Melting Polygons

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On 18/01/2012 at 04:28, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   13 
Platform:   Windows  ;   
Language(s) :   C.O.F.F.E.E  ;   XPRESSO  ;

---------
Hi, I'm trying since a couple of hours unsuccessfully to melt the polygons of a polygon object using COFFEE within a XPRESSO tag.
 
I have got all the polygons selected and the object is the document's active object.
 
I'm trying the following commands to melt the polygons of the polygon object:
 
SendModelingCommand(MCOMMAND_MELT,doc,poly_obj,bc,MODELINGCOMMANDMODE_ALL);
SendModelingCommand(MCOMMAND_MELT,doc,poly_obj,bc,MODELINGCOMMANDMODE_POLYGONSELECTION);
SendModelingCommand(ID_MODELING_MELT_COMMAND,doc,poly_obj,bc,MODELINGCOMMANDMODE_ALL);
SendModelingCommand(ID_MODELING_MELT_COMMAND,doc,poly_obj,bc,MODELINGCOMMANDMODE_POLYGONSELECTION);
 
CallCommand(1010136)     This is the GUI Melt Command
CallCommand(440000043) This is the GUI dissolve Command
 
None of those is processing the polygons, though the object is active and the polygons are selected. (I have checked on the OM and Viewport that this is the case).
 
The BaseContainer bc is a dummy BaseContainer, as for the melt command no parameters are required.
 
Am I missing something? Is there a concrete command sequence to melt/dissolve polygons?
 
Thanks,
ma.bad

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On 19/01/2012 at 01:18, xxxxxxxx wrote:

Hi,

First, ID_MODELING_MELT_COMMAND is meant to be used with CallCommand() and MCOMMAND_MELT with SendModelingCommand().

If I have several polygons selected and I call the following COFFEE command in the console:

CallCommand(ID_MODELING_MELT_COMMAND)

It works as expected.

Also if I call Melt command with SendModelingCommand() :

main(doc,op)
{
  var bc = new(BaseContainer);
  SendModelingCommand(MCOMMAND_MELT, doc, op, bc, MODELINGCOMMANDMODE_POLYGONSELECTION);
}

This works as well.

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On 20/01/2012 at 02:00, xxxxxxxx wrote:

Thanks for your answer. I have to admit, I do not understand the behavior of COFFEE in this case.
My code is as follows:

  if (Melt)  
{  
 doc->SetActiveObject(poly_obj);  
 SendModelingCommand(MCOMMAND_SELECTALL,doc,poly_obj,bc,MODELINGCOMMANDMODE_POLYGONSELECTION);  
 var select = poly_obj->GetPolygonSelection();  
 println("Selected= ",select->GetCount());  
 //SendModelingCommand(  
 println("Melting");  
 SendModelingCommand(MCOMMAND_MELT,doc,poly_obj,bc,MODELINGCOMMANDMODE_POLYGONSELECTION);  
 CallCommand(ID_MODELING_MELT_COMMAND);  
 poly_obj->Message(MSG_UPDATE);  
}    

As you can see, in my script I check that the comparison is passed with println ("Melting"); and I also check that I have polygons selected.
 
Nor the SendModelingCommand nor the CallCommand take any actions on the polygon object. If I execute the CallCommand from the console after the script has ended, it does what is expected, but not from inside the code. I think that's kind of weird, isn't it?

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On 20/01/2012 at 06:22, xxxxxxxx wrote:

Originally posted by xxxxxxxx

As you can see, in my script I check that the comparison is passed with println ("Melting"); and I also check that I have polygons selected.
 
Nor the SendModelingCommand nor the CallCommand take any actions on the polygon object. If I execute the CallCommand from the console after the script has ended, it does what is expected, but not from inside the code. I think that's kind of weird, isn't it?

If I execute your code, it works as expected. 
 
Is "Melting" printed in the console ? i.e. do you enter in the 'if' ?
Does your object is really an editable polygon object ?

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On 20/01/2012 at 06:54, xxxxxxxx wrote:

Yes, I see the message "Melting" on the console and the number of selected polygons (the other print statement).
 
When I execute the Melt command from the GUI the polygons get melted, so I believe the structure of the polygons are sound.
 
When the script runs AND I am using Poligon Mode I even see the polygons selected on the HUD and on the display view.
 
The only instance where I have found the GUI's melt command not to work is when on Object or Model modes. Might be COFFEE assuming I am in Model / Object mode and it does not want to melt the polygons? (Tough I have Polygon Mode selected for the GUI)

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On 20/01/2012 at 14:42, xxxxxxxx wrote:

Originally posted by xxxxxxxx

Yes, I see the message "Melting" on the console and the number of selected polygons (the other print statement).
 
When I execute the Melt command from the GUI the polygons get melted, so I believe the structure of the polygons are sound.
 
When the script runs AND I am using Poligon Mode I even see the polygons selected on the HUD and on the display view.
 
The only instance where I have found the GUI's melt command not to work is when on Object or Model modes. Might be COFFEE assuming I am in Model / Object mode and it does not want to melt the polygons? (Tough I have Polygon Mode selected for the GUI)

You can make sure modeling commands will be evaluated in polygon mode by forcing polygon mode with:

CallCommand(12187); // Set Polygon mode

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On 24/01/2012 at 21:04, xxxxxxxx wrote:

I'm not beeing lucky. To reduce the possible points of error I have created a COFFEE tag with the code I'm using on the xpresso COFFEE node. It is like this:

main(doc,op)  
{  
 var bc = new (BaseContainer);   
 doc->SetActiveObject(op);    
 SendModelingCommand(MCOMMAND_SELECTALL,doc,op,bc,MODELINGCOMMANDMODE_POLYGONSELECTION);  
 var select = op->GetPolygonSelection();  
 println("Selected= ",select->GetCount());  
 //SendModelingCommand(  
 println("COFFEE TAG");  
 SendModelingCommand(MCOMMAND_MELT,doc,op,bc,MODELINGCOMMANDMODE_POLYGONSELECTION);  
 op->Message(MSG_UPDATE);  
}

I create a plane and make it editable. When I apply the COFFEE tag to the plane, its polygons do not get melted, though I can see the message "COFFEE TAG" on the console.
Curiously when I am on the COFFEE code Editor and press the button execute, the polygons get melt.
Have you got any idea about what is causing this behaviour?
If you have any functional sample working code which works from a COFFEE tag, Xpresso COFFEE node, I would appreciate if you could post it.
When executing the code from the console it seems to work properly but not when executed from a tag/node.
Thanks
 
[P.S.] I found that pressing the play animation button, after a while (10 or 12 frames) the polygons get melted when using the COFFEE Tag. Why is necessary for the script to run several times to melt the polygons? My XPresso node cannot work this way, as I am creating a polygon based on a series of user entered points, and I would need to run only once the melt command.

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On 25/01/2012 at 07:18, xxxxxxxx wrote:

Why do you really need to run the modeling commands from a tag or XPresso node ?
Scripting tags and nodes are called for each frame.

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On 25/01/2012 at 09:16, xxxxxxxx wrote:

I've written an XPresso tag, which from a closed spline creates a polygon object. The easiest way to "untriangulate" its polygons, is to melt them. The XPresso expresion resides on a Null Object (could be anywhere else) and by dragging a spline to a User Defined Parameter of the XPresso tag, and activating a boolean User Defined Parameter, it creates the triangulated polygon.
The XPresso expression only runs once, because when it is called again, by checking the boolean Parameter, I know whether the function has already been executed and I exit the function. I don't need the function to run more than once. That's how C4D works. But when it runs once, it does not seem to work. I found accidentally, as the COFFEE tag does not check whether I already executed the expression or not, that if it is executed several times, eventually it works.
The last step I need for the expression is to "untriangulate" the created polygon...
Is there another way of doing this? I believe my approach is a valid one.

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On 26/01/2012 at 01:53, xxxxxxxx wrote:

I'm still a bit confused, are you executing the code from a COFFEE tag or an XPresso COFFEE node ?

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On 26/01/2012 at 02:32, xxxxxxxx wrote:

My original script runs from a XPresso COFFEE node.
To check functionality of the part that was not working as I expected (the melting of polygons) I put it in a COFFEE Tag. The code is above, date 24.01.
In any case none of both work as I was expecting.
 
Does the code I added on 24.01 work for you? As I think this is the way the melting command should be called, from a COFFEE tag or from an Xpresso COFFEE node.
If this is not the way, any help about the sequence of statements to use would be really appreciated.

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On 26/01/2012 at 03:20, xxxxxxxx wrote:

Originally posted by xxxxxxxx

Does the code I added on 24.01 work for you? As I think this is the way the melting command should be called, from a COFFEE tag or from an Xpresso COFFEE node.
If this is not the way, any help about the sequence of statements to use would be really appreciated.

A COFFEE tag is called every time the editor is redrawn. An XPresso COFFEE node is called for every execution of the XPresso setup where the node is located.

Could you send an example scene to [email protected] ? I don't know how to exactly reproduce the problem (Spline user data + XPresso setup etc.).

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On 26/01/2012 at 09:10, xxxxxxxx wrote:

This may be a limitation/bug while sending modeling commands from a COFFEE XPresso node.
I don't see any error in the code. As you already told me I also tried to run it from the script manager and it works.

I converted the code to Python and it works from the script manager and from a Python XPresso node.
In case you need the code:

import c4d
from c4d import utils
  
def main() :
  
    if Done: return
  
    # Create Polygon object to create all edges
    poly_obj = c4d.BaseObject(c4d.Opolygon)
    
    # We need a spline object to get its points
    if not Object.CheckType(c4d.Ospline) : return # Not a point object
  
    # Get number of points of the point object
    cnt_points = Object.GetPointCount()
  
    # Get all point positions
    pos_point = Object.GetAllPoints()
  
    # Add the number of points to the polygon
    poly_obj.ResizeObject(cnt_points)
  
    # Position the points at the same place as they are at the spline
    for i in range(0,cnt_points) :
        #print pos_point[i]
        poly_obj.SetPoint(i,pos_point[i])
  
    # Create polys
    for i in range(1,cnt_points) :
        cnt_polys=poly_obj.GetPolygonCount()
        poly_obj.ResizeObject(cnt_points,cnt_polys+1)
  
        # Create a polygon with the points
        poly_obj.SetPolygon(cnt_polys,c4d.CPolygon(0,i-1,i,i))
    
    poly_obj.Message(c4d.MSG_UPDATE)
    doc.InsertObject(poly_obj)
  
    if Melt:
        bc = c4d.BaseContainer()
        doc.SetActiveObject(poly_obj)
        utils.SendModelingCommand(c4d.MCOMMAND_SELECTALL,[poly_obj],c4d.MODELINGCOMMANDMODE_POLYGONSELECTION,bc=bc,doc=doc)
        select = poly_obj.GetPolygonS()
        utils.SendModelingCommand(c4d.MCOMMAND_MELT,[poly_obj],c4d.MODELINGCOMMANDMODE_POLYGONSELECTION,bc=bc,doc=doc)
        poly_obj.Message(c4d.MSG_UPDATE)
    
    global Output1
    Output1=True

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On 26/01/2012 at 14:14, xxxxxxxx wrote:

Thanks a lot for the information and for the Python script.
Python was going to be my next step. I suppose this is a good reason to move on to Python.
 
Again thanks for the code. It saves me a good time in research.