World Translation Of an animation

BinaryCats

Hi,

I need to be able to get the translation if a bone in an animation. I can currently get the translation from the spTranslateTimeline but this which is stored in this time line is only local, therefore if a parent bone moves this bone it will not be accounted for.

This is similar to the current code:

spAnimationState * animState = GetAnimationState();
spSkeleton * skeleton = Get2DSkeleton();
Vector2 vMov = Vector2(0,0);

spAnimation* anim = spSkeletonData_findAnimation(animState->data->skeletonData,animName);


for (int i = 0; i < anim->timelinesCount; i++)
{
   if (anim->timelines[i]->type == SP_TIMELINE_TRANSLATE)
   {

  spTranslateTimeline* self = (spTranslateTimeline*)anim->timelines[i];
   
  if( self->boneIndex == boneid )//makes sure we are looking at the correct bone
  {

     float y  =    skeleton->bones[boneid]->worldY + (self->frames[self->framesCount - 1]);
     float x  =    skeleton->bones[boneid]->worldX + (self->frames[self->framesCount - 2]);
         vMov = Vector2(x,y);
  }
   }
}

I doubt there is another way to do it except from going back up the skeleton's hierarchy, but if anyone has any ideas please let me know 🙂

Also, I am unsure why, but the current code only finds the last transform(s) in the animation, that's fine for now, but is there any way for sorting through all the time lines?

Thanks in advance

Mitch

Bone. WorldX and WorldY

Err, missed the 'in animation' part heh.

Yea, you need to account for the whole skeleton hierarchy.

Strongly suggest you just instance a skeleton and apply the animation directly then get the worldx and y. Especially if any flip or scale is involved.

BinaryCats

We have this working now.

At first we recursively traversed the hierarchy of bones, and added the translations from the timelines (these should really be renamed to keys or keyframes, it makes debugging hard 🙁 ).

However this does not work, the reason being is that the parent bone of an translation animation YisDown is true, so if the parent bone moves -200 in the x, the translation in the timeline will be +200 and the bone will have a -180 rotation in the setup pose. You can do some extra maths to get the correct position but we opted for the method below. As a question (to nate I guess) What determines if Y is down on a bone?

This code plays an animation on the final frame and gets the world position of the bone. which works 🙂

spAnimationStateData* stateData = spAnimationStateData_create( SkeletonData );
spAnimationState* newAnimState = spAnimationState_create( stateData );

spAnimationState_setAnimationByName( newAnimState, 0, animName, false  );

skeleton->time = anim->duration;
spAnimationState_update( newAnimState, skeleton->time * 1 );
spAnimationState_apply( newAnimState, skeleton );
spSkeleton_updateWorldTransform( skeleton );

Vector2 pos = Vector2(GetBone(boneid).Translate.x,   GetBone(boneid).Translate.y);