I want to add targets in a multiplayer fgfs session from data
generated by an external system, and would like some guidance on
the coordinate system.
The data exchanged in the multiplayer frames consist of
sgMat4 PlayerPos;
which is defined in plib as
typedef SGfloat sgMat4 [4][4] ;
which has some elaborate conversion routines, such as
void sgMakeCoordMat4 ( sgMat4 m, const SGfloat x, const SGfloat y, const SGfloat z,
const SGfloat h, const SGfloat p, const SGfloat r )
However, I couldn't find a description of these coordinates.
Are the inputs to sgMakeCoordMat4 in lat/lng/alt or in
geocentric x, y, z measured from the center of the earth? Are
there plib (or fgfs) routines to convert from lat/lng/alt to
sgMat4?
Is there any fm that describes this that I should rtfm?
Wendell
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