvious use case.

I think this can likely be done by calculating such hidden chains on demand, it may not be hugely involved. I'll have a look tommorrow / monday. It won't be as cheap as unhidden nodes, but should be user transparent.

Likely a duplicate of #107142?

No, these are quite different issues (although they both concern hidden objects). #107142 should be fixed with #107175 .