1 // vector.hxx -- additional vector routines
3 // Written by Curtis Olson, started December 1997.
5 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 # error This library requires C++
36 // Map a vector onto the plane specified by normal
37 #if defined( USE_XTRA_MAT3_INLINES )
38 # define map_vec_onto_cur_surface_plane(normal, v0, vec, result) { \
39 double scale = ((normal[0]*vec[0]+normal[1]*vec[1]+normal[2]*vec[2]) / \
40 (normal[0]*normal[0]+normal[1]*normal[1]+normal[2]*normal[2])); \
41 result[0] = vec[0]-normal[0]*scale; \
42 result[1] = vec[1]-normal[1]*scale; \
43 result[2] = vec[2]-normal[2]*scale; \
46 void map_vec_onto_cur_surface_plane(MAT3vec normal, MAT3vec v0, MAT3vec vec,
48 #endif //defined( USE_XTRA_MAT3_INLINES )
51 // Given a point p, and a line through p0 with direction vector d,
52 // find the shortest distance from the point to the line
53 double fgPointLine(MAT3vec p, MAT3vec p0, MAT3vec d);
56 // Given a point p, and a line through p0 with direction vector d,
57 // find the shortest distance (squared) from the point to the line
58 double fgPointLineSquared(MAT3vec p, MAT3vec p0, MAT3vec d);