}
++pos;
}
+
+ // https://github.com/assimp/assimp/issues/458
+ // Sub-sample axis-angle channels if the delta between two consecutive
+ // key-frame angles is >= 180 degrees.
+ if (transforms[e.mTransformIndex].mType == Collada::TF_ROTATE && e.mSubElement == 3 && pos > 0 && pos < e.mTimeAccessor->mCount) {
+ float cur_key_angle = ReadFloat(*e.mValueAccessor, *e.mValueData, pos, 0);
+ float last_key_angle = ReadFloat(*e.mValueAccessor, *e.mValueData, pos - 1, 0);
+ float cur_key_time = ReadFloat(*e.mTimeAccessor, *e.mTimeData, pos, 0);
+ float last_key_time = ReadFloat(*e.mTimeAccessor, *e.mTimeData, pos - 1, 0);
+ float last_eval_angle = last_key_angle + (cur_key_angle - last_key_angle) * (time - last_key_time) / (cur_key_time - last_key_time);
+ float delta = std::fabs(cur_key_angle - last_eval_angle);
+ if (delta >= 180.0f) {
+ int subSampleCount = static_cast<int>(std::floorf(delta / 90.0f));
+ if (cur_key_time != time) {
+ float nextSampleTime = time + (cur_key_time - time) / subSampleCount;
+ nextTime = std::min(nextTime, nextSampleTime);
+ }
+ }
+ }
}
// no more keys on any channel after the current time -> we're done