My model is of a floor plan for a house. I have created various household items such as beds and sinks. These are rectangles of various colors, and I have made them components. I have created a larger differently colored rectangle representing the perimeter of the entire house. I would like to draw wall footprints within the perimeter and arrange the components into various floor plans.
At this point, I would like to operate only in two dimensions, like paper cutouts moved about. When I have a floor plan I like, I will Push/Pull it into 3 dimensions.
I draw pairs of guidelines representing wall thicknesses. These run north to south as well as east to west. Then I use Rectangle and sometimes Line to draw the footprints representing walls in straight, L-shaped, or T-shaped runs, then I paint the footprint for clarity. All goes well for a while; but as I draw more guidelines, erase and re-draw items, add and remove components, sooner or later I draw a rectangle that will not take paint. I take this to mean that what looks to me like a rectangle does not have all 4 corners in the same plane. If I zoom in extremely and orbit about each corner, sometimes all appears to be in a single plane; sometimes I see a miniscule dogleg in the surface of the plane, or some other irregularity.
I may be wrong, but it seems to me that as I draw I am unintentionally drifting out of the plane of the original house perimeter. Is there a way to guarantee that I stay in a single plane? Or is it a different problem? Any suggestions?