+ sgdMat4 GEOC_UP;
+ sgdVec3 geoc_up;
+ sgdMakeRotMat4( GEOC_UP, lon, 0.0, -lat_geoc * SGD_RADIANS_TO_DEGREES );
+ sgdSetVec3( geoc_up, GEOC_UP[0][0], GEOC_UP[0][1], GEOC_UP[0][2] );
+ cout << " geoc up = " << geoc_up[0] << ", " << geoc_up[1] << ", "
+ << geoc_up[2] << endl;
+