I am having similar problems in C3D 2018 as well. I have a fairly simple grading drawing where running audit causes random feature lines to either disappear or lose their elevations. On my last job I avoided mixing corridors and feature lines altogether and did not have any ...
This can be accounted for by the fact that α characterizes the structural shape (the extent of a body is defined as 1D, 2D, or 3D), and when α = 1 all bodies shrink into 3D materials, therefore, the specific surface area differences disappear. Table 4. Specific surface area of ...