131 lines
3.6 KiB
C++
131 lines
3.6 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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#ifndef _GENOBJ_HXX
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#define _GENOBJ_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <Include/compiler.h>
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#include STL_STRING
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#include <Bucket/newbucket.hxx>
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#include <Math/fg_geodesy.hxx>
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#include <Math/point3d.hxx>
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#include <Combine/genfans.hxx>
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#include <Main/construct_types.hxx>
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#include <Triangulate/triangle.hxx>
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FG_USING_STD(string);
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FG_USING_STD(vector);
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typedef vector < int_list > belongs_to_list;
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typedef belongs_to_list::iterator belongs_to_list_iterator;
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typedef belongs_to_list::const_iterator belongs_to_list_tripoly_iterator;
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class FGGenOutput {
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private:
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// node list in geodetic coordinats
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point_list geod_nodes;
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// node list in cartesian coords (wgs84 model)
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point_list wgs84_nodes;
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// face normal list (for flat shading)
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point_list face_normals;
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// normal list (for each point) in cart coords (for smooth
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// shading)
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point_list point_normals;
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// triangles (by index into point list)
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triele_list tri_elements;
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// fan list
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fan_list fans[FG_MAX_AREA_TYPES];
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// for each node, a list of triangle indices that contain this node
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belongs_to_list reverse_ele_lookup;
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// global bounding sphere
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Point3D gbs_center;
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double gbs_radius;
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// build the wgs-84 point list
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void gen_wgs84_points( const FGArray& array );
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// build the node -> element (triangle) reverse lookup table.
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// there is an entry for each point containing a list of all the
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// triangles that share that point.
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void gen_node_ele_lookup_table();
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// calculate the normals for each point in wgs84_nodes
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void gen_normals();
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// build the face normal list
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void gen_face_normals();
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// caclulate the normal for the specified triangle face
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Point3D calc_normal( int i );
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// calculate the global bounding sphere. Center is the average of
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// the points.
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void calc_gbs();
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// caclulate the bounding sphere for a list of triangle faces
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void calc_group_bounding_sphere( const fan_list& fans,
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Point3D *center, double *radius );
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// caclulate the bounding sphere for the specified triangle face
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void calc_bounding_sphere( const FGTriEle& t,
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Point3D *center, double *radius );
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public:
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// Constructor && Destructor
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inline FGGenOutput() { }
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inline ~FGGenOutput() { }
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// build the necessary output structures based on the
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// triangulation data
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int build( const FGArray& array, const FGTriangle& t );
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// write out the fgfs scenery file
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int write( const string& base, const FGBucket& b );
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};
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#endif // _GENOBJ_HXX
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