The edges of a face have to be placed on the same height or the same plane. There cannot be a face within the space bordered by the other 4 faces. The lines will be invisible, but the can be brought back by selecting Hidden Geometry in the View menu. This way, Sketchup will smoothen the faces you've selected, creating a smooth curve. Then smoothen the lines between the faces by using the Eraser while holding the control (Ctrl) key. To create an irregular curve, draw your curve in 2D, and pushpull it into 3D the same way as described above. The lines between the faces have been smoothened. Because of this, a curve always exists of a number of individual faces. Use the Push/Pull tool to pull one of the two faces into 3D, and you'll have a curved face on one of the sides of the 3D object.
![sketchup number of surfaces selected sketchup number of surfaces selected](https://s3.amazonaws.com/finewoodworking.s3.tauntoncloud.com/app/uploads/2019/02/25153124/Screenshot-2_25_2019-10_57_12-AM-700x522.png)
Then, you draw an arch, dividing the rectangle into two faces. This way, Sketchup wil automatically draw the line along the intersection border.Ī simple curve can be created by drawing a rectangle. Select Intersect, and select Intersect Selected. If the intersection is too complicated to handle this way, you can select the faces, rightclick them. Intersecting two single faces is possible by drawing a line along the intersection. This will divide the face in two faces they will be handled as two single entities. A face can be divided by drawing a line from one edge to another. This creates a four-sided face, which corners are angled 90°. The easiest way to create a face is by using the rectangle tool. A face can be deleted by rightclicking one, and selecting Erase. Rightclick a face (or a cluster of faces), and select Reverse Faces. A face can be easily turned around so that the inside becomes the outside. Usually, the sides of the faces facing inwards are in default color blue. In Sketchup, an object always has an insides and an outside.
![sketchup number of surfaces selected sketchup number of surfaces selected](https://help.sketchup.com/sites/help.sketchup.com/files/images/sketchup-1011019-Solids.png)
A curved face with and without hidden geometryĪ face represents one side of an object.