[Closed] SDK soft selection data for editable poly?

exactly the same function

float* MNMesh::getVSelectionWeights( )

This works when the object the modifier is applied to is an editable mesh, but not when it is an editable poly:

void TestModifier::ModifyObject(TimeValue t, ModContext &mc, ObjectState *os, INode *node) {
  TriObject *triOb = reinterpret_cast<TriObject *>(os->obj);
  Mesh& mesh = triOb->GetMesh();
  float *weights = mesh.getVSelectionWeights();

  for (int i = 0; i < mesh.getNumVerts(); i++) { mprintf(_T("%f, "), weights[i]); }
  mprintf("
");
}

What do I need to change to make it work for an editable poly?

this is the generic method for handling meshes of all types (there are a few “specialised” cases

Object *obj = os->obj;
   	if(!obj) return;
   
   	if (obj->IsSubClassOf(triObjectClassID))  // Handle any triobject types
   	{
   		TriObject* triobj = (TriObject*)obj;
   		......
   	}
   	else if (obj->IsSubClassOf(polyObjectClassID)) // Handle any PolyObject types
   	{
   		PolyObject* polyObj = (PolyObject*)obj;
  	   ........
   	}
   	else if (obj->CanConvertToType(triObjectClassID)) // all others box/geosphere/etc should try to convert to a triobject, 
   	{
   		TriObject  *triOb = (TriObject *)obj->ConvertToType(t, triObjectClassID);
   		// Now stuff this into the pipeline!
   		os->obj = triOb;
   		.........
   	}

i usual then just have 2 Overloaded functions that handle tri & poly objects respectively

Hm. When I try to use

obj->IsSubClassOf(polyObjectClassID)

it gives me the following error:

1>TestModifier.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) class Class_ID polyObjectClassID" (__imp_?polyObjectClassID@@3VClass_ID@@A)
1>C:\Program Files\Autodesk\3ds Max 2012\plugins\TestModifier.dlm : fatal error LNK1120: 1 unresolved externals

You have to include “polyobj.h” in your project.

It is included…

EDIT:
Also, polyObjectClassID on its own is not a problem, it is only when used with IsSubClassOf that I am having a problem.

EDIT (AGAIN):
For my current purposes, I have it working by replacing the condition with

if (obj->ClassID() == EPOLYOBJ_CLASS_ID) {
...
}

but obviously I would still like to get it working the other way.

it gives me the following error:

thats a linker error you need to add the additional dependencies is the linker part of the project props

poly.lib
mnmath.lib

Also, I am still not sure what I’m supposed to do in order to use the getVSelectionWeights method with a PolyObject, since, for example,

Mesh& mesh = polyOb->GetMesh();

will not compile.

Edit:
(Thanks for the linker info. I have no idea how someone would know to do that.)

Okay, got it working. I was wondering what MNMesh was all about, and still have some research to do, but at least I’m off to a start now (if a bumpy one).