Did anyone ever really understand the linescale settings in AutoCAD?
Confusing enough for “the imperialists”, it was further complicated for metric users with the addition of “international” file settings & ISO line styles. Many never realised these existed “drawing metric” in imperial .dwg files with imperial linetypes then cranking up the LTScale & hatch pattern scales to compensate.
Combine a mixture of imperial/metric drawing settings, imperial/metric (ISO) linestyles, add modelspace vs paperspace, mix in differing view scales and the whole thing got very confusing. Sort out the file related settings (measurement & measureinit 1 for metric), import the ISO linetypes, get the line scale correct and you still had various paperspace viewport scales to contend with.
Setting global scale to 1, or sometimes not quite 1, with the “Use paperspace units for scaling” (PSLTSCALE) on sorted that out until you went back to modelspace & found all the lines looking continuous, Arrgggggh…!
Finally AutoCAD 2008 adds a MSLTSCALE variable, I know you’re thinking “Not another variable!”, to allow correct scaling in differently scaled layout viewports AND modelspace – phew!
For those hungry for more detail on the variables old & new a lazy Robin will hand over to, not lazy, David Koch who has a great post on the whole thing here: