Invisible Beams… aka Rookie Mistake… aka Expert Trick
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Hidden walls and beams can cut visible elements, and not all trimming is done with SEOs or the trim to roof command. This is most often seen by new users when they don't yet understand layer intersection groups and priority
Conditional Operators… aka Graphic Operators… aka POST 100
(note: if you read this before 11 pm on Sunday June 19th, 2011, you should reread it as I've made some important updates) In many 2D drawings (whether done by hand or flatcad) parts of objects are left undrawn for clarity.