Synopsis
 reverseNormals ()
Description
The reverseNormals operation reverses the face normals of the geometry of the current shape.
Related
Examples
Left box: face with index=0 not inverted
 Right box: face with index=0 inverted

Advanced knowledge: Understanding the reversion process
Normals: The normal of a polygonal face is defined by the vertex order. By default, the order is counterclockwise.
Some advanced users may notice that after the reverseNormals command, the vertex order [black] is not only inverted (as in the classic mathematical definition of the normal inversion [blue]) but is offset by the value of 1 [red]. The reason for this is because the CityEngine often works with the "First Edge", which is defined by the vertex indices 0 and 1. Thus, in the reverseNormals command, the "First Edge" is retained.
 black: standard vertex order of the face (counterclockwise)
 blue: classic reverted vertex order
 red: reverted vertex order as used in the CityEngine, with retained first edge.