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better predictive smoothing

This commit is contained in:
David Rose 2001-10-23 23:51:57 +00:00
parent e328baf2b4
commit 0ff966d799
1 changed files with 9 additions and 4 deletions
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13
direct/src/deadrec/smoothMover.cxx
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@ -260,19 +260,24 @@ compute_smooth_position(double timestamp) {
// With prediction in effect, we're allowed to anticipate where
// the avatar is going by a tiny bit, if we don't have current
// enough data. This works only if we have at least two points of
// old data, and they're not *too* old.
if (point_before > 0 &&
timestamp - timestamp_before <= _max_position_age) {
// old data.
if (point_before > 0) {
// To implement simple prediction, we simply back up in time to
// the previous two timestamps, and base our linear
// interpolation off of those two, extending into the future.
int point_before_before = point_before - 1;
const SamplePoint &point = _points[point_before_before];
SamplePoint &point = _points[point_before_before];
if (point._timestamp < timestamp_before) {
point_after = point_before;
timestamp_after = timestamp_before;
point_before = point_before_before;
timestamp_before = point._timestamp;
if (timestamp > timestamp_after + _max_position_age) {
// Don't allow the prediction to get too far into the
// future.
timestamp = timestamp_after + _max_position_age;
}
}
}
}