86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
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// 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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// (Log is kept at end of this file)
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#include "genobj.hxx"
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// Calculate the global bounding sphere from all the input points.
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// Center is the average of the points.
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static void calc_gbs( const trinode_list& nodelist, Point3D *center,
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double *radius )
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{
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double x = 0;
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double y = 0;
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double z = 0;
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double dist_squared;
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double radius_squared = 0;
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const_trinode_list_iterator current = nodelist.begin();
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const_trinode_list_iterator last = nodelist.end();
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for ( ; current != last; ++current ) {
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x += current->x();
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y += current->y();
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z += current->z();
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}
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x /= nodelist.size();
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y /= nodelist.size();
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z /= nodelist.size();
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*center = Point3D(x, y, z);
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current = nodelist.begin();
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for ( ; current != last; ++current ) {
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dist_squared = 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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*radius = sqrt(radius_squared);
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}
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// generate the flight gear format from the triangulation
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int fgGenOutput( const FGTriangle& t ) {
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Point3D gbs;
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double gradius;
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FGTriNodes trinodes = t.get_out_nodes();
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trinode_list nodelist = trinodes.get_node_list();
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calc_gbs( nodelist, &gbs, &gradius );
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cout << "center = " << gbs << " radius = " << gradius << endl;
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return 1;
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}
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// $Log$
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// Revision 1.1 1999/03/22 23:51:51 curt
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// Initial revision.
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//
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