tri_ray.h

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/*                      T R I _ R A Y . H
 * BRL-CAD
 *
 * Copyright (c) 2004-2026 United States Government as represented by
 * the U.S. Army Research Laboratory.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * version 2.1 as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this file; see the file named COPYING for more
 * information.
 */
 
/*----------------------------------------------------------------------*/
/* @file tri_ray.h */
/** @addtogroup bg_tri_ray */
/** @{ */
 
/** @brief Triangle ray and line intersection tests. */
 
#ifndef BG_TRI_RAY_H
#define BG_TRI_RAY_H
 
#include "common.h"
#include "vmath.h"
#include "bg/defines.h"
 
__BEGIN_DECLS
 
/**
 * @brief Test whether an infinite line intersects a triangle.
 *
 * The line is orig + t * dir for all real t.  The direction must be nonzero.
 * If isect is non-NULL, it is written only when an intersection is found.
 */
BG_EXPORT extern int bg_isect_tri_line(point_t *isect,
                                       const point_t orig,
                                       const vect_t dir,
                                       const point_t vert0,
                                       const point_t vert1,
                                       const point_t vert2);
 
/**
 * @brief Test whether a forward ray intersects a triangle.
 *
 * The ray is orig + t * dir for t >= 0.  The direction must be nonzero.
 * If isect is non-NULL, it is written only when an intersection is found.
 */
BG_EXPORT extern int bg_isect_tri_ray(const point_t orig,
                                      const point_t dir,
                                      const point_t vert0,
                                      const point_t vert1,
                                      const point_t vert2,
                                      point_t *isect);
 
 
__END_DECLS
 
#endif  /* BG_TRI_RAY_H */
/** @} */
/*
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 * mode: C
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 * c-file-style: "stroustrup"
 * End:
 * ex: shiftwidth=4 tabstop=8
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