diff options
Diffstat (limited to 'intern/moto/include/MT_Quaternion.inl')
| -rw-r--r-- | intern/moto/include/MT_Quaternion.inl | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/intern/moto/include/MT_Quaternion.inl b/intern/moto/include/MT_Quaternion.inl index 225b95b78ce..8b4fbc93c41 100644 --- a/intern/moto/include/MT_Quaternion.inl +++ b/intern/moto/include/MT_Quaternion.inl @@ -60,3 +60,27 @@ GEN_INLINE MT_Quaternion operator*(const MT_Vector3& w, const MT_Quaternion& q) -w[0] * q[0] - w[1] * q[1] - w[2] * q[2]); } +GEN_INLINE MT_Scalar MT_Quaternion::angle(const MT_Quaternion& q) const +{ + MT_Scalar s = sqrt(length2() * q.length2()); + assert(s != MT_Scalar(0.0)); + return acos(dot(q) / s); +} + +GEN_INLINE MT_Quaternion MT_Quaternion::slerp(const MT_Quaternion& q, const MT_Scalar& t) const +{ + MT_Scalar theta = angle(q); + if (theta != MT_Scalar(0.0)) + { + MT_Scalar d = MT_Scalar(1.0) / sin(theta); + MT_Scalar s0 = sin((MT_Scalar(1.0) - t) * theta); + MT_Scalar s1 = sin(t * theta); + + return d*(*this * s0 + q * s1); + } + else + { + return *this; + } +} + |