eb482c7d4b
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2128 178a84e3-b1eb-0310-8ba1-8eac791a3b58
62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
// $Id$
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//
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// SuperTuxKart - a fun racing game with go-kart
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// Copyright (C) 2004 Steve Baker <sjbaker1@airmail.net>
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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
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// as published by the Free Software Foundation; either version 3
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// of the 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,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#include <plib/ssg.h>
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#include "isect.hpp"
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float getHeightAndNormal(ssgBranch* branch, sgVec3 my_position, sgVec3 normal)
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{
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/* Look for the nearest polygon *beneath* my_position */
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ssgHit *results ;
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float hot ; /* H.O.T == Height Of Terrain */
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sgVec3 HOTvec ;
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sgMat4 invmat ;
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sgMakeIdentMat4 ( invmat ) ;
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invmat[3][0] = - my_position [0] ;
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invmat[3][1] = - my_position [1] ;
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invmat[3][2] = 0.0 ;
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sgSetVec3 ( HOTvec, 0.0f, 0.0f, my_position [ 2 ] ) ;
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const int NUM_HITS = ssgHOT (branch, HOTvec, invmat, &results ) ;
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hot = - FLT_MAX ;
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for ( int i = 0 ; i < NUM_HITS ; i++ )
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{
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ssgHit *h = &results [ i ] ;
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float hgt = - h->plane[3] / h->plane[2] ;
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if ( hgt >= hot )
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{
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hot = hgt ;
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if ( normal != NULL )
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sgCopyVec3 ( normal, h->plane ) ;
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}
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}
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return hot ;
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}
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