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1) Octree is built directly from the triangle mesh by checking overlap of a triangle with an octree cell. This shall produce a tighter octree with less dense cells. 2) The same method is used for both the adaptive / support cubic infill, where for the support cubic infill the non-overhang triangles are ignored. The AABB tree is no more used. 3) Optimized extraction of continuous infill lines in O(1) instead of O(n^2)