关于使用D3DXCreateMeshFVF的怪问题！

[chisoft]

LPD3DXMESH pMeshTemp = NULL;
int n=100;

if( FAILED( hr = D3DXCreateMeshFVF( n*n, n*n* 3,
0, D3DFVF_XYZ | D3DFVF_NORMAL, m_pd3dDevice, &pMeshTemp ) ) )
{
return;
}


以上语句当n小于120时都是对的，但n>120时就报错 hr=D3DERR_INVALIDCALL

为什么？请高手指教！谢谢！

[zhangyan_qd]

查查caps，看和vertex buffer有关的几个cap值是多少，有没有超过的。

[chisoft]

cap是什么呀？


以下是我的代码：


// Create the D3D object.
if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
return E_FAIL;

// Get the current desktop display mode, so we can set up a back
// buffer of the same format
D3DDISPLAYMODE d3ddm;
if( FAILED( g_pD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &d3ddm ) ) )
return E_FAIL;

// Set up the structure used to create the D3DDevice
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory( &d3dpp, sizeof(d3dpp) );
d3dpp.Windowed = TRUE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferFormat = d3ddm.Format;


// Create the D3DDevice
if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &g_pd3dDevice ) ) )
{
return E_FAIL;
}


LPD3DXMESH pMeshTemp = NULL;
int n=100;

if( FAILED( D3DXCreateMeshFVF( n*n, n*n* 3,
0, D3DFVF_XYZ | D3DFVF_NORMAL, g_pD3D, &pMeshTemp ) ) )
{
return E_FAIL;
}


没有涉及什么caps呀！

是不是要设置一些参数呀？

[chisoft]

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