43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant 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 GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mathlib.h"
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void line_construct_for_vec3( line_t *line, const vec3_t start, const vec3_t end ){
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VectorMid( start, end, line->origin );
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VectorSubtract( end, line->origin, line->extents );
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}
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int line_test_plane( const line_t* line, const vec4_t plane ){
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float fDist;
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// calc distance of origin from plane
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fDist = DotProduct( plane, line->origin ) + plane[3];
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// accept if origin is less than or equal to this distance
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if ( fabs( fDist ) < fabs( DotProduct( plane, line->extents ) ) ) {
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return 1; // partially inside
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}
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else if ( fDist < 0 ) {
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return 2; // totally inside
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}
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return 0; // totally outside
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}
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