In file include/igraph3d.h:

struct G3DPolygonAFP

Structure containing all info needed by AddFogPolygon (AFP)
float inv_aspect
Invert aspect ratio that was used to perspective project the vertices (1/fov)
G3DPolyNormal normal
The plane equation in camera space of this polygon. @@@ BAD NAME
int num
Current number of vertices.
G3DVertex vertices[100]
Vertices that form the polygon.

Documentation

Structure containing all info needed by AddFogPolygon (AFP)
int num
Current number of vertices.

G3DVertex vertices[100]
Vertices that form the polygon.

float inv_aspect
Invert aspect ratio that was used to perspective project the vertices (1/fov)

G3DPolyNormal normal
The plane equation in camera space of this polygon. @@@ BAD NAME

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