Updating userdata gradient hangs cinema

  • On 09/12/2016 at 05:16, xxxxxxxx wrote:

    User Information:
    Cinema 4D Version:   16 
    Platform:   Windows  ;   
    Language(s) :     C++  ;

    I want to update the userdata gradient.
    Getting the information is ok, but updating and wrting back the knots is not ok.
    Cinema 4d hangs!

    obj->GetParameter(dscID, d, DESCFLAGS_GET_0);   //Get the info of this specific UD item and store the values in "d"
    Gradient* gd = (Gradient* )d.GetCustomDataType(CUSTOMDATATYPE_GRADIENT);
    Int32 kcnt = UDfloorGradientKnots.GetCount();		//knots previous stored
    for (i=0; i<kcnt; i++) {	
      eFKnot = UDfloorGradientKnots[i];
      knot.col = eFKnot.col;
      knot.pos = eFKnot.pos;					
      gd->SetKnot(i, knot);	
    d.SetCustomDataType(CUSTOMDATATYPE_GRADIENT, *gd);
    obj->SetParameter(dscID, d, DESCFLAGS_SET_0);	      	         //here cinema hangs!

  • On 09/12/2016 at 14:45, xxxxxxxx wrote:

    Since we are heading into the weekend and the support guys will be gone for a couple of days.
    I'll post my solution for you.

    //This code changes the color of the knots in a UserData based gradient gizmo  
    Bool MyPlugin::Execute(BaseDocument *doc)  
      BaseObject *obj = doc->GetActiveObject();  
      if (!obj) return false;  
      //Get the object's master UD container that holds all the UserData entries  
      DynamicDescription *dd = obj->GetDynamicDescription();  
      if (!dd) return FALSE;  
      //Get the gradient gizmo from the UD manager  
      GeData d;  
      Int32 gizmoID = 1;  //The ID# assigned to the UD entry in the UD manager  
      DescID udEntry(DescLevel(ID_USERDATA, DTYPE_SUBCONTAINER, 0), DescLevel(gizmoID));  
      obj->GetParameter(udEntry, d, DESCFLAGS_GET_0);  
      //For safety reasons we should check that the gizmo is a gradient type gizmo  
      if (d.GetType() != CUSTOMDATATYPE_GRADIENT)  
          GePrint("Wrong Data type");  
          return false;  
      Gradient *gd = (Gradient* )d.GetCustomDataType(CUSTOMDATATYPE_GRADIENT);  
      //Get the number of knots  
      Int32 kcnt = gd->GetKnotCount();  
      //We need to delete(flush) all of the knots to change them (yes..this is stupid...But that's how it's changed)  
      //So we first need to grab and store the current knots data in a list  
      maxon::BaseArray<GradientKnot> knots;  
      for(int i=0; i<kcnt; i++)  
          GradientKnot knot = gd->GetKnot(i);  
          Vector col = knot.col;  
          Float32 pos = knot.pos;  
      //Delete the existing knots  
      //Use the stored knot values to re-create them with a different color value  
      for(int i=0; i < knots.GetCount(); i++)  
          if(i==0) knots[i].col = Vector(1,0,0);  //Set the first knot color to red  
          else knots[i].col = Vector(0, 1, 0);    //Set the rest of the knot's colors the green  
          gd->SetKnot(i, knots[i]);  
      //Update the object to reflect the changes  
      obj->SetParameter(udEntry, d, DESCFLAGS_SET_0);    
      return true;  


  • On 10/12/2016 at 07:22, xxxxxxxx wrote:

    Hi ScottA,

    Thanks again for your support.
    I did remove "gd->SetKnot(i, knot);", I do not think it is needed and indeed it also works without it.


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