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Rework DDE blendshape derivation and remove scaling and smoothing

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This commit is contained in:
David Rowe 2015-02-24 14:33:55 -08:00
parent af99a5d07b
commit e91a28a0a4
2 changed files with 50 additions and 75 deletions
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121
interface/src/devices/DdeFaceTracker.cpp
View file

@ -151,37 +151,6 @@ float DdeFaceTracker::getBlendshapeCoefficient(int index) const {
return (index >= 0 && index < (int)_blendshapeCoefficients.size()) ? _blendshapeCoefficients[index] : 0.0f;
}
static const float DDE_MIN_RANGE = -0.2f;
static const float DDE_MAX_RANGE = 1.5f;
float rescaleCoef(float ddeCoef) {
return (ddeCoef - DDE_MIN_RANGE) / (DDE_MAX_RANGE - DDE_MIN_RANGE);
}
const int MIN = 0;
const int AVG = 1;
const int MAX = 2;
const float LONG_TERM_AVERAGE = 0.999f;
void resetCoefficient(float * coefficient, float currentValue) {
coefficient[MIN] = coefficient[MAX] = coefficient[AVG] = currentValue;
}
float updateAndGetCoefficient(float * coefficient, float currentValue, bool scaleToRange = false) {
coefficient[MIN] = (currentValue < coefficient[MIN]) ? currentValue : coefficient[MIN];
coefficient[MAX] = (currentValue > coefficient[MAX]) ? currentValue : coefficient[MAX];
coefficient[AVG] = LONG_TERM_AVERAGE * coefficient[AVG] + (1.0f - LONG_TERM_AVERAGE) * currentValue;
if (coefficient[MAX] > coefficient[MIN]) {
if (scaleToRange) {
return glm::clamp((currentValue - coefficient[AVG]) / (coefficient[MAX] - coefficient[MIN]), 0.0f, 1.0f);
} else {
return glm::clamp(currentValue - coefficient[AVG], 0.0f, 1.0f);
}
} else {
return 0.0f;
}
}
void DdeFaceTracker::decodePacket(const QByteArray& buffer) {
if(buffer.size() > MIN_PACKET_SIZE) {
Packet packet;
@ -196,9 +165,6 @@ void DdeFaceTracker::decodePacket(const QByteArray& buffer) {
if (_reset || (_lastReceiveTimestamp == 0)) {
memcpy(&_referenceTranslation, &translation, sizeof(glm::vec3));
memcpy(&_referenceRotation, &rotation, sizeof(glm::quat));
resetCoefficient(_rightEye, packet.expressions[0]);
resetCoefficient(_leftEye, packet.expressions[1]);
_reset = false;
}
@ -207,51 +173,64 @@ void DdeFaceTracker::decodePacket(const QByteArray& buffer) {
translation -= _referenceTranslation;
translation /= LEAN_DAMPING_FACTOR;
translation.x *= -1;
_headTranslation = translation;
// Compute relative rotation
rotation = glm::inverse(_referenceRotation) * rotation;
// copy values
_headTranslation = translation;
_headRotation = rotation;
if (_lastReceiveTimestamp == 0) {
// On first packet, reset coefficients
}
// Set blendshapes
float EYE_MAGNIFIER = 4.0f;
float rightEye = glm::clamp((updateAndGetCoefficient(_rightEye, packet.expressions[0])) * EYE_MAGNIFIER, 0.0f, 1.0f);
_blendshapeCoefficients[_rightBlinkIndex] = rightEye;
float leftEye = glm::clamp((updateAndGetCoefficient(_leftEye, packet.expressions[1])) * EYE_MAGNIFIER, 0.0f, 1.0f);
_blendshapeCoefficients[_leftBlinkIndex] = leftEye;
float leftBrow = 1.0f - rescaleCoef(packet.expressions[14]);
if (leftBrow < 0.5f) {
_blendshapeCoefficients[_browDownLeftIndex] = 1.0f - 2.0f * leftBrow;
_blendshapeCoefficients[_browUpLeftIndex] = 0.0f;
// The DDE coefficients, overall, range from -0.2 to 1.5 or so. However, individual coefficients typically vary much
// less than this.
// Eye blendshapes
static const float RELAXED_EYE_VALUE = 0.1f;
float leftEye = packet.expressions[1] - RELAXED_EYE_VALUE;
float rightEye = packet.expressions[0] - RELAXED_EYE_VALUE;
if (leftEye > 0.0f) {
_blendshapeCoefficients[_leftBlinkIndex] = leftEye;
_blendshapeCoefficients[_leftEyeOpenIndex] = 0.0f;
} else {
_blendshapeCoefficients[_leftBlinkIndex] = 0.0f;
_blendshapeCoefficients[_leftEyeOpenIndex] = -leftEye;
}
if (rightEye > 0.0f) {
_blendshapeCoefficients[_rightBlinkIndex] = rightEye;
_blendshapeCoefficients[_rightEyeOpenIndex] = 0.0f;
} else {
_blendshapeCoefficients[_rightBlinkIndex] = 0.0f;
_blendshapeCoefficients[_rightEyeOpenIndex] = -rightEye;
}
// Eyebrow blendshapes
float browCenter = packet.expressions[17];
float browDelta = packet.expressions[24] - packet.expressions[23];
float browLeft = browCenter - browDelta;
float browRight = browCenter + browDelta;
if (browLeft > 0) {
_blendshapeCoefficients[_browUpLeftIndex] = browLeft;
_blendshapeCoefficients[_browDownLeftIndex] = 0.0f;
_blendshapeCoefficients[_browUpLeftIndex] = 2.0f * (leftBrow - 0.5f);
}
float rightBrow = 1.0f - rescaleCoef(packet.expressions[15]);
if (rightBrow < 0.5f) {
_blendshapeCoefficients[_browDownRightIndex] = 1.0f - 2.0f * rightBrow;
_blendshapeCoefficients[_browUpRightIndex] = 0.0f;
} else {
_blendshapeCoefficients[_browDownRightIndex] = 0.0f;
_blendshapeCoefficients[_browUpRightIndex] = 2.0f * (rightBrow - 0.5f);
_blendshapeCoefficients[_browUpLeftIndex] = 0.0f;
_blendshapeCoefficients[_browDownLeftIndex] = -browLeft;
}
float JAW_OPEN_MAGNIFIER = 1.4f;
_blendshapeCoefficients[_jawOpenIndex] = rescaleCoef(packet.expressions[21]) * JAW_OPEN_MAGNIFIER;
float SMILE_MULTIPLIER = 2.0f;
_blendshapeCoefficients[_mouthSmileLeftIndex] = glm::clamp(packet.expressions[24] * SMILE_MULTIPLIER, 0.0f, 1.0f);
_blendshapeCoefficients[_mouthSmileRightIndex] = glm::clamp(packet.expressions[23] * SMILE_MULTIPLIER, 0.0f, 1.0f);
if (browRight > 0) {
_blendshapeCoefficients[_browUpRightIndex] = browRight;
_blendshapeCoefficients[_browDownRightIndex] = 0.0f;
} else {
_blendshapeCoefficients[_browUpRightIndex] = 0.0f;
_blendshapeCoefficients[_browDownRightIndex] = -browRight;
}
if (browLeft + browRight > 0) {
_blendshapeCoefficients[_browUpCenterIndex] = (browLeft + browRight) / 2.0f;
} else {
_blendshapeCoefficients[_browUpCenterIndex] = 0.0f;
}
// Mouth blendshapes
_blendshapeCoefficients[_jawOpenIndex] = packet.expressions[21];
_blendshapeCoefficients[_mouthSmileLeftIndex] = packet.expressions[24];
_blendshapeCoefficients[_mouthSmileRightIndex] = packet.expressions[23];
} else {
qDebug() << "[Error] DDE Face Tracker Decode Error";
}

4
interface/src/devices/DdeFaceTracker.h
View file

@ -90,10 +90,6 @@ private:
int _mouthSmileRightIndex;
int _jawOpenIndex;
float _leftEye[3];
float _rightEye[3];
};
#endif // hifi_DdeFaceTracker_h