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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