Dumb Offical Part Question: Lines and Sharp Edges

[Travis Cobbs]

Interior curves (where the curve can never trigger a conditional edge line that is visible on-screen) aren't required to have conditional lines on them. Many do because of LDView's smoothing relying on conditional edge lines. Many others do because they use primitives, and all curve primitives are allowed to be interior or exterior, so contain conditional edges. All creases are required to have edge lines (line type 2, color 24).