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utility vector functions for flipping one vector about another:

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nicer then interp_v3_v3v3(v, v1, v2, -1.0f);
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Campbell Barton
2013-01-18 23:07:27 +00:00
parent b7a2402da6
commit 32ce3a6ca7
2 changed files with 30 additions and 0 deletions
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4
source/blender/blenlib/BLI_math_vector.h
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@@ -171,6 +171,10 @@ void mid_v3_v3v3(float r[3], const float a[3], const float b[3]);
void mid_v2_v2v2(float r[2], const float a[2], const float b[2]);
void mid_v3_v3v3v3(float v[3], const float v1[3], const float v2[3], const float v3[3]);
void flip_v4_v4v4(float v[4], const float v1[4], const float v2[4]);
void flip_v3_v3v3(float v[3], const float v1[3], const float v2[3]);
void flip_v2_v2v2(float v[2], const float v1[2], const float v2[2]);
/********************************* Comparison ********************************/
MINLINE int is_zero_v3(const float a[3]);

26
source/blender/blenlib/intern/math_vector.c
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@@ -122,6 +122,32 @@ void mid_v3_v3v3v3(float v[3], const float v1[3], const float v2[3], const float
v[2] = (v1[2] + v2[2] + v3[2]) / 3.0f;
}
/**
* Equivalent to:
* interp_v3_v3v3(v, v1, v2, -1.0f);
*/
void flip_v4_v4v4(float v[4], const float v1[4], const float v2[4])
{
v[0] = v1[0] + (v1[0] - v2[0]);
v[1] = v1[1] + (v1[1] - v2[1]);
v[2] = v1[2] + (v1[2] - v2[2]);
v[3] = v1[3] + (v1[3] - v2[3]);
}
void flip_v3_v3v3(float v[3], const float v1[3], const float v2[3])
{
v[0] = v1[0] + (v1[0] - v2[0]);
v[1] = v1[1] + (v1[1] - v2[1]);
v[2] = v1[2] + (v1[2] - v2[2]);
}
void flip_v2_v2v2(float v[2], const float v1[2], const float v2[2])
{
v[0] = v1[0] + (v1[0] - v2[0]);
v[1] = v1[1] + (v1[1] - v2[1]);
}
/********************************** Angles ***********************************/
/* Return the angle in radians between vecs 1-2 and 2-3 in radians