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Math Lib: redundant axis flip decomposing a plane 

Also add a faster, non-normalized version of the function.

(Neither are used currently used).
This commit is contained in:
Campbell Barton 2015-03-04 20:08:16 +11:00
parent b1e48ab4e4
commit 6efcd9e8fe
2 changed files with 15 additions and 5 deletions
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4
source/blender/blenlib/BLI_math_geom.h
View File

@ -74,7 +74,9 @@ float cross_poly_v2(const float verts[][2], unsigned int nr);
/********************************* Planes **********************************/
void plane_from_point_normal_v3(float r_plane[4], const float plane_co[3], const float plane_no[3]);
void plane_to_point_normal_v3(const float plane[4], float r_plane_co[3], float r_plane_no[3]);
void plane_to_point_vector_v3(const float plane[4], float r_plane_co[3], float r_plane_no[3]);
void plane_to_point_vector_v3_normalized(const float plane[4], float r_plane_co[3], float r_plane_no[3]);
MINLINE float plane_point_side_v3(const float plane[4], const float co[3]);
/********************************* Volume **********************************/

16
source/blender/blenlib/intern/math_geom.c
View File

@ -257,14 +257,22 @@ void plane_from_point_normal_v3(float r_plane[4], const float plane_co[3], const
}
/**
* Get a point and a normal from a plane.
* Get a point and a direction from a plane.
*/
void plane_to_point_normal_v3(const float plane[4], float r_plane_co[3], float r_plane_no[3])
void plane_to_point_vector_v3(const float plane[4], float r_plane_co[3], float r_plane_no[3])
{
const float length = normalize_v3_v3(r_plane_no, plane);
madd_v3_v3v3fl(r_plane_co, r_plane_no, r_plane_no, (-plane[3] / length) - 1.0f);
mul_v3_v3fl(r_plane_co, plane, (-plane[3] / len_squared_v3(plane)));
copy_v3_v3(r_plane_no, plane);
}
/**
* version of #plane_to_point_vector_v3 that gets a unit length vector.
*/
void plane_to_point_vector_v3_normalized(const float plane[4], float r_plane_co[3], float r_plane_no[3])
{
const float length = normalize_v3_v3(r_plane_no, plane);
mul_v3_v3fl(r_plane_co, r_plane_no, (-plane[3] / length));
}
/********************************* Volume **********************************/