59a35fbe8a
Added adjacent triangle area weighting for calculating vertices of nodes. Check for super small or degenerate triangles which could blow up our face normal calculations.
427 lines
12 KiB
C++
427 lines
12 KiB
C++
// genobj.hxx -- Generate the flight gear "obj" file format from the
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// triangle output
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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 <time.h>
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#include <simgear/misc/texcoord.hxx>
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#include <Polygon/names.hxx>
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#include "scenery_version.hxx"
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#ifdef _MSC_VER
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# include <win32/mkdir.hpp>
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#endif
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#include "genobj.hxx"
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FG_USING_STD(cout);
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FG_USING_STD(endl);
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// calculate the global bounding sphere. Center is the center of the
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// tile and zero elevation
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void FGGenOutput::calc_gbs( FGConstruct& c ) {
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double dist_squared;
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double radius_squared = 0;
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FGBucket b = c.get_bucket();
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Point3D p( b.get_center_lon() * DEG_TO_RAD,
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b.get_center_lat() * DEG_TO_RAD,
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0 );
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gbs_center = sgGeodToCart(p);
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point_list wgs84_nodes = c.get_wgs84_nodes();
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const_point_list_iterator current = wgs84_nodes.begin();
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const_point_list_iterator last = wgs84_nodes.end();
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for ( ; current != last; ++current ) {
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dist_squared = gbs_center.distance3Dsquared(*current);
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if ( dist_squared > radius_squared ) {
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radius_squared = dist_squared;
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}
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}
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gbs_radius = sqrt(radius_squared);
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}
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#if 0
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#define FG_STANDARD_TEXTURE_DIMENSION 1000.0 // meters
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// traverse the specified fan and attempt to calculate "none
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// stretching" texture coordinates
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int_list FGGenOutput::calc_tex_coords( FGConstruct& c, point_list geod_nodes,
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int_list fan )
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{
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// cout << "calculating texture coordinates for a specific fan of size = "
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// << fan.size() << endl;
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FGBucket b = c.get_bucket();
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double clat = b.get_center_lat();
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double clat_rad = clat * DEG_TO_RAD;
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double cos_lat = cos( clat_rad );
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double local_radius = cos_lat * EQUATORIAL_RADIUS_M;
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double local_perimeter = 2.0 * local_radius * FG_PI;
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double degree_width = local_perimeter / 360.0;
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// cout << "clat = " << clat << endl;
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// cout << "clat (radians) = " << clat_rad << endl;
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// cout << "cos(lat) = " << cos_lat << endl;
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// cout << "local_radius = " << local_radius << endl;
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// cout << "local_perimeter = " << local_perimeter << endl;
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// cout << "degree_width = " << degree_width << endl;
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double perimeter = 2.0 * EQUATORIAL_RADIUS_M * FG_PI;
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double degree_height = perimeter / 360.0;
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// cout << "degree_height = " << degree_height << endl;
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// find min/max of fan
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Point3D min, max, p, t;
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bool first = true;
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for ( int i = 0; i < (int)fan.size(); ++i ) {
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p = geod_nodes[ fan[i] ];
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t.setx( p.x() * ( degree_width / FG_STANDARD_TEXTURE_DIMENSION ) );
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t.sety( p.y() * ( degree_height / FG_STANDARD_TEXTURE_DIMENSION ) );
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if ( first ) {
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min = max = t;
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first = false;
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} else {
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if ( t.x() < min.x() ) {
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min.setx( t.x() );
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}
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if ( t.y() < min.y() ) {
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min.sety( t.y() );
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}
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if ( t.x() > max.x() ) {
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max.setx( t.x() );
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}
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if ( t.y() > max.y() ) {
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max.sety( t.y() );
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}
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}
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}
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min.setx( (double)( (int)min.x() - 1 ) );
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min.sety( (double)( (int)min.y() - 1 ) );
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// cout << "found min = " << min << endl;
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// generate tex_list
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Point3D shifted_t;
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int index;
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int_list tex;
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tex.clear();
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for ( int i = 0; i < (int)fan.size(); ++i ) {
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p = geod_nodes[ fan[i] ];
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t.setx( p.x() * ( degree_width / FG_STANDARD_TEXTURE_DIMENSION ) );
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t.sety( p.y() * ( degree_height / FG_STANDARD_TEXTURE_DIMENSION ) );
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shifted_t = t - min;
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if ( shifted_t.x() < FG_EPSILON ) {
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shifted_t.setx( 0.0 );
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}
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if ( shifted_t.y() < FG_EPSILON ) {
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shifted_t.sety( 0.0 );
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}
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shifted_t.setz( 0.0 );
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// cout << "shifted_t = " << shifted_t << endl;
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index = tex_coords.unique_add( shifted_t );
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tex.push_back( index );
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}
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return tex;
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}
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#endif
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// build the necessary output structures based on the triangulation
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// data
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int FGGenOutput::build( FGConstruct& c ) {
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int i, j;
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FGTriNodes trinodes = c.get_tri_nodes();
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// copy the geodetic node list into this class
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geod_nodes = trinodes.get_node_list();
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// copy the triangle list into this class
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tri_elements = c.get_tri_elements();
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// build the trifan list
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cout << "total triangles = " << tri_elements.size() << endl;
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FGGenFans f;
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for ( i = 0; i < FG_MAX_AREA_TYPES; ++i ) {
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triele_list area_tris;
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area_tris.erase( area_tris.begin(), area_tris.end() );
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const_triele_list_iterator t_current = tri_elements.begin();
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const_triele_list_iterator t_last = tri_elements.end();
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for ( ; t_current != t_last; ++t_current ) {
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if ( (int)t_current->get_attribute() == i ) {
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area_tris.push_back( *t_current );
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}
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}
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if ( (int)area_tris.size() > 0 ) {
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cout << "generating fans for area = " << i << endl;
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fans[i] = f.greedy_build( area_tris );
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}
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}
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// build the texture coordinate list and make a parallel structure
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// to the fan list for pointers into the texture list
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cout << "calculating texture coordinates" << endl;
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tex_coords.clear();
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for ( i = 0; i < FG_MAX_AREA_TYPES; ++i ) {
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for ( j = 0; j < (int)fans[i].size(); ++j ) {
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// int_list t_list = calc_tex_coords( c, geod_nodes, fans[i][j] );
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// cout << fans[i][j].size() << " === "
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// << t_list.size() << endl;
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point_list tp_list = calc_tex_coords( c.get_bucket(),
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geod_nodes, fans[i][j] );
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int_list ti_list;
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ti_list.clear();
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for ( int k = 0; k < (int)tp_list.size(); ++k ) {
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int index = tex_coords.simple_add( tp_list[k] );
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ti_list.push_back( index );
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}
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textures[i].push_back( ti_list );
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}
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}
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// calculate the global bounding sphere
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calc_gbs( c );
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cout << "center = " << gbs_center << " radius = " << gbs_radius << endl;
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return 1;
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}
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// caclulate the bounding sphere for a list of triangle faces
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void FGGenOutput::calc_group_bounding_sphere( FGConstruct& c,
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const opt_list& fans,
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Point3D *center, double *radius )
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{
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cout << "calculate group bounding sphere for " << fans.size() << " fans."
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<< endl;
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point_list wgs84_nodes = c.get_wgs84_nodes();
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// generate a list of unique points from the triangle list
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FGTriNodes nodes;
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const_opt_list_iterator f_current = fans.begin();
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const_opt_list_iterator f_last = fans.end();
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for ( ; f_current != f_last; ++f_current ) {
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const_int_list_iterator i_current = f_current->begin();
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const_int_list_iterator i_last = f_current->end();
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for ( ; i_current != i_last; ++i_current ) {
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Point3D p1 = wgs84_nodes[ *i_current ];
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nodes.unique_add(p1);
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}
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}
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// find average of point list
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*center = Point3D( 0.0 );
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point_list points = nodes.get_node_list();
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// cout << "found " << points.size() << " unique nodes" << endl;
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point_list_iterator p_current = points.begin();
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point_list_iterator p_last = points.end();
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for ( ; p_current != p_last; ++p_current ) {
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*center += *p_current;
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}
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*center /= points.size();
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// find max radius
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double dist_squared;
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double max_squared = 0;
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p_current = points.begin();
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p_last = points.end();
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for ( ; p_current != p_last; ++p_current ) {
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dist_squared = (*center).distance3Dsquared(*p_current);
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if ( dist_squared > max_squared ) {
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max_squared = dist_squared;
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}
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}
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*radius = sqrt(max_squared);
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}
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// caclulate the bounding sphere for the specified triangle face
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void FGGenOutput::calc_bounding_sphere( FGConstruct& c, const FGTriEle& t,
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Point3D *center, double *radius )
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{
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point_list wgs84_nodes = c.get_wgs84_nodes();
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*center = Point3D( 0.0 );
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Point3D p1 = wgs84_nodes[ t.get_n1() ];
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Point3D p2 = wgs84_nodes[ t.get_n2() ];
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Point3D p3 = wgs84_nodes[ t.get_n3() ];
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*center = p1 + p2 + p3;
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*center /= 3;
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double dist_squared;
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double max_squared = 0;
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dist_squared = (*center).distance3Dsquared(p1);
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if ( dist_squared > max_squared ) {
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max_squared = dist_squared;
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}
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dist_squared = (*center).distance3Dsquared(p2);
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if ( dist_squared > max_squared ) {
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max_squared = dist_squared;
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}
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dist_squared = (*center).distance3Dsquared(p3);
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if ( dist_squared > max_squared ) {
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max_squared = dist_squared;
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}
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*radius = sqrt(max_squared);
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}
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// write out the fgfs scenery file
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int FGGenOutput::write( FGConstruct &c ) {
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Point3D p;
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int i;
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string base = c.get_output_base();
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FGBucket b = c.get_bucket();
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string dir = base + "/Scenery/" + b.gen_base_path();
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#ifdef _MSCVER
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fg_mkdir( dir.c_str );
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#else
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string command = "mkdir -p " + dir;
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system(command.c_str());
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#endif
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string file = dir + "/" + b.gen_index_str();
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cout << "Output file = " << file << endl;
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FILE *fp;
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if ( (fp = fopen( file.c_str(), "w" )) == NULL ) {
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cout << "ERROR: opening " << file << " for writing!" << endl;
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exit(-1);
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}
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// write headers
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fprintf(fp, "# FGFS Scenery\n");
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fprintf(fp, "# Version %s\n", FG_SCENERY_FILE_FORMAT);
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time_t calendar_time = time(NULL);
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struct tm *local_tm;
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local_tm = localtime( &calendar_time );
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char time_str[256];
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strftime( time_str, 256, "%a %b %d %H:%M:%S %Z %Y", local_tm);
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fprintf(fp, "# Created %s\n", time_str );
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fprintf(fp, "\n");
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// write global bounding sphere
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fprintf(fp, "# gbs %.5f %.5f %.5f %.2f\n",
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gbs_center.x(), gbs_center.y(), gbs_center.z(), gbs_radius);
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fprintf(fp, "\n");
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// write nodes
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point_list wgs84_nodes = c.get_wgs84_nodes();
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cout << "writing nodes = " << wgs84_nodes.size() << endl;
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fprintf(fp, "# vertex list\n");
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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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p = *w_current - gbs_center;
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fprintf(fp, "v %.5f %.5f %.5f\n", p.x(), p.y(), p.z());
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}
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fprintf(fp, "\n");
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// write vertex normals
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point_list point_normals = c.get_point_normals();
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cout << "writing normals = " << point_normals.size() << endl;
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fprintf(fp, "# vertex normal list\n");
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const_point_list_iterator n_current = point_normals.begin();
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const_point_list_iterator n_last = point_normals.end();
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for ( ; n_current != n_last; ++n_current ) {
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p = *n_current;
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fprintf(fp, "vn %.5f %.5f %.5f\n", p.x(), p.y(), p.z());
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}
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fprintf(fp, "\n");
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// write texture coordinates
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point_list tex_coord_list = tex_coords.get_node_list();
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fprintf(fp, "# texture coordinate list\n");
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for ( i = 0; i < (int)tex_coord_list.size(); ++i ) {
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p = tex_coord_list[i];
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fprintf(fp, "vt %.5f %.5f\n", p.x(), p.y());
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}
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fprintf(fp, "\n");
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// write triangles (grouped by type for now)
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Point3D center;
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double radius;
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fprintf(fp, "# triangle groups\n");
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fprintf(fp, "\n");
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int total_tris = 0;
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for ( i = 0; i < FG_MAX_AREA_TYPES; ++i ) {
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if ( (int)fans[i].size() > 0 ) {
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string attr_name = get_area_name( (AreaType)i );
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calc_group_bounding_sphere( c, fans[i], ¢er, &radius );
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cout << "writing " << (int)fans[i].size() << " fans for "
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<< attr_name << endl;
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fprintf(fp, "# usemtl %s\n", attr_name.c_str() );
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fprintf(fp, "# bs %.4f %.4f %.4f %.2f\n",
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center.x(), center.y(), center.z(), radius);
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for ( int j = 0; j < (int)fans[i].size(); ++j ) {
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fprintf( fp, "tf" );
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total_tris += fans[i][j].size() - 2;
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for ( int k = 0; k < (int)fans[i][j].size(); ++k ) {
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fprintf( fp, " %d/%d", fans[i][j][k], textures[i][j][k] );
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}
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fprintf( fp, "\n" );
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}
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fprintf( fp, "\n" );
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}
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}
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cout << "wrote " << total_tris << " tris to output file" << endl;
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fclose(fp);
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command = "gzip --force --best " + file;
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system(command.c_str());
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return 1;
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}
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