- modified grid size from 1 cm to 1 mm

- snap runway and pavement polys to grid after adding slivers.

src/Airports/GenAirports850/airport.cxx

@@ -770,21 +770,6 @@ void Airport::BuildBtg(const string& root, const string_list& elev_src )
     gettimeofday(&log_time, NULL);
     SG_LOG( SG_GENERAL, SG_ALERT, "Finished adding intermediate nodes for " << icao << " at " << ctime(&log_time.tv_sec) );
 
-    // One more pass to try to get rid of other yukky stuff
-    for ( unsigned int k = 0; k < rwy_polys.size(); ++k ) 
-    {
-    	TGPolygon poly = rwy_polys[k].get_poly();
-        poly = snap(poly, gSnap);
-    	rwy_polys[k].set_poly( poly );
-    }
-
-    for ( unsigned int k = 0; k < pvmt_polys.size(); ++k ) 
-    {
-    	TGPolygon poly = pvmt_polys[k].get_poly();
-        poly = snap(poly, gSnap);
-    	pvmt_polys[k].set_poly( poly );
-    }
-
     for ( unsigned int k = 0; k < line_polys.size(); ++k ) 
     {
     	TGPolygon poly = line_polys[k].get_poly();
@@ -819,6 +804,22 @@ void Airport::BuildBtg(const string& root, const string_list& elev_src )
     merge_slivers( rwy_polys, slivers );
     merge_slivers( pvmt_polys, slivers );
 
+    // Then snap rwy and pavement to grid (was done right after adding intermediate nodes...)
+    for ( unsigned int k = 0; k < rwy_polys.size(); ++k ) 
+    {
+    	TGPolygon poly = rwy_polys[k].get_poly();
+        poly = snap(poly, gSnap);
+        poly = remove_dups( poly );
+    	rwy_polys[k].set_poly( poly );
+    }
+    for ( unsigned int k = 0; k < pvmt_polys.size(); ++k ) 
+    {
+    	TGPolygon poly = pvmt_polys[k].get_poly();
+        poly = snap(poly, gSnap);
+        poly = remove_dups( poly );
+    	pvmt_polys[k].set_poly( poly );
+    }
+
     gettimeofday(&cleanup_end, NULL);
     timersub(&cleanup_end, &cleanup_start, &cleanup_time);
 

src/Airports/GenAirports850/helipad.cxx

@@ -63,14 +63,12 @@ void Helipad::gen_helipad( const TGPolygon& runway,
     Point3D a2 = runway.get_pt(0, 0);
     Point3D a3 = runway.get_pt(0, 3);
 
-#if 0
     if ( startl_pct > 0.0 ) {
         startl_pct -= nudge * SG_EPSILON;
     }
     if ( endl_pct < 1.0 ) {
         endl_pct += nudge * SG_EPSILON;
     }
-#endif
 
     if ( startl_pct < 0.0 ) {
         startl_pct = 0.0;
@@ -85,7 +83,6 @@ void Helipad::gen_helipad( const TGPolygon& runway,
     // with our polygon clipping code.  This attempts to compensate
     // for that by nudging the areas a bit bigger so we don't end up
     // with polygon slivers.
-#if 0
     if ( startw_pct > 0.0 || endw_pct < 1.0 ) {
         if ( startw_pct > 0.0 ) {
             startw_pct -= nudge * SG_EPSILON;
@@ -94,7 +91,6 @@ void Helipad::gen_helipad( const TGPolygon& runway,
             endw_pct += nudge * SG_EPSILON;
         }
     }
-#endif
 
     SG_LOG(SG_GENERAL, SG_DEBUG, "start len % = " << startl_pct
            << " end len % = " << endl_pct);

src/Airports/GenAirports850/main.cxx

@@ -112,9 +112,9 @@ static void help( int argc, char **argv, const string_list& elev_src ) {
 }
 
 // TODO: where do these belong
-int nudge = 0;
+int nudge = 10;
 double slope_max = 0.2;
-double gSnap = 0.0000001;
+double gSnap = 0.00000001;      // approx 1 mm
 
 int main(int argc, char **argv)
 {

src/Airports/GenAirports850/rwy_gen.cxx

@@ -109,14 +109,12 @@ void Runway::gen_runway_section( const TGPolygon& runway,
     Point3D a2 = runway.get_pt(0, 0);
     Point3D a3 = runway.get_pt(0, 3);
 
-#if 0
     if ( startl_pct > 0.0 ) {
         startl_pct -= nudge * SG_EPSILON;
     }
     if ( endl_pct < 1.0 ) {
         endl_pct += nudge * SG_EPSILON;
     }
-#endif
 
     if ( startl_pct < 0.0 ) {
         startl_pct = 0.0;
@@ -131,7 +129,6 @@ void Runway::gen_runway_section( const TGPolygon& runway,
     // with our polygon clipping code.  This attempts to compensate
     // for that by nudging the areas a bit bigger so we don't end up
     // with polygon slivers.
-#if 0
     if ( startw_pct > 0.0 || endw_pct < 1.0 ) {
         if ( startw_pct > 0.0 ) {
             startw_pct -= nudge * SG_EPSILON;
@@ -140,7 +137,6 @@ void Runway::gen_runway_section( const TGPolygon& runway,
             endw_pct += nudge * SG_EPSILON;
         }
     }
-#endif
 
     SG_LOG(SG_GENERAL, SG_DEBUG, "start len % = " << startl_pct
            << " end len % = " << endl_pct);