ofVec3f AssimpUtils::getAnimatedObjectPosition(ofxAssimpModelLoader &model){
ofxAssimpAnimation &animation = model.getAnimation(0);
const aiNodeAnim * channel = animation.getAnimation()->mChannels[0];
float progressInSeconds = animation.getPositionInSeconds();
aiVector3D presentPosition(0, 0, 0);
if(channel->mNumPositionKeys > 0) {
unsigned int frame = 0;
while(frame < channel->mNumPositionKeys - 1) {
if(progressInSeconds < channel->mPositionKeys[frame+1].mTime) {
break;
}
frame++;
}
unsigned int nextFrame = (frame + 1) % channel->mNumPositionKeys;
const aiVectorKey & key = channel->mPositionKeys[frame];
const aiVectorKey & nextKey = channel->mPositionKeys[nextFrame];
double diffTime = nextKey.mTime - key.mTime;
if(diffTime < 0.0) {
diffTime += animation.getDurationInSeconds();
}
if(diffTime > 0) {
float factor = float((progressInSeconds - key.mTime) / diffTime);
presentPosition = key.mValue + (nextKey.mValue - key.mValue) * factor;
} else {
presentPosition = key.mValue;
}
}
return ofVec3f(presentPosition.x, presentPosition.y, presentPosition.z);
}
