[Closed] Get Mesh or MNMesh of Editable Poly after NURMS subdiv

grab a copy of the mnmesh and run SmoothByCreases on it ?

This is an auto-smooth algorithm that allows the developer to specify exactly which edges should be creases and which should be smoothed across. All face smoothing groups are rewritten by this algorithm. This algorithm is used, for example, in MeshSmooth, NURMS style, when the user turns on “smooth result” and applies crease values to some edges.

see

void EditPolyObject::UpdateSubdivResult (TimeValue t)  

in polyedit.cpp

I want to get it. Not to make.

The idea is to find a way to get a MNMesh that already made and prepared for preview.
For high poly models it takes a time to do tessellation. The result is stored in the poly object but there is no easy access to it.

PolyObject::GetRenderMesh will return the subdivision mesh

Object *EditPolyObject::ConvertToType (TimeValue t, Class_ID obtype)

sets it’s mnmesh to subdivResult if subdiv is set
then calls

Object *ret = pobj->ConvertToType (t, obtype);

which should default to (return this)

so a call of
pobj->ConvertToType (t, polyObjectClassID)

should return a polyobject with the mnmesh set to subdivResult of pobj

Just run a test and it works btw.

def_struct_primitive(polyop_OutToMesh, polyop, "OutToMesh");


Value* polyop_OutToMesh_cf(Value** arg_list, int count)
{
	check_arg_count(OutToMesh, 1, count);
	if (arg_list[0]->is_kind_of(class_tag(MAXNode))) 
	{
		get_valid_node(arg_list[0], OutToMesh);
		Object* obj = ((MAXNode*)arg_list[0])->to_node()->GetObjectRef();
		Object* base_obj = Get_Object_Or_XRef_BaseObject(obj);
		if (base_obj->ClassID() != EPOLYOBJ_CLASS_ID)
			throw RuntimeError (GetString(IDS_POLY_OPERATION_ON_NONPOLY), obj->GetObjectName());

		PolyObject* pobj = (PolyObject*)((PolyObject*)base_obj)->ConvertToType(0,polyObjectClassID);
		MNMesh& pmesh = pobj->GetMesh();
		TriObject* tobj = CreateNewTriObject();
		if(tobj)
		{
			INode* node = NULL;
			node = MAXScript_interface->CreateObjectNode(tobj);
			if(!node)
				tobj->DeleteThis();
			else
				pmesh.OutToTri(tobj->GetMesh());
			if(pobj != base_obj) // if no subdiv then no delete
				pobj->DeleteThis();
			if(node)
				return MAXNode::intern(node);
		}
		return &undefined;
	}
	
	return &undefined;
}