Find which bone a vertice belongs to?

[Von04]

Me and my friend Rick have embarked on a long and tedious process to make a GMF Model Editor. We are actually progressing quite nicely, but have run into a few snags. Does anyone know how to find out which bone a particular vertice is attached to? Thanks in advance.

[VicToMeyeZR]

http://leadwerks.com/wiki/index.php?title=Game_Model_Format#GMF_SDK

 

Also

 

http://leadwerks.com/developer/SDK/

 

 

there is an SDK download. I don't know how relevant it still is.

[Von04]

We are currently using the GMF/SDK. We have progressed to the point where we can Load/Create a model, modify it, and then save it. It all works fine until we try to save an animation, because we are apparently not attaching the vertices to the correct bones. If anyone else has experimented with this any help would be appreciated.

[Josh]

What language are you writing this in?

[Von04]

We are using c++. Everything seems to save fine except for the animations. Here is our save function.

 

#include "stdafx.h"
#include "gmfsdk.h"
using namespace System;
using namespace System::IO;
using namespace System::Runtime::InteropServices;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace Tao::Platform::Windows;
using namespace std;

static int SaveMeshGMF(TMesh mesh,String^ path,TGMFEntity gmfparent=0)	
{
TGMFMesh gmesh;
TGMFSurface	gsurf;
String^ type=gcnew String(GetEntityKey(mesh,"class"));

switch(Convert::ToInt32(GetEntityKey(mesh,"class")))
{
case ENTITY_MESH:
	if(type!="Mesh") break;
	gmesh=GMFMeshCreate(gmfparent);
	GMFNodeSetProperty(gmesh,"name", GetEntityKey(mesh,"name","<None>"));

	for (int s=1; s<Convert::ToInt32(CountSurfaces(mesh)+1);s++)
	{
		TSurface surf=GetSurface(mesh,s);
		gsurf=GMFMeshAddSurface(gmesh);

		int vcount=Convert::ToInt32(CountVertices(surf));
		for(int v=0;v<vcount;v++)
		{
			TVec3 Vertex=GetVertexPosition(surf,v);
			TVec3 VertexN=GetVertexNormal(surf,v);
			TVec4 Color=GetVertexColor(surf,v);
			TVec2 VertexUV=GetVertexTexCoords(surf,v);
			GMFSurfaceAddVertex(gsurf,Vertex.X,Vertex.Y,Vertex.Z,VertexN.X,VertexN.Y,VertexN.Z,VertexUV.X,VertexUV.Y,0.0,0.0,Color.X*255,Color.Y*255,Color.Z*255,Color.W*255);
		   if(AnimationLength(mesh)>0)GMFSurfaceAttachVertex(gsurf,v,gmesh,1);
		}

		int tcount=Convert::ToInt32(CountTriangles(surf));
		for (int t=0;t<tcount;t++)
		{
			GMFSurfaceAddTriangle(gsurf,TriangleVertex(surf,t,0),TriangleVertex(surf,t,1),TriangleVertex(surf,t,2));
		}

		GMFSurfaceCalculateBinormalsAndTangents(gsurf);
		TMaterial gmeshmaterial=GetSurfaceMaterial(surf);
		if(gmeshmaterial)
		{
			str gmeshname=MaterialName(gmeshmaterial);
			if (gmeshname!="")
			{		
				GMFNodeSetProperty (gsurf,"material",gmeshname);
			}
		}
	}

	TVec16 entmat=GetEntityMatrix(mesh); 
	TMat4 bank;
	bank.A0=entmat.A0;
	bank.A1=entmat.A1;
	bank.A2=entmat.A2;
	bank.A3=entmat.A3;
	bank.B0=entmat.B0;
	bank.B1=entmat.B1;
	bank.B2=entmat.B2;
	bank.B3=entmat.B3;
	bank.C0=entmat.C0;
	bank.C1=entmat.C1;
	bank.C2=entmat.C2;
	bank.C3=entmat.C3;
	bank.D0=entmat.D0;
	bank.D1=entmat.D1;
	bank.D2=entmat.D2;
	bank.D3=entmat.D3;
	GMFEntitySetMatrix(gmesh,bank);
}

if(type!="Mesh")
{
	gmesh=GMFBoneCreate(gmfparent);
	TVec3 po=EntityPosition(mesh);
	TVec3 ro=EntityRotation(mesh);
	TVec3 so=EntityScale(mesh);
	GMFNodeSetProperty(gmesh,"name", GetEntityKey(mesh,"name","<None>"));
	GMFEntitySetPositionRotationScale(gmesh,po.X,po.Y,po.Z,ro.X,ro.Y,ro.Z,so.X,so.Y,so.Z);		

	for(int a=0; a < AnimationLength(mesh); a++)
	{
		Animate(mesh,a);
		TVec3 po=EntityPosition(mesh);
		TVec3 ro=EntityRotation(mesh);
		TVec4 qu=EntityQuat(mesh);
		GMFEntityAddQuaternionKey(gmesh,qu.X,qu.Y,qu.Z,qu.W,a);
		GMFEntityAddPositionKey(gmesh, po.X, po.Y, po.Z, a);
		GMFEntityAddRotationKey(gmesh, ro.X, ro.Y, ro.Z, a);
	}
}


for (int c=1;c<CountChildren(mesh)+1;c++)
{		
	SaveMeshGMF(GetChild(mesh,c),path,gmesh);
}


return GMFMeshSaveFile(gmesh,(char*)(void*)Marshal::StringToHGlobalAnsi(path));
};

[VicToMeyeZR]

the reply editor is screwy, I have to manually use the "code" and "/code" tags

[Josh]

Maybe I can add a command for this. It will probably require some funny stuff, like the top-level mesh, the surface, vertex index, and bone index (0-3).

[Niosop]

If you add it to the SDK could you add it to the LE API as well, pretty please?

[Von04]

That would be awesome, thanks Josh!