Why are certain faces a dark blue or light blue, while other faces in the same model white?
They are the ābackā side of the faces. You can change this in the style settings. Some folks make them fluorescent yellow to better understand how they are modeling.
You can also āreverseā them by right clicking on a face.
YOUR RIGHT! Thankyou for the helpful feedback.
See model attached.
01-13 -2025 - why are certain faces blue, grey etc, when most are white!!!.skp (10.2 MB)
The ādark blueā faces are all the back sides. Faces in SketchUp have no thickness but they have a front and back.
Give the walls thickness and you shouldnāt have exposed back faces. You should also make sure you are using tags correctly. Untagged should be left active at all times. All edges and faces should be created and remain untagged. Only groups and components should be given tags. You arenāt doing that in this model.
And donāt apply materials to the model until you have the geometry correct.
As Dave says, the darker color is the back side of a 2D plane, every plane has a front and back. However, you can apply materials to either face independently, a plane can be red on one side and yellow on the other. The default for the style you are using is white on the front side and blue/grey on back side. You might be confused because some of your walls are white on both the front and back, that is because you have painted the back sides with a white material making the two sides look identical. If you remove the paint applied or switch to a monochrome style you will see the same blue/grey back on all of them.
Youāre correct on tags, but re āwallsā: this is a thermal boundary model for import into an energy modeling software called āWUFIā. This is not an architectural model. And I understand the concept of reversing faces. I still donāt understand why the non-conforming colors.
Sketchup is a bunch of edges and faces, how you classify them is up to you.
They are not magic or fantasticalā¦ But they do have front and back faces to determine what is inside and what is outside. Thickness is another issue, faces in sketchup have no thicknessā¦
Having an understanding of your tools is an essential part of anyoneās profession.
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