50 lines
2.1 KiB
C
50 lines
2.1 KiB
C
/****************************************************************************
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** Copyright (c) 2016, Fougue Ltd. <http://www.fougue.pro>
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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**
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** 2. Redistributions in binary form must reproduce the above
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** copyright notice, this list of conditions and the following
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** disclaimer in the documentation and/or other materials provided
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** with the distribution.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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****************************************************************************/
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#include "stl_triangle.h"
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#include "../gmio_core/internal/vecgeom_utils.h"
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GMIO_INLINE struct gmio_vec3f gmio_vec3f_sub(
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const struct gmio_vec3f* u, const struct gmio_vec3f* v)
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{
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struct gmio_vec3f diff;
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diff.x = u->x - v->x;
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diff.y = u->y - v->y;
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diff.z = u->z - v->z;
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return diff;
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}
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void gmio_stl_triangle_compute_normal(struct gmio_stl_triangle* tri)
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{
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const struct gmio_vec3f u = gmio_vec3f_sub(&tri->v2, &tri->v1);
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const struct gmio_vec3f v = gmio_vec3f_sub(&tri->v3, &tri->v1);
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gmio_vec3f_cross_product(&u, &v, &tri->n);
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}
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