4.3 Hole Generation
Overview: The Origin of “Holes” in Trees
It is rare to find a perfect tree in real life usually the older the tree the more defects it will have. Holes are a common attribute of trees found in the wild as well as trees planted by humans. Usually the holes are not that big and sometimes trees have much bigger empty parts inside the trunk or in big branches. The water collects there and makes a perfect situation for rotting. Also fungus or other animals make use of such holes, usually making them become bigger and bigger. Holes can appear as a result of humidity and dead leaves, which remain in same place for a long period of time. Holes are usually noticeable in tree “forks” this means where the trunk separates and two or more steams grow. This is evident in the connections of big branches, cracks and other complicated shapes of trunks. Usually the tree does not die just from rotting, but the rotting could destroy water circulation and that could lead to the long death of a tree which could take many years. If the wind tears a branch off or if other animals or insects injure the outer layers of tree, the fungus and other kind of bacteria start to live in these places, and that makes the tree rotten (Tree Holes).
Regarding the 3d generation of a hole it should begin by determining where are possible locations for a hole in a tree stem. Detection of possible locations could be done by determining where the trunk surface is not planar. The reason, is that holes in a trunk appear in positions where a tree is injured, or where the tree’s architecture is week. There are many biological reasons for a hole’s appearance, therefore there could be many solutions. So far I have described what a hole in a tree trunk is and I have also gone into details regarding how a hole appearance can be a result of a very old tree trunk injury. In the next section I present tools used as well as two proposals for an automatic hole generation tool which detects the best position of a hole utilizing two possible methods. The first method detects a possible hole’s position based upon a trees surface and where conditions are suitable for rotting to occur. The second method has more to do with the overall structure of a tree.
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