wFace:

The wFace is a triangle in the 3D space. It is formed on three wNodes. In the 3D view, it is visible only from the front side. However, its sides can be fliped using 'Flip wFace' button . It can be assigned any material from the wheel materials. If 'Shade smooth' is checked for this material, its surface normals would be modified to blend with adjacent wFaces. wFaces are repeated around the wheel number of times it is defined in the wheel parameters.