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Math Lib: inline project_plane_v3_v3v3

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Campbell Barton
2016-05-03 13:30:16 +10:00
parent a58a8ebea7
commit 48d3a8b54b
1 changed files with 15 additions and 6 deletions
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21
source/blender/blenlib/intern/math_vector.c
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@@ -591,19 +591,28 @@ void project_v3_v3v3(float c[3], const float v1[3], const float v2[3])
* Projecting will make \a c a copy of \a v orthogonal to \a v_plane. * Projecting will make \a c a copy of \a v orthogonal to \a v_plane.
* *
* \note If \a v is exactly perpendicular to \a v_plane, \a c will just be a copy of \a v. * \note If \a v is exactly perpendicular to \a v_plane, \a c will just be a copy of \a v.
*
* \note This function is a convenience to call:
* \code{.c}
* project_v3_v3v3(c, v, v_plane);
* sub_v3_v3v3(c, v, c);
* \endcode
*/ */
void project_plane_v3_v3v3(float c[3], const float v[3], const float v_plane[3]) void project_plane_v3_v3v3(float c[3], const float v[3], const float v_plane[3])
{ {
float delta[3]; const float mul = dot_v3v3(v, v_plane) / dot_v3v3(v_plane, v_plane);
project_v3_v3v3(delta, v, v_plane);
sub_v3_v3v3(c, v, delta); c[0] = v[0] - (mul * v_plane[0]);
c[1] = v[1] - (mul * v_plane[1]);
c[2] = v[2] - (mul * v_plane[2]);
} }
void project_plane_v2_v2v2(float c[2], const float v[2], const float v_plane[2]) void project_plane_v2_v2v2(float c[2], const float v[2], const float v_plane[2])
{ {
float delta[2]; const float mul = dot_v2v2(v, v_plane) / dot_v2v2(v_plane, v_plane);
project_v2_v2v2(delta, v, v_plane);
sub_v2_v2v2(c, v, delta); c[0] = v[0] - (mul * v_plane[0]);
c[1] = v[1] - (mul * v_plane[1]);
} }
/* project a vector on a plane defined by normal and a plane point p */ /* project a vector on a plane defined by normal and a plane point p */