Dwarf Fortress Bug Tracker - Dwarf Fortress
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0008555Dwarf FortressDwarf Mode -- Environmentpublic2014-11-16 10:382015-01-09 07:30
Toady One 
0008555: Pathfinding is not updated when trees are cut down
Suppose dwarves are unable to reach a tile to build something because tree leaves or branches block the way. If you cut down the tree, the game does not recognize that that point can now be reached. This can result in 'no access to non-economic building material' messages and similar problems.
* Build something under a tree (ramp+wall access ramp, for example)
* Try to build something where dwarves cannot reach (e.g. past a ramp rendered unusable by tree leaves)
* Cut down tree.
* See that you still cannot build in the aforementioned position.
You can 'refresh' the pathing info by deconstructing or building something adjacent to the place where the tree part was. That clears the 'flag' and allows stuff to be built in the previously blocked location.

Save file to follow.
No tags attached.
related to 0006949resolved Toady One Building in trees and then chopping down the tree leaves the building floating in the air 
related to 0008573resolved Footkerchief Unsupported land not dropping (yes, cave-ins are enabled) 
Issue History
2014-11-16 10:38ptb_ptbNew Issue
2014-11-16 11:56FootkerchiefSummary'no-access' flag is not updated when trees are cut down => Pathfinding is not updated when trees are cut down
2014-11-16 12:59ptb_ptbNote Added: 0031016
2014-12-27 19:33FootkerchiefRelationship addedrelated to 0008573
2015-01-02 17:52FootkerchiefRelationship addedrelated to 0006949
2015-01-09 06:53ptb_ptbNote Added: 0031816
2015-01-09 07:30FootkerchiefStatusnew => resolved
2015-01-09 07:30FootkerchiefFixed in Version => 0.40.24
2015-01-09 07:30FootkerchiefResolutionopen => fixed
2015-01-09 07:30FootkerchiefAssigned To => Toady One
2015-01-09 07:30FootkerchiefNote Added: 0031819

2014-11-16 12:59   
Too many server errors at DFFD. Although to be honest, it would be quicker to check it yourself in a game than to download a save.

http://speedy.sh/6HvYv/treeblock.zip [^]

In above save there is a ramp + wall at south edge of map. Top of wall in inaccessible due to tree leaves in the way. Chop down tree -> Top of wall is still inaccessible.
2015-01-09 06:53   
I think this one is fixed now.
2015-01-09 07:30