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64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/*
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===========================================================================
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Copyright (C) 1999 - 2005, Id Software, Inc.
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Copyright (C) 2000 - 2013, Raven Software, Inc.
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Copyright (C) 2001 - 2013, Activision, Inc.
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Copyright (C) 2013 - 2015, OpenJK contributors
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This file is part of the OpenJK source code.
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OpenJK is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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===========================================================================
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*/
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// tr_mesh.c: triangle model functions
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#include "tr_local.h"
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float ProjectRadius( float r, vec3_t location )
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{
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float pr;
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float dist;
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float c;
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vec3_t p;
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float width;
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float depth;
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c = DotProduct( tr.viewParms.ori.axis[0], tr.viewParms.ori.origin );
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dist = DotProduct( tr.viewParms.ori.axis[0], location ) - c;
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if ( dist <= 0 )
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return 0;
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p[0] = 0;
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p[1] = Q_fabs( r );
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p[2] = -dist;
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width = p[0] * tr.viewParms.projectionMatrix[1] +
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p[1] * tr.viewParms.projectionMatrix[5] +
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p[2] * tr.viewParms.projectionMatrix[9] +
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tr.viewParms.projectionMatrix[13];
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depth = p[0] * tr.viewParms.projectionMatrix[3] +
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p[1] * tr.viewParms.projectionMatrix[7] +
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p[2] * tr.viewParms.projectionMatrix[11] +
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tr.viewParms.projectionMatrix[15];
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pr = width / depth;
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if ( pr > 1.0f )
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pr = 1.0f;
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return pr;
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}
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