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simplify logic of RotationAccumulator::add()

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This commit is contained in:
Andrew Meadows 2015-09-18 10:13:21 -07:00
parent 6ed0a57d9f
commit a85afb5280
2 changed files with 8 additions and 8 deletions
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12
libraries/animation/src/RotationAccumulator.cpp
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@ -12,14 +12,12 @@
#include <glm/gtx/quaternion.hpp>
void RotationAccumulator::add(glm::quat rotation) {
if (_numRotations == 0) {
_rotationSum = rotation;
} else {
if (glm::dot(_rotationSum, rotation) < 0.0f) {
rotation = -rotation;
}
_rotationSum += rotation;
// make sure both quaternions are on the same hyper-hemisphere before we add them
if (glm::dot(_rotationSum, rotation) < 0.0f) {
rotation = -rotation;
}
// sum the rotation linearly (lerp)
_rotationSum += rotation;
++_numRotations;
}

4
libraries/animation/src/RotationAccumulator.h
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@ -14,6 +14,8 @@
class RotationAccumulator {
public:
RotationAccumulator() : _rotationSum(0.0f, 0.0f, 0.0f, 0.0f), _numRotations(0) { }
int size() const { return _numRotations; }
void add(glm::quat rotation);
@ -24,7 +26,7 @@ public:
private:
glm::quat _rotationSum;
int _numRotations = 0;
int _numRotations;
};
#endif // hifi_RotationAccumulator_h