Triangulate?

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On 10/03/2007 at 03:42, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   9.1 
Platform:   Windows  ;   
Language(s) :     C++  ;

---------
Im writing a plugin to export C4D scenes to indigo XML format. When i export to .obj format(3ds gets triangulated automatically) i need to triangulate the mesh before export. how do i do that?

heres a code snippet:

Bool ExportXML::ExportObject(BaseObject *bo, BaseDocument *doc, Bool objExport, Filename fn, Bool meshLight)
{
BaseDocument *doc_dummy = BaseDocument::Alloc();
BaseTag *baset;
GeData gedata;
Material *tagmat;
Material *clonetagmat;
//Vector tempVector;
//Vector vector;

if (meshLight == 0)
{
//COPY MATERIAL
}

//COPY OBJECT

//SET POS 0,0,0 and ROTATION
Matrix matrix = baseobj->GetMg();

matrix.off.x = 0;
matrix.off.y = 0;
matrix.off.z = 0;

//rotete if .obj 0 1 0
if(objExport == 1)
{
//x
matrix.v1.x = 1;
matrix.v1.y = 0;
matrix.v1.z = 0;
//y
matrix.v2.x = 0;
matrix.v2.y = 0;
matrix.v2.z = -1;
//z
matrix.v3.x = 0;
matrix.v3.y = 1;
matrix.v3.z = 0;
}

baseobj->SetMg(matrix,FALSE);

if (meshLight == 0)
{
//SET MAT
}

if(objExport == 1)
{
// triangulate here
}

//EXPORT
if (objExport == 1) SaveDocument(doc_dummy,fn,TRUE,FORMAT_OBJEXPORT);
else SaveDocument(doc_dummy,fn,TRUE,FORMAT_3DSEXPORT);

doc_dummy->Free(doc_dummy);

return TRUE;
}

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On 10/03/2007 at 09:05, xxxxxxxx wrote:

Have you tried Triangulate()? 🙂

If your object isn't polygonal, you'll need to convert it to be so first using either BaseDocument::Polygonize() or SendModelingCommand(MCOMMAND_CURRENTSTATETOOBJECT,...).

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On 10/03/2007 at 10:05, xxxxxxxx wrote:

yes, i saw thet function in the documentation, but i have no clue wherei should get the values from

Bool Triangulate(Vector* padr, LONG pcnt, CPolygon** vadr, LONG* vcnt)

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On 10/03/2007 at 12:13, xxxxxxxx wrote:

Straight from the polygon object:

BaseObject* obj; // Your starting object  
PolygonObject* pobj = ToPoly(obj);  
Vector* padr = pobj->GetPoint();  
LONG pcnt = pobj->GetPointCount()  
if (!pcnt) return FALSE; // - or some error handling. This object has no points (and no useful polygons)  
// These point to the newly created polygon triangle array and the number of triangles - don't forget to GeFree(tripolys) when you are done with the array!  
CPolygon* tripolys;  
LONG tricount;  
if (!Triangulate(padr, pcnt, &tripolys;, &tricount;)) return FALSE; // Failed to triangulate  
if (!(tripolys && tricount)) return FALSE; // tripolys=NULL or tricount=0L

Then use these polygons instead of the ones on the original object - use the original points as they don't get changed during triangulation.

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On 27/03/2007 at 14:17, xxxxxxxx wrote:

thank you so far, but i still dont get what to do with the array.

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On 27/03/2007 at 14:44, xxxxxxxx wrote:

Ah, you are using the built-in Cinema 4D OBJ export. There are two ways to do this then:

1. Triangulate using SendModelingCommand(MCOMMAND_TRIANGULATE) and get the result to use for export - you'll probably want to InsertObject() this result into the dummy document. Follow the MCOMMAND_CURRENTSTATETOOBJECT example in this case.

2. Use the tripoly array to update the Polygon object. This will require calling PolygonObject::ResizeObject() with the current vertex array size and new polygon array size, filling in its polygon array with the tripoly array info, and then using the original Polygon object for export.

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On 31/03/2007 at 00:54, xxxxxxxx wrote:

thank you very much, works great.

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On 22/04/2008 at 10:50, xxxxxxxx wrote:

ok, first of all, sry for ressurrecting such an old topic.

I'm still have problems with triangulation.

Until now i was using SendModelingCommand(MCOMMAND_TRIANGULATE, Mdd), and it works fine.

But when i use Triangulate() the way kuroyume described, they alway come out mixed up, i cant get i to work:

help?

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On 23/04/2008 at 14:58, xxxxxxxx wrote:

did i understand something wrong?

no idea, anyone?

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On 02/01/2009 at 05:13, xxxxxxxx wrote:

Hey, I just got the very same problem.
Found any solution yet?

Or is there working example code for the MCOMMAND_TRIANGULATE? Can't get that to work, either.

Thanks in advance!

Cheers,
Jack

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On 06/01/2009 at 03:23, xxxxxxxx wrote:

Triangulate() is not really meant to be used for existing polygon meshes but rather for example to create triangles from a point cloud.

> Quote: _Or is there working example code for the MCOMMAND_TRIANGULATE?
>
> * * *
_


That's actually pretty easy, here an example:

> \> Bool MenuTest::Execute(BaseDocument \*doc) \> { \>      StopAllThreads(); \> \>      BaseObject \*op = doc->GetActiveObject(); \>      if(!op) return TRUE; \> \>      if(op->GetType() == Opolygon) \>      { \>           ModelingCommandData md; \>           md.doc = doc; \>           md.op = op; \> \>           SendModelingCommand(MCOMMAND_TRIANGULATE, md); \>      } \>       \>      return TRUE; \> } \>

cheers,
Matthias