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Guard against NaNs in eye tracker look-at position

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David Rowe 2015-08-06 20:46:51 -07:00
parent 427b8b973c
commit 738c5658fa
1 changed files with 10 additions and 3 deletions
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13
interface/src/devices/EyeTracker.cpp
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@ -76,20 +76,27 @@ void EyeTracker::processData(smi_CallbackDataStruct* data) {
float rightLinePlaneDotProduct = glm::dot(rightLineDirection, planeNormal);
// Gaze into distance if eyes are parallel or diverged; otherwise the look-at is the average of look-at points
glm::vec3 lookAtPosition;
if (abs(leftLinePlaneDotProduct) <= FLT_EPSILON || abs(rightLinePlaneDotProduct) <= FLT_EPSILON) {
_lookAtPosition = monocularDirection * (float)TREE_SCALE;
lookAtPosition = monocularDirection * (float)TREE_SCALE;
} else {
float leftDistance = glm::dot(planePoint - leftLinePoint, planeNormal) / leftLinePlaneDotProduct;
float rightDistance = glm::dot(planePoint - rightLinePoint, planeNormal) / rightLinePlaneDotProduct;
if (leftDistance <= 0.0f || rightDistance <= 0.0f
|| leftDistance > (float)TREE_SCALE || rightDistance > (float)TREE_SCALE) {
_lookAtPosition = monocularDirection * (float)TREE_SCALE;
lookAtPosition = monocularDirection * (float)TREE_SCALE;
} else {
glm::vec3 leftIntersectionPoint = leftLinePoint + leftDistance * leftLineDirection;
glm::vec3 rightIntersectionPoint = rightLinePoint + rightDistance * rightLineDirection;
_lookAtPosition = (leftIntersectionPoint + rightIntersectionPoint) / 2.0f;
lookAtPosition = (leftIntersectionPoint + rightIntersectionPoint) / 2.0f;
}
}
if (glm::isnan(lookAtPosition.x) || glm::isnan(lookAtPosition.y) || glm::isnan(lookAtPosition.z)) {
return;
}
_lookAtPosition = lookAtPosition;
}
}
#endif