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Modeling > Modifying surfaces > Inverting surface normals
Inverting surface normals
Surfaces, created or imported, are single-sided and have no thickness. You decide which side of the surface is exposed to light. For example, a cube can be used as a box, when seen from the outside, or a room, when seen from the inside. To create a room with 4 walls, a ceiling, and a floor, you could move the WebCam inside a cube and invert its surface.
In the following illustration, on the left, you see the inside of the glass wall. On the right, the glass was inverted, so that you see the outside of the glass wall. By inverting a surface, you indicate which side of the surface you want to look at.
To invert a surface:
Select the surface and choose Modeling > Modify Surface > Invert.
The surface normals are inverted.
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