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What are Chams?

 
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oib111
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PostPosted: Sun Sep 14, 2008 5:30 pm    Post subject: What are Chams? Reply with quote
Title says it all. As far as I can tell it's like coloring the players in the game. But is it part of the game or is what an external program does?
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Fuzz
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PostPosted: Sun Sep 14, 2008 5:49 pm    Post subject: Reply with quote
It has to do with DirectX hooking
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oib111
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PostPosted: Sun Sep 14, 2008 5:56 pm    Post subject: Reply with quote
As in the program hooks the DirectX rendering function and makes it render out the shape but just in a solid color(s)?
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jackyyll
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PostPosted: Sun Sep 14, 2008 6:07 pm    Post subject: Reply with quote
I think chams are just the clothes they wear...
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Fuzz
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PostPosted: Sun Sep 14, 2008 6:26 pm    Post subject: Reply with quote
oib111 wrote:
As in the program hooks the DirectX rendering function and makes it render out the shape but just in a solid color(s)?


Something like that. I've honestly never looked into it. Just read small bits when i was looking up hooking.
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HalfPrime
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PostPosted: Sun Sep 14, 2008 7:48 pm    Post subject: Reply with quote
AFAIK, chams are the polygon identifiers or something like that. You find the chams of the polygons in each of the hit zones of the models and hook something in directx. In the hook, you'd check to see if what's getting rendered is one of the chams and if so, you'd change the color that gets rendered.
I haven't looked into this, so I'm probably off. I'm pretty sure there sources available if anyone wanted to look into it.
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Noz3001
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PostPosted: Mon Sep 15, 2008 2:25 am    Post subject: Reply with quote
If you're talking about a DX hack for a FPS, chams make player models a bright colour depending on thier team. You can also see them through walls.
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nog_lorp
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PostPosted: Mon Sep 15, 2008 9:03 pm    Post subject: Reply with quote
My understanding was that Chams were the effect of replacing the texture of an object (players) with a solid/simple colored texture. The textures used themselves can be referred to as chams too (my purple chams are prettier... etc).

Lots of people use chams to refer to wallhacks as well, but that is irritating since they are unrelated hacks. You can have chams without wallhacks.
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AndrewMan
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PostPosted: Tue Sep 16, 2008 3:45 pm    Post subject: Reply with quote
DirectX VTable hook using the games device pointer:

Yes, this code is copy + pasted from a forum, click here to see the full link: http://forum.gamedeception.net/showthread.php?t=11101

Code:
#include <Windows.h>
#include <d3d9.h>
#include <detours.h>

#pragma comment (lib, "d3d9.lib")

IDirect3DDevice9 * pGameDevice;

/*
FEARMP.exe
00501838   8B3D F06F5700    MOV EDI,DWORD PTR DS:[576FF0] //Device Pointer
0050183E   8B4C24 14        MOV ECX,DWORD PTR SS:[ESP+14]
00501842   53               PUSH EBX
00501843   8B5C24 10        MOV EBX,DWORD PTR SS:[ESP+10]
00501847   55               PUSH EBP
00501848   8B2F             MOV EBP,DWORD PTR DS:[EDI]
0050184A   8BC3             MOV EAX,EBX
0050184C   E8 CFFBFFFF      CALL FEARMP.00501420
00501851   8B5424 18        MOV EDX,DWORD PTR SS:[ESP+18]
00501855   8B4C24 28        MOV ECX,DWORD PTR SS:[ESP+28]
00501859   50               PUSH EAX
0050185A   8B4424 28        MOV EAX,DWORD PTR SS:[ESP+28]
0050185E   52               PUSH EDX
0050185F   8B5424 28        MOV EDX,DWORD PTR SS:[ESP+28]
00501863   2BC8             SUB ECX,EAX
00501865   51               PUSH ECX
00501866   50               PUSH EAX
00501867   52               PUSH EDX
00501868   8BC3             MOV EAX,EBX
0050186A   E8 91F3FFFF      CALL FEARMP.00500C00
0050186F   50               PUSH EAX
00501870   57               PUSH EDI
00501871   FF95 48010000    CALL DWORD PTR SS:[EBP+148] //call to DrawIndexedPrimitive
*/
/**************************************************************************************************/

////////////////
///BeginScene///
////////////////
typedef HRESULT(WINAPI* BeginScene_)(LPDIRECT3DDEVICE9 pDevice);
BeginScene_ pBeginScene;
HRESULT WINAPI nBeginScene(LPDIRECT3DDEVICE9 pDevice)
{
   _asm NOP;
   HRESULT hRet = pBeginScene(pDevice);
   
   return hRet;
}

/**************************************************************************************************/

//////////////
///EndScene///
//////////////
typedef HRESULT(WINAPI* EndScene_)(LPDIRECT3DDEVICE9 pDevice);
EndScene_ pEndScene;
HRESULT WINAPI nEndScene(LPDIRECT3DDEVICE9 pDevice)
{   
   _asm NOP;
   HRESULT hRet = pEndScene(pDevice);

   return hRet;
}

/**************************************************************************************************/

//////////////////////////
///DrawIndexedPrimitive///
//////////////////////////
typedef HRESULT(WINAPI* DrawIndexedPrimitive_)(LPDIRECT3DDEVICE9 pDevice, D3DPRIMITIVETYPE Type, INT BaseVertexIndex, UINT MinIndex,
                                   UINT NumVertices, UINT StartIndex, UINT PrimitiveCount);
DrawIndexedPrimitive_ pDrawIndexedPrimitive;
HRESULT WINAPI nDrawIndexedPrimitive(LPDIRECT3DDEVICE9 pDevice, D3DPRIMITIVETYPE Type, INT BaseVertexIndex, UINT MinIndex,
                           UINT NumVertices, UINT StartIndex, UINT PrimitiveCount)
{   
   _asm NOP;
   HRESULT hRet = pDrawIndexedPrimitive(pDevice, Type, BaseVertexIndex, MinIndex, NumVertices, StartIndex, PrimitiveCount);
         
   return hRet;
}

/**************************************************************************************************/

/////////////////////
///SetStreamSource///
/////////////////////
typedef HRESULT(WINAPI* SetStreamSource_)(LPDIRECT3DDEVICE9 pDevice, UINT StreamNumber, IDirect3DVertexBuffer9 * pStreamData, UINT OffsetInBytes, UINT Stride);
SetStreamSource_ pSetStreamSource;
HRESULT WINAPI nSetStreamSource(LPDIRECT3DDEVICE9 pDevice, UINT StreamNumber, IDirect3DVertexBuffer9 * pStreamData, UINT OffsetInBytes, UINT Stride)
{   
   _asm NOP;
   HRESULT hRet = pSetStreamSource(pDevice, StreamNumber, pStreamData, OffsetInBytes, Stride);

   return hRet;
}

/**************************************************************************************************/

///////////
///Reset///
///////////
typedef HRESULT(WINAPI* Reset_)(LPDIRECT3DDEVICE9 pDevice, D3DPRESENT_PARAMETERS* pPresentationParameters);
Reset_ pReset;
HRESULT WINAPI nReset(LPDIRECT3DDEVICE9 pDevice, D3DPRESENT_PARAMETERS* pPresentationParameters)
{
   _asm NOP;
   HRESULT hRet = pReset(pDevice, pPresentationParameters);

   return hRet;
}

/**************************************************************************************************/


DWORD dwWait(LPVOID lpArgs)
{
   
   DWORD FearBase = NULL;

   for (;FearBase == NULL;Sleep(100))           
      FearBase = (DWORD)GetModuleHandle("FEARMP.exe");  //get base address for FEARMP.exe
   
   for(;pGameDevice == NULL; Sleep(500))  //do this to allow the game to get spun up, if we don't, pGameDevice will always equal 0x00000000(Necessary for injection on game launch)
   {
      DWORD dwProtect;
      VirtualProtect((void*)(FearBase + 0x176FF0), 4, PAGE_EXECUTE_READWRITE, &dwProtect);
      memcpy(&pGameDevice, (void*)(FearBase + 0x176FF0), 4);
      VirtualProtect((void*)(FearBase + 0x176FF0), 4, dwProtect, NULL);
   }
         
      
   DWORD* pdwNewDevice = (DWORD*)pGameDevice;
   pdwNewDevice = (DWORD*)pdwNewDevice[0];  //turn our pointer into an array for the vtable
   
   
   //Hook accordingly 
   //Note: Requires MS Detours v1.5
   //For further indexes, consult the d3d9.h
   pReset = (Reset_)DetourFunction((PBYTE)pdwNewDevice[16],(PBYTE)nReset);
   pBeginScene = (BeginScene_)DetourFunction((PBYTE)pdwNewDevice[41],(PBYTE)nBeginScene);
   pEndScene = (EndScene_)DetourFunction((PBYTE)pdwNewDevice[42],(PBYTE)nEndScene);
   pDrawIndexedPrimitive = (DrawIndexedPrimitive_)DetourFunction((PBYTE)pdwNewDevice[82],(PBYTE)nDrawIndexedPrimitive);
   pSetStreamSource = (SetStreamSource_)DetourFunction((PBYTE)pdwNewDevice[100],(PBYTE)nSetStreamSource);
   
   return 0;
}

bool WINAPI DllMain(HMODULE hMod, DWORD dwReason, LPVOID lpReserved)
{
   if(dwReason == DLL_PROCESS_ATTACH)
   {
            
      CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)dwWait, NULL, NULL, NULL);
      
      return true;
   }
   
   return false;
}

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oib111
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PostPosted: Tue Sep 16, 2008 3:50 pm    Post subject: Reply with quote
Thanks Smile
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AndrewMan
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PostPosted: Tue Sep 16, 2008 3:59 pm    Post subject: Reply with quote
oib111 wrote:
Thanks Smile


Another tut:
http://www.mpgh.net/forum/31-c_c/28467-d3d9_chams_tutorial.html
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