498 lines
14 KiB
C++
498 lines
14 KiB
C++
// main.cxx -- top level construction routines
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//
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// Written by Curtis Olson, started March 1999.
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//
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// Copyright (C) 1999 Curtis L. Olson - curt@flightgear.org
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#include <sys/types.h> // for directory reading
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#include <dirent.h> // for directory reading
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#include <Bucket/newbucket.hxx>
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#include <Include/fg_constants.h>
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#include <Math/mat3.h>
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#include <Debug/logstream.hxx>
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#include <Array/array.hxx>
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#include <Clipper/clipper.hxx>
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#include <GenOutput/genobj.hxx>
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#include <Match/match.hxx>
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#include <Triangulate/triangle.hxx>
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#include "construct.hxx"
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// do actual scan of directory and loading of files
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int actual_load_polys( const string& dir, FGConstruct& c, FGClipper& clipper ) {
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int counter = 0;
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string base = c.get_bucket().gen_base_path();
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string tile_str = c.get_bucket().gen_index_str();
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string ext;
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DIR *d;
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struct dirent *de;
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if ( (d = opendir( dir.c_str() )) == NULL ) {
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cout << "cannot open directory " << dir << "\n";
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return 0;
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}
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// load all matching polygon files
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string file, f_index, full_path;
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int pos;
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while ( (de = readdir(d)) != NULL ) {
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file = de->d_name;
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pos = file.find(".");
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f_index = file.substr(0, pos);
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if ( tile_str == f_index ) {
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ext = file.substr(pos + 1);
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cout << file << " " << f_index << " '" << ext << "'" << endl;
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full_path = dir + "/" + file;
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if ( (ext == "dem") || (ext == "dem.gz") ) {
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// skip
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} else {
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cout << "ext = '" << ext << "'" << endl;
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clipper.load_polys( full_path );
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++counter;
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}
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}
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}
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return counter;
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}
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// load all 2d polygons matching the specified base path and clip
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// against each other to resolve any overlaps
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int load_polys( FGConstruct& c ) {
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FGClipper clipper;
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string base = c.get_bucket().gen_base_path();
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int result;
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// initialize clipper
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clipper.init();
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// load airports
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string poly_path = c.get_work_base() + ".apt" + "/Scenery/" + base;
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cout << "poly_path = " << poly_path << endl;
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result = actual_load_polys( poly_path, c, clipper );
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cout << " loaded " << result << " polys" << endl;
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// load hydro
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poly_path = c.get_work_base() + ".hydro" + "/Scenery/" + base;
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cout << "poly_path = " << poly_path << endl;
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result = actual_load_polys( poly_path, c, clipper );
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cout << " loaded " << result << " polys" << endl;
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point2d min, max;
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min.x = c.get_bucket().get_center_lon() - 0.5 * c.get_bucket().get_width();
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min.y = c.get_bucket().get_center_lat() - 0.5 * c.get_bucket().get_height();
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max.x = c.get_bucket().get_center_lon() + 0.5 * c.get_bucket().get_width();
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max.y = c.get_bucket().get_center_lat() + 0.5 * c.get_bucket().get_height();
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// do clipping
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cout << "clipping polygons" << endl;
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clipper.clip_all(min, max);
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// update main data repository
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c.set_clipped_polys( clipper.get_polys_clipped() );
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return 1;
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}
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// load regular grid of elevation data (dem based), return list of
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// fitted nodes
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int load_dem( FGConstruct& c, FGArray& array) {
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point_list result;
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string base = c.get_bucket().gen_base_path();
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string dem_path = c.get_work_base() + ".dem" + "/Scenery/" + base
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+ "/" + c.get_bucket().gen_index_str() + ".dem";
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cout << "dem_path = " << dem_path << endl;
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if ( ! array.open(dem_path) ) {
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cout << "ERROR: cannot open " << dem_path << endl;
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}
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FGBucket b = c.get_bucket();
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array.parse( b );
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return 1;
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}
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// fit dem nodes, return number of fitted nodes
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int fit_dem(FGArray& array, int error) {
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return array.fit( error );
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}
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// triangulate the data for each polygon
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void do_triangulate( FGConstruct& c, const FGArray& array,
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FGTriangle& t ) {
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// first we need to consolidate the points of the DEM fit list and
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// all the polygons into a more "Triangle" friendly format
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point_list corner_list = array.get_corner_node_list();
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point_list fit_list = array.get_fit_node_list();
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FGgpcPolyList gpc_polys = c.get_clipped_polys();
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cout << "ready to build node list and polygons" << endl;
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t.build( corner_list, fit_list, gpc_polys );
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cout << "done building node list and polygons" << endl;
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cout << "ready to do triangulation" << endl;
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t.run_triangulate();
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cout << "finished triangulation" << endl;
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}
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// build the wgs-84 point list (and fix the elevations of the geodetic
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// nodes)
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static void fix_point_heights( FGConstruct& c, const FGArray& array ) {
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point_list geod_nodes;
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point_list wgs84_nodes;
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cout << "fixing node heights and generating wgs84 list" << endl;
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Point3D geod, radians, cart;
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point_list raw_nodes = c.get_tri_nodes().get_node_list();
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point_list_iterator current = raw_nodes.begin();
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point_list_iterator last = raw_nodes.end();
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for ( ; current != last; ++current ) {
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geod = *current;
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geod.setz( array.interpolate_altitude( geod.x() * 3600.0,
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geod.y() * 3600.0 ) );
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// convert to radians
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radians = Point3D( geod.x() * DEG_TO_RAD,
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geod.y() * DEG_TO_RAD,
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geod.z() );
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cart = fgGeodToCart(radians);
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// cout << cart << endl;
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geod_nodes.push_back(geod);
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wgs84_nodes.push_back(cart);
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}
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c.set_geod_nodes( geod_nodes );
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c.set_wgs84_nodes( wgs84_nodes );
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}
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// build the node -> element (triangle) reverse lookup table. there
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// is an entry for each point containing a list of all the triangles
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// that share that point.
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static belongs_to_list gen_node_ele_lookup_table( FGConstruct& c ) {
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belongs_to_list reverse_ele_lookup;
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reverse_ele_lookup.clear();
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int_list ele_list;
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ele_list.clear();
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// initialize reverse_ele_lookup structure by creating an empty
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// list for each point
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point_list wgs84_nodes = c.get_wgs84_nodes();
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const_point_list_iterator w_current = wgs84_nodes.begin();
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const_point_list_iterator w_last = wgs84_nodes.end();
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for ( ; w_current != w_last; ++w_current ) {
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reverse_ele_lookup.push_back( ele_list );
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}
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// traverse triangle structure building reverse lookup table
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triele_list tri_elements = c.get_tri_elements();
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const_triele_list_iterator current = tri_elements.begin();
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const_triele_list_iterator last = tri_elements.end();
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int counter = 0;
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for ( ; current != last; ++current ) {
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reverse_ele_lookup[ current->get_n1() ].push_back( counter );
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reverse_ele_lookup[ current->get_n2() ].push_back( counter );
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reverse_ele_lookup[ current->get_n3() ].push_back( counter );
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++counter;
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}
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return reverse_ele_lookup;
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}
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// caclulate the normal for the specified triangle face
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static Point3D calc_normal( FGConstruct& c, int i ) {
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double v1[3], v2[3], normal[3];
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double temp;
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point_list wgs84_nodes = c.get_wgs84_nodes();
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triele_list tri_elements = c.get_tri_elements();
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Point3D p1 = wgs84_nodes[ tri_elements[i].get_n1() ];
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Point3D p2 = wgs84_nodes[ tri_elements[i].get_n2() ];
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Point3D p3 = wgs84_nodes[ tri_elements[i].get_n3() ];
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v1[0] = p2.x() - p1.x(); v1[1] = p2.y() - p1.y(); v1[2] = p2.z() - p1.z();
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v2[0] = p3.x() - p1.x(); v2[1] = p3.y() - p1.y(); v2[2] = p3.z() - p1.z();
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MAT3cross_product(normal, v1, v2);
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MAT3_NORMALIZE_VEC(normal,temp);
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return Point3D( normal[0], normal[1], normal[2] );
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}
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// build the face normal list
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static point_list gen_face_normals( FGConstruct& c ) {
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point_list face_normals;
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// traverse triangle structure building the face normal table
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cout << "calculating face normals" << endl;
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triele_list tri_elements = c.get_tri_elements();
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for ( int i = 0; i < (int)tri_elements.size(); i++ ) {
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// cout << calc_normal( i ) << endl;
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face_normals.push_back( calc_normal( c, i ) );
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}
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return face_normals;
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}
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// calculate the normals for each point in wgs84_nodes
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static point_list gen_point_normals( FGConstruct& c ) {
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point_list point_normals;
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Point3D normal;
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cout << "caculating node normals" << endl;
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point_list wgs84_nodes = c.get_wgs84_nodes();
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belongs_to_list reverse_ele_lookup = c.get_reverse_ele_lookup();
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point_list face_normals = c.get_face_normals();
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// for each node
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for ( int i = 0; i < (int)wgs84_nodes.size(); ++i ) {
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int_list tri_list = reverse_ele_lookup[i];
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int_list_iterator current = tri_list.begin();
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int_list_iterator last = tri_list.end();
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Point3D average( 0.0 );
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// for each triangle that shares this node
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for ( ; current != last; ++current ) {
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normal = face_normals[ *current ];
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average += normal;
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// cout << normal << endl;
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}
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average /= tri_list.size();
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// cout << "average = " << average << endl;
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point_normals.push_back( average );
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}
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return point_normals;
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}
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// generate the flight gear scenery file
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void do_output( FGConstruct& c, const FGTriangle& t,
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const FGArray& array, FGGenOutput& output ) {
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output.build( c );
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output.write( c );
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}
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// master construction routine
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void construct_tile( FGConstruct& c ) {
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cout << "Construct tile, bucket = " << c.get_bucket() << endl;
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// fit with ever increasing error tolerance until we produce <=
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// 80% of max nodes. We should really have the sim end handle
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// arbitrarily complex tiles.
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bool acceptable = false;
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double error = 200.0;
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int count = 0;
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// load and clip 2d polygon data
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load_polys( c );
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// load grid of elevation data (dem)
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FGArray array;
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load_dem( c, array );
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FGTriangle t;
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while ( ! acceptable ) {
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// do a least squares fit of the (dem) data with the given
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// error tolerance
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array.fit( error );
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// triangulate the data for each polygon
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do_triangulate( c, array, t );
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acceptable = true;
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count = t.get_out_nodes_size();
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if ( (count < c.get_min_nodes()) && (error >= 25.0) ) {
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// reduce error tolerance until number of points exceeds the
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// minimum threshold
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cout << "produced too few nodes ..." << endl;
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acceptable = false;
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error /= 1.5;
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cout << "Setting error to " << error << " and retrying fit."
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<< endl;
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}
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if ( (count > c.get_max_nodes()) && (error <= 1000.0) ) {
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// increase error tolerance until number of points drops below
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// the maximum threshold
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cout << "produced too many nodes ..." << endl;
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acceptable = false;
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error *= 1.5;
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cout << "Setting error to " << error << " and retrying fit."
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<< endl;
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}
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}
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cout << "finished fit with error = " << error << " node count = "
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<< count << endl;
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// save the results of the triangulation
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c.set_tri_nodes( t.get_out_nodes() );
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c.set_tri_elements( t.get_elelist() );
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c.set_tri_segs( t.get_out_segs() );
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// calculate wgs84 (cartesian) form of node list
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fix_point_heights( c, array );
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// build the node -> element (triangle) reverse lookup table
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c.set_reverse_ele_lookup( gen_node_ele_lookup_table( c ) );
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// build the face normal list
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c.set_face_normals( gen_face_normals( c ) );
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// calculate the normals for each point in wgs84_nodes
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c.set_point_normals( gen_point_normals( c ) );
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// match tile edges with any neighbor tiles that have already been
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// generated
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FGMatch m;
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m.load_neighbor_shared( c );
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m.split_tile( c );
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m.write_shared( c );
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// generate the output
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FGGenOutput output;
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do_output( c, t, array, output );
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}
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main(int argc, char **argv) {
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double lon, lat;
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fglog().setLogLevels( FG_ALL, FG_DEBUG );
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if ( argc != 3 ) {
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cout << "Usage: " << argv[0] << " <work_base> <output_base>" << endl;
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exit(-1);
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}
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// main construction data management class
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FGConstruct c;
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c.set_work_base( argv[1] );
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c.set_output_base( argv[2] );
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c.set_min_nodes( 50 );
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c.set_max_nodes( (int)(FG_MAX_NODES * 0.8) );
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lon = -146.248360; lat = 61.133950; // PAVD (Valdez, AK)
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// lon = -110.664244; lat = 33.352890; // P13
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// lon = -93.211389; lat = 45.145000; // KANE
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// lon = -92.486188; lat = 44.590190; // KRGK
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// lon = -89.7446823; lat= 29.314495;
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// lon = -122.488090; lat = 42.743183; // 64S
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// lon = -114.861097; lat = 35.947480; // 61B
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// lon = -112.012175; lat = 41.195944; // KOGD
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// lon = -90.757128; lat = 46.790212; // WI32
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// lon = -122.220717; lat = 37.721291; // KOAK
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// lon = -111.721477; lat = 40.215641; // KPVU
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// lon = -122.309313; lat = 47.448982; // KSEA
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// lon = -148.798131; lat = 63.645099; // AK06 (Danali, AK)
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// lon = -92.5; lat = 47.5; // Marsh test (northern MN)
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// lon = -111.977773; lat = 40.788388; // KSLC
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// lon = -121.914; lat = 42.5655; // TEST (Oregon SW of Crater)
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// lon = -76.201239; lat = 36.894606; // KORF (Norfolk, Virginia)
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double min_x = lon - 3;
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double min_y = lat - 1;
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FGBucket b_min( min_x, min_y );
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FGBucket b_max( lon + 3, lat + 1 );
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FGBucket b_start(566777L);
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bool do_tile = false;
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// FGBucket b_omit(-1L);
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// FGBucket b(1122504L);
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FGBucket b(-146.248360, 61.133950);
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c.set_bucket( b );
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construct_tile( c );
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exit(0);
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if ( b_min == b_max ) {
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c.set_bucket( b_min );
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construct_tile( c );
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} else {
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FGBucket b_cur;
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int dx, dy, i, j;
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fgBucketDiff(b_min, b_max, &dx, &dy);
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cout << " construction area spans tile boundaries" << endl;
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cout << " dx = " << dx << " dy = " << dy << endl;
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for ( j = 0; j <= dy; j++ ) {
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for ( i = 0; i <= dx; i++ ) {
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b_cur = fgBucketOffset(min_x, min_y, i, j);
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if ( b_cur == b_start ) {
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do_tile = true;
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}
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if ( do_tile ) {
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c.set_bucket( b_cur );
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construct_tile( c );
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} else {
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cout << "skipping " << b_cur << endl;
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}
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}
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}
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// string answer; cin >> answer;
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}
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}
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