diff options
Diffstat (limited to 'indra/llmath/v3math.h')
| -rwxr-xr-x | indra/llmath/v3math.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/indra/llmath/v3math.h b/indra/llmath/v3math.h index 0432aeba4c..c807a30f7b 100755 --- a/indra/llmath/v3math.h +++ b/indra/llmath/v3math.h @@ -159,6 +159,9 @@ F32 dist_vec(const LLVector3 &a, const LLVector3 &b); // Returns distance betwe F32 dist_vec_squared(const LLVector3 &a, const LLVector3 &b);// Returns distance squared between a and b F32 dist_vec_squared2D(const LLVector3 &a, const LLVector3 &b);// Returns distance squared between a and b ignoring Z component LLVector3 projected_vec(const LLVector3 &a, const LLVector3 &b); // Returns vector a projected on vector b +// Returns a vector in direction of a, such that when projected onto b, gives you the same value as b +// in other words: projected_vec(inverse_projected_vec(a, b), b) == b; +LLVector3 inverse_projected_vec(const LLVector3 &a, const LLVector3 &b); LLVector3 parallel_component(const LLVector3 &a, const LLVector3 &b); // Returns vector a projected on vector b (same as projected_vec) LLVector3 orthogonal_component(const LLVector3 &a, const LLVector3 &b); // Returns component of vector a not parallel to vector b (same as projected_vec) LLVector3 lerp(const LLVector3 &a, const LLVector3 &b, F32 u); // Returns a vector that is a linear interpolation between a and b @@ -495,6 +498,18 @@ inline LLVector3 projected_vec(const LLVector3 &a, const LLVector3 &b) return project_axis * (a * project_axis); } +inline LLVector3 inverse_projected_vec(const LLVector3& a, const LLVector3& b) +{ + LLVector3 normalized_a = a; + normalized_a.normalize(); + LLVector3 normalized_b = b; + F32 b_length = normalized_b.normalize(); + + F32 dot_product = normalized_a * normalized_b; + //NB: if a _|_ b, then returns an infinite vector + return normalized_a * (b_length / dot_product); +} + inline LLVector3 parallel_component(const LLVector3 &a, const LLVector3 &b) { return projected_vec(a, b); |