Assimp: Collada Animations: Use quaternion problem

[kuny-yt]

1.Keyframes in the DAE model:
quat1-0.033333 :0.043640,0.666785,0.048615,-0.742380
quat2-0.066666 :0.042636,0.664431,0.047763,-0.744605
2.After import via Assimp:
0.033333 : -0.0436404, -0.666785, -0.0486147, 0.742381
0.044444 : 0.621911, -0.374857, 0.552608, 0.409065
0.055555 : 0.66569, 0.290997, 0.600118, -0.334718
0.066666 : -0.0426365, -0.66443, -0.0477633, 0.744603

After I extracted the quaternion in the animation channel, I get the above error.
Adopt version 4.1.0

[kuny-yt]

// 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[channelElement.mTransformIndex].mType == Collada::TF_ROTATE && channelElement.mSubElement == 3 && pos > 0 && pos < channelElement.mTimeAccessor->mCount)
{
const ai_real cur_key_angle = ReadFloat(channelElement.mValueAccessor, channelElement.mValueData, pos, 0);
const ai_real last_key_angle = ReadFloat(channelElement.mValueAccessor, channelElement.mValueData, pos - 1, 0);
const ai_real cur_key_time = ReadFloat(channelElement.mTimeAccessor, channelElement.mTimeData, pos, 0);
const ai_real last_key_time = ReadFloat(channelElement.mTimeAccessor, channelElement.mTimeData, pos - 1, 0);
const ai_real last_eval_angle = last_key_angle + (cur_key_angle - last_key_angle) * (time - last_key_time) / (cur_key_time - last_key_time);
const ai_real delta = std::abs(cur_key_angle - last_eval_angle);
if (delta >= 180.0) {
const int subSampleCount = static_cast(std::floor(delta / 90.0));
if (cur_key_time != time) {
const ai_real nextSampleTime = time + (cur_key_time - time) / subSampleCount;
nextTime = std::min(nextTime, nextSampleTime);
}
}
}/

By temporarily annotating the above code, the problem is basically solved. There should be an error in the interpolation in the keyframe of the model.

[kimkulling]

Thanks for the report. And many thanks for the hint as well. I will try to find some time to take a look onto your solution.