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Enabling animation transition in ShapeBase object

Name:	Nerrad Weil
Date Posted:	Apr 21, 2008
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In my previous post I has discussed the technique to enable transition in ShapeBase animation, and it seems to be helpful to someone, in this post I would like to give more information about the technique i'd used

1) add a field in struct Thread in ShapeBase.h

struct Thread {
	...
	bool transit;	// transit addon
};

2) initialize Thread::transit in ShapeBase constructor

ShapeBase::ShapeBase {
	...
	for (i = 0; i < MaxScriptThreads; i++) {
		...
		mScriptThread[i].transit = false;	// transit addon
	}
}

3) in the exisitng ShapeBase::setThreadSequence() add this line

bool ShapeBase::setThreadSequence(U32 slot, S32 seq, bool reset)
{
	...
   if (seq < MaxSequenceIndex) {
      setMaskBits(ThreadMaskN << slot);
      st.sequence = seq;
      st.transit = false; // transit addon
	...
}

4) create a new method in ShapeBase, which is similar to setThreadSequence but with animation transition modification

in ShapeBase.cc

bool ShapeBase::setThreadTransitSequence(U32 slot,S32 seq, F32 duration, bool continuePlay, bool reset)
{
   Thread& st = mScriptThread[slot];
   if (st.thread && st.sequence == seq && st.state == Thread::Play)
      return true;

   if (seq < MaxSequenceIndex) {
      setMaskBits(ThreadMaskN << slot);
      st.sequence = seq;
	  st.transit = true;
      if (reset) {
         st.state = Thread::Play;
         st.atEnd = false;
         st.forward = true;
      }
      if (mShapeInstance) {
         if (!st.thread)
            st.thread = mShapeInstance->addThread();
         stopThreadSound(st);
         updateThread(st);
         mShapeInstance->transitionToSequence(st.thread,seq,0, duration, continuePlay);
      }
      return true;
   }
   return false;
}

in ShapeBase.h

   bool setThreadTransitSequence(U32 slot, S32 seq, F32 duration, bool continuePlay = true, bool reset = true);

5) in ShapeBase::packUpdate() method

ShapeBase::packUpdate()
{
	...
	if (stream->writeFlag(mask & ThreadMask)) {
		...
		stream->writeFlag(st.atEnd);
		stream->writeFlag(st.transit); // transit addon
		...
	}
}

6) in ShapeBase::unpackUpdate()

void ShapeBase::unpackUpdate(NetConnection *con, BitStream *stream)
{
	...
   if (stream->readFlag()) {
      for (S32 i = 0; i < MaxScriptThreads; i++) {
         if (stream->readFlag()) {
            Thread& st = mScriptThread[i];
            U32 seq = stream->readInt(ThreadSequenceBits);
            st.state = stream->readInt(2);
            st.forward = stream->readFlag();
            st.atEnd = stream->readFlag();
            st.transit = stream->readFlag();

            if (st.sequence != seq)
            {
               if (st.transit)
                  setThreadTransitSequence(i,seq,0.5,false,false);
               else
                  setThreadSequence(i,seq,false);
            }
            else
               updateThread(st);
			
         }
      }
   }
}

hope this is more informative than my previous post ;)

Recent Blog Posts

List:	04/21/08 - Enabling animation transition in ShapeBase object 01/06/08 - Journal of a young adventurer 06/Jan/08

Submit your own resources!

Michael Cozzolino (Apr 21, 2008 at 21:29 GMT)

Please put in private forums or resource section

Clara Easson (Apr 24, 2008 at 02:00 GMT)

Fantastic resource. Works perfectly.

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