Why do i have lies in visible line mode?
I have had this occur when more than one roof is in place. Do you have drawings stacked where each drawing might have a roof drawing attached?
You might try saving this as "roof" and see what it looks like. If you are looking at it from the "elevations" and "top" views it will look different. I'm not sure why it does and it use to throw me off.
No drawings stacked. i checked everything and puzzled.
The lines are typically caused by cutting a hole in the roof. The resulting roof planes are triangulated. You can make them go away by checking "Display Silhouette" in the Model Options Line Options.
Bill is the owner and maintainer of SoftPlanTuts.com