Construction lines on back side of imported baseline image

Pinwheel House1.skp (5.6 MB)
Thank You for your help Dave R, but it does not seem to be any help. I tried setting profiles to 1 but I still don’t see any gaps. The non face color is grey not blue. If I invert the selection, all the lines turn blue and the background is dotted blue on healed areas and everything else is still grey.
I tried to heal the kitchen floor by dividing it up and incrementally opening one segment to a healed counter face. I get about 3 segments in and it all goes grey. All that floor was previously white and healed until I tried to open a grey section in the living room to the white floor to heal the living room floor and then it all went grey, again. Sections that would heal white revert to grey even though they supposedly must have had intact faces or they wouldn’t have turned white in the first place.
This is what I mean by unpredictable and incomprehensible when it comes to dealing with this program. Enclosed is the current state of my house plan so you can see what I am dealing with.
This is a repeat of my original problem where I ask "Is there a universal heal command?. You can see similar grey areas on the house plan I abandoned since I could never heal it.

Why have you hidden faces. What’s with all the guides.
GIF 27-02-2022 4-23-14 PM

You have a bunch of hidden faces. Turning on Hidden Geometry exposes them as screens.

There’s a triangular area that has no face but that can be fixed by stitching across it with the Line tool.
Screenshot - 2_26_2022 , 11_13_05 PM

So unhiding the hidden faces and stitching that triangle closed seems to sort it.

You’d make your life easier if you delete the mess of guides lines.

You seem to be treating it as a 2D CAD program which it is not. Truthfully the process you are following is not really the right way to create a 3D model of a house. You aren’t using groups or components which you should be doing, Instead the geometry is all loose and connected. It’s really no wonder that you are having these difficulties.

Pinwheel House1.skp (5.5 MB)

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Thanks guys, This is the solution. Unhiding and stitching brought back all my faces.
I thought you had to start a 3D model as a 2D drawing. I do not understand how I got hidden faces as I have never consciously attempted to hide anything. It may be the result of my frantic attempts to keep the original source drawing visible, which as you can see I gave up on.
I did find that the grey area is the back face but I do not understand why the program would put an active part of the program on the back face. Is that what hides it? Why would the hidden back face have precedence over an active front face?
The guide lines are my attempt to do a Wrightian grid. The main unit is 10 square with half and quarter lines.They will be erased once everything is laid out.

This is generally true but what I do is draw the 2d basis for PARTS of the final model. So I just need the outline for the floor and make it a component. If needed I can give it a Tag and hide the tag while I work on other things. Not make all of the import 2d at once. The approach varies if you are making a house model where the floor element is just one big shape, a piece of furniture with legs etc. or a widget that may be extruded as one piece.

Make it a component if it isn’t one. You can keep a copy of it lower down. you may indeed want to explode a copy for drawing ( I usually only trace over imported edges, not use them directly. Most of my imports are my own drawings so I can use them or not with confidence.) If the imported plan is a compoenent, even if you lose it you can get it back from the component library. You can raise a copy up or down as you need while you work. If it is given a Tag you can keep it in place and hide it or show it throughout the project.
NOTE: if you explode something it will give the contents the tag that the component or group originally had. When you import geometry it may have Tag based on the layer from the CAD file. Always seek to return edges and faces to Untagged setting. Only groups and components (and text and dimensions) should have tags in your file.

No, this should not happen. Guides, and edges drawn in a plane should show from both sides of a face that is on the plane. If it is actually coplanar with a face and disappearing, it must be a problem with your graphics card or driver. (or something else with your set up–it’s NOT normal behavior). IF however you have objects BEYOND a face then, yes it will be hidden. In such a case you can use X-ray or back edges view settings if you want to be able to see them.

You can also put the guides in a component and give them a Tag so you can hide it when it gets too crazy. You can also hide guides but that will hide all of them.

You guys are awesome! Thanks for all the help!

Keeping this alive for reference if you don’t mind.
I’m slowly moving into grouping objects more.

Don’t just do it ‘more’. Make it a rule never to leave ‘loose geometry’ (edges and faces) in your model for any longer than it takes to draw them before you make it into a group (or generally better) a component.

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If you look at the bottom of the thread you have the option to Bookmark the whole thread so you can come back to it easily and the 3 dots on the bottom right of any specific post will allow you to bookmark the specific post for latter reference.
Bumping a thread just to keep it higher in the active topics is not a good way to keep it alive for your reference.

Thanks!

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