0010897: Soil floor/ceiling can randomly disappear after a long period of time

Notes
(0038802) PatrikLundell (reporter) 2018-09-15 02:21	It is a known issue that hole appear when trees are cut down if there is a room immediately beneath the tree. Thus, if there is a random hole creation process in play it's hard to distinguish it from the known cause of holes. I've had occasional holes appear, but I've had little reason not to assume they are the results of cutting trees, although I've had cases that surprised me, as I'd thought I'd made dirt roads to block trees from maturing. Proving it's not caused by logging is tricky: - If you can get it to happen in a desert with too little rain to support trees, that would be ideal. - Regularly making dirt road above any vulnerable locations should keep trees away, but it's easy to forget to renew them. As it takes 3 years for a sapling to renew, the dirt road interval has to be shorter than 3 years. - A stockpile (even with nothing allowed to be stored in it) blocks the maturation of trees and does not have to be renewed. If a hole appears under such a stockpile it would probably prove there is a random hole making process in play, but it's not impossible a stockpile might interfere with such a process even if there is one, so absence of holes under a stockpile would not prove that no such process might exist. - Changing the raws to not allow for any trees, or at least no trees in the biome area you intend to perform the experiment in would work well too. You could have a functional fortress with logging if the embark contained one tree less experiment biome and one normal biome (and obviously made the experiment in the tree less part). - Never perform any logging at all over the experiment area. This includes cutting down trees that are in the way or with gobbo bits stuck in the branches.

(0038804) Loci (manager) 2018-09-15 10:07	Were you woodcutting on the surface?

(0038807) Adequate Swimmer (reporter) 2018-09-16 12:19 edited on: 2018-09-16 12:40	The part of the surface where it happened didn't have trees or logging for a while (1-2 yrs), I wanted to see if holes will keep appearing. I will try to make an embark at the edge of a desert using the suggestions above and see if I can get ... evidence of absence.

Issue History
Date Modified	Username	Field	Change
2018-09-14 10:07	Adequate Swimmer	New Issue
2018-09-14 10:08	Adequate Swimmer	Tag Attached: feature
2018-09-14 10:09	Adequate Swimmer	Tag Attached: floor
2018-09-14 10:09	Adequate Swimmer	Tag Attached: z-levels
2018-09-14 10:09	Adequate Swimmer	Tag Attached: soil
2018-09-15 02:21	PatrikLundell	Note Added: 0038802
2018-09-15 10:07	Loci	Note Added: 0038804
2018-09-15 10:07	Loci	Assigned To	=> Loci
2018-09-15 10:07	Loci	Status	new => needs feedback
2018-09-16 12:19	Adequate Swimmer	Note Added: 0038807
2018-09-16 12:19	Adequate Swimmer	Status	needs feedback => assigned
2018-09-16 12:31	Adequate Swimmer	Note Edited: 0038807	View Revisions
2018-09-16 12:40	Adequate Swimmer	Note Edited: 0038807	View Revisions

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