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Add check to flip quaternion (#1624)

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masterex1000 2021-03-01 16:29:48 -07:00 • committed by GitHub
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commit 4e6253b546
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src/raymath.h
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@ -1271,6 +1271,11 @@ RMDEF Quaternion QuaternionSlerp(Quaternion q1, Quaternion q2, float amount)
float cosHalfTheta = q1.x*q2.x + q1.y*q2.y + q1.z*q2.z + q1.w*q2.w;
if (cosHalfTheta < 0) {
q2.x = -q2.x; q2.y = -q2.y; q2.z = -q2.z; q2.w = -q2.w;
cosHalfTheta = -cosHalfTheta;
}
if (fabs(cosHalfTheta) >= 1.0f) result = q1;
else if (cosHalfTheta > 0.95f) result = QuaternionNlerp(q1, q2, amount);
else