Setting Keyframes for Object Position

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 03/03/2010 at 10:55, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   10
Platform:   Windows ;
Language(s) :     C++ ;

---------
Hi,

I have created a CommandData plugin that adds an object to an existing scene and makes it follow a certain pre-defined path. For this I am setting the keyframes for the position of the object, i.e.

  
CTrack *bodyTrack = CTrack::Alloc(bodyOp,DescLevel(ID_BASEOBJECT_POSITION,DTYPE_VECTOR,0));   
if (!bodyTrack)     { return FALSE; }   
bodyOp->InsertTrackSorted(bodyTrack);   
CKey *bodyKey = NULL;   
for (LONG simCount = 0; simCount<=simRuns; simCount++)   
{   
Vector posVector = ComputeCoords(body,time);   
bodyKey = bodyTrack->GetCurve()->AddKey(BaseTime(simCount,framerate),NULL);   
bodyKey->SetGeData(bodyTrack->GetCurve(),posVector);             
time++;   
}

It seems to work, and I see all the keyframes and the object moves. However, I was expecting to also see these keyframes in the Attribute Manager (i.e. in the object description) and also to see the path in the editor window (like it happens when I manually change the position and set the keyframe). Why is that not shown? What do I have to do to show it?

Thanks,
Juergen

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 03/03/2010 at 15:02, xxxxxxxx wrote:

Does it show after you moved the timeslider? If yes, it's just a refresh/redraw problem.
If not, I also don't know.
Cheers,
Jack

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 04/03/2010 at 08:18, xxxxxxxx wrote:

Make sure to inform the object and managers about the changes.

  
bodyOp->Message(MSG_UPDATE);  
  
EventAdd();

cheers,
Matthias

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 08/03/2010 at 12:15, xxxxxxxx wrote:

Hi Matthias,

I am doing that. I have the keyframes and the objects are moving in the scene.

I just don't see the object path in the editor window and the respective coordinate fields in the attribute manager are not highlighted. I don't care so much about the latter, but is there a way to make the path show up as a spline in the editor window?

Juergen

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 09/03/2010 at 23:28, xxxxxxxx wrote:

I find it worrysome that it moves correctly but doesn't highlight the coordinates in the attribute manager.

How about

  
  CCurve *seq=bodyTrack->GetCurve();  
  bodyKey=CKey::Alloc();  
  bodyKey->SetGeData(seq,posVector);  
  bodyKey->SetTime(seq,BaseTime(simCount,framerate));  
  key->SetInterpolation(seq,CINTER_STEP);  
  if (!(seq->InsertKey(key))) {  
      GeConsoleOut(String("I'm in trouble :-)"));  
  }

That way you'll already have the correct values at the time you make the key known to Cinema 4D and you don't have to worry about refreshing.
I'm using this code snippet in a project of mine and I see the object path just fine in the editor.

Best regards
Mike

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 15/03/2010 at 02:02, xxxxxxxx wrote:

The error lies in your track allocation and key creation. Position tracks are three independent Real tracks.

Have a look at following code, it should be pretty much self explainatory:

  
Bool MenuTest::Execute(BaseDocument *doc)  
{  
  BaseObject *op = doc->GetActiveObject();  
  
  if (!op) return FALSE;  
  
  StopAllThreads();  
  
  CTrack *trackX = NULL;  
  CTrack *trackY = NULL;  
  CTrack *trackZ = NULL;  
  
  trackX = CTrack::Alloc(op,DescID(DescLevel(ID_BASEOBJECT_POSITION,DTYPE_VECTOR,0),DescLevel(VECTOR_X,DTYPE_REAL,0)));  
  if (!trackX) goto Error;  
  
  trackY = CTrack::Alloc(op,DescID(DescLevel(ID_BASEOBJECT_POSITION,DTYPE_VECTOR,0),DescLevel(VECTOR_Y,DTYPE_REAL,0)));  
  if (!trackY) goto Error;  
  
  trackZ = CTrack::Alloc(op,DescID(DescLevel(ID_BASEOBJECT_POSITION,DTYPE_VECTOR,0),DescLevel(VECTOR_Z,DTYPE_REAL,0)));  
  if (!trackZ) goto Error;  
  
  op->InsertTrackSorted(trackX);  
  op->InsertTrackSorted(trackY);  
  op->InsertTrackSorted(trackZ);  
  
  CKey *key = NULL;  
    
  //add keys add 0s  
  key = trackX->GetCurve()->AddKey(BaseTime()); if (!key) return FALSE;  
  key->SetValue(trackX->GetCurve(), 100.0);  
  
  key = trackY->GetCurve()->AddKey(BaseTime()); if (!key) return FALSE;  
  key->SetValue(trackY->GetCurve(), 100.0);  
  
  key = trackZ->GetCurve()->AddKey(BaseTime()); if (!key) return FALSE;  
  key->SetValue(trackZ->GetCurve(), 100.0);  
  
  //add keys at 1s  
  key = trackX->GetCurve()->AddKey(BaseTime(1.0)); if (!key) return FALSE;  
  key->SetValue(trackX->GetCurve(), 0.0);  
  
  key = trackY->GetCurve()->AddKey(BaseTime(1.0)); if (!key) return FALSE;  
  key->SetValue(trackY->GetCurve(), 0.0);  
  
  key = trackZ->GetCurve()->AddKey(BaseTime(1.0)); if (!key) return FALSE;  
  key->SetValue(trackZ->GetCurve(), 0.0);  
  
  op->Message(MSG_UPDATE);  
  EventAdd();  
  
  return TRUE;  
  
Error:  
  blDelete(trackX);  
  blDelete(trackY);  
  blDelete(trackZ);  
  return FALSE;  
}

cheers,
Matthias