Cannot sneak through open door

[rdeforest]

Luanti version

Luanti 5.11.0

Operating system and version

OS: MacOS Sequoia 15.3

CPU model

Apple M1 MAX

GPU model

Apple M1 MAX

Active renderer

2.1 / opengl / OSX

Summary

A player cannot sneak through an open door

Steps to reproduce

• Setup Luanti 5.10.0, no game, new world, no mods
• Start in creative mode
• Grab a door from the creative mode inventory
• Place the door
• Open the door
• Try to sneak through it
• Be blocked partway into the space (possibly as far in as one can go when it's closed?)

Direction of traversal doesn't matter. I didn't try any permutations of surrounding geometry (slopes, ladders, etc).

I suspect issue #15668 will obsolete this issue by removing either doors, sneaking or both from Luanti.

[SmallJoker]

This is not a regression. The same also occurs in Minetest 5.9.1 and very likely older versions too.

Reason for this is the not-too-overengineered sneak node evaluation code:

luanti/src/client/localplayer.cpp

Lines 160 to 176 in 166e029

	// And the node(s) above have to be nonwalkable
	bool ok = true;
	if (!physics_override.sneak_glitch) {
	u16 height =
	ceilf((m_collisionbox.MaxEdge.Y - m_collisionbox.MinEdge.Y) / BS);
	for (u16 y = 1; y <= height; y++) {
	node = map->getNode(p + v3s16(0, y, 0), &is_valid_position);
	if (!is_valid_position || nodemgr->get(node).walkable) {
	ok = false;
	break;
	}
	}
	} else {
	// legacy behavior: check just one node
	node = map->getNode(p + v3s16(0, 1, 0), &is_valid_position);
	ok = is_valid_position && !nodemgr->get(node).walkable;
	}

The minetest_game door is walkable (≃ solid), but is not a full-size node, thus it's an unhandled case here. This might be better be solved by using collision detection results...