Draw() Question

Helper

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 RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 20/02/2011 at 17:55, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   12
Platform:   Windows ;
Language(s) :     C++ ;

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Hey everyone. This is going to be a somewhat obscure question but I hope that it makes sense to someone. I have a particle system that I have created that works through an emitter class and a particle class. The emitter creates instances of the particle class and updates each particles position and all other attributes. Alone these items work fine. But when I make an instance of the emitter class in the Draw() of my object plugin, I get some pretty funky results. The emitter object emits particles like it should, however, it also emits particles in 2D that appear as though they are on the screen of the viewport. I am using DrawLine(), and DrawHandle() to draw the particles which uses Vectors for the position of those items. So I cannot figure out why I would be getting particles being emitted as if they are on the screen. It's funny because when I deselct the emitter object in the attributes manager, those "screen" particles disappear. So it has to be something with the Draw().

Here's my draw function.. Simply calls the Emitter class..

  
  
DRAWRESULT PXGEmitterObject::Draw(BaseObject* op, DRAWPASS drawpass, BaseDraw* bd, BaseDrawHelp* bh){  
    
  GePrint("EMITTER OBJ");  
  BaseContainer * bc = op->GetDataInstance();  
  
  BaseDocument *doc = op->GetDocument();  
  if (!doc) return DRAWRESULT_ERROR;  
  
  Real fps = doc->GetFps();                        //Get the current Frames Per Second  
  BaseTime bt = doc->GetTime();  
  LONG lngCurrentFrame =    bt.GetFrame(fps);        //Set a variable that represents the current selected frame  
  LONG time = GeGetTimer();  
  
  //Begin Emission Loop      
  if (bc->GetBool(EMITTER_ENABLE_EMITTER) == TRUE){  
      if(lngCurrentFrame > 0){  
          emitter->Update(time, bd, bh, op);  
      }  
  }  
  
  return DRAWRESULT_OK;  
}

This one is baffling me.. any help you all could offer would be awesome. I'd really like to know what would cause the DrawHandle() and DrawLine() to show up in 2D space. ??

Thanks,

Hope this makes sense.

~Shawn

Helper

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 RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 21/02/2011 at 02:31, xxxxxxxx wrote:

You probably haven't set the transformation matrix to object space yet for the drawing functions. The BaseDraw::SetMatrix_Matrix() method must be called before any drawing. See the docs for which drawing functions it is necessary to call SetMatrix_Matrix().

  
DRAWRESULT PXGEmitterObject::Draw(BaseObject* op, DRAWPASS drawpass, BaseDraw* bd, BaseDrawHelp* bh)  
{  
  if (drawpass!=DRAWPASS_OBJECT) return DRAWRESULT_SKIP;  
    
  // transformation matrix needs to be set for DrawLine and DrawHandle; for instance object space  
  const Matrix &mg = bh->GetMg();  
  bd->SetMatrix_Matrix(op, mg);  
  
  // do the drawing  
    
  ...  
}

cheers,
Matthias

Helper

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

On 21/02/2011 at 03:58, xxxxxxxx wrote:

Thanks Matthias... Problem solved..

~Shawn