ID3DXMesh接口 创建自己的立方体网格

D3DXCreateMeshFVF

首先创建一个ID3DXMesh接口。 ID3DXMesh接口的说明可以参数龙书。

这里主要是用代码来讲解：

#define VERTEX_FVF   (D3DFVF_XYZ | D3DFVF_TEX1)

	hr = D3DXCreateMeshFVF(
		12,
		24,
		D3DXMESH_MANAGED,
		VERTEX_FVF,
		m_pd3dDevice,
		&pMesh
		);

VERTEX vertices[] = 
	{
		//正y面?
		{-5.0f, -5.0f, 0.0f, 0,1}, 
		{-5.0f, 5.0f, 0.0f, 0,0},
		{5.0f, 5.0f, 0.0f,1,0}, 
		{5.0f, -5.0f, 0.0f, 1,1},  
		//侧¨¤面?r
		{5.0f, -5.0f, 0.0f, 0,1}, 
		{5.0f, 5.0f, 0.0f,0,0}, 
		{5.0f, 5.0f, 10.0f,1,0}, 
		{5.0f, -5.0f, 10.0f, 1,1}, 
		//后¨®面?
		{5.0f, -5.0f, 10.0f, 0,1}, 
		{5.0f, 5.0f, 10.0f,0,0}, 
		{-5.0f, 5.0f, 10.0f, 1,0},
		{-5.0f, -5.0f, 10.0f, 1,1}, 

		{-5.0f, -5.0f, 10.0f, 0,1},
		{-5.0f, 5.0f, 10.0f, 0,0},
		{-5.0f, 5.0f, 0.0f, 1,0}, 
		{-5.0f, -5.0f, 0.0f, 1,1},

		{-5.0f, 5.0f, 0.0f, 0,1},
		{-5.0f, 5.0f, 10.0f, 0,0},
		{5.0f, 5.0f, 10.0f, 1,0},
		{5.0f, 5.0f, 0.0f, 1,1},

	/*	{-5.0f, -5.0f, 0.0f, 0,1}, 
		{-5.0f, -5.0f, 10.0f, 0,0}, 
		{5.0f, -5.0f, 10.0f, 1,0}, 
		{5.0f, -5.0f, 0.0f, 1,1}*/


		{-5.0f, -5.0f, 0.0f, 0,1}, 
		{5.0f, -5.0f, 0.0f, 0,0},
		{5.0f, -5.0f, 10.0f, 1,0}, 
		{-5.0f, -5.0f, 10.0f, 1,1},  //底下的面。需要用逆时针。不然会被剔除
	};

把上面的顶点数据拷贝到 网格里面
	void* pBuffer;
	pMesh->LockVertexBuffer(0,(void**)&pBuffer);
	memcpy(pBuffer,vertices,sizeof(vertices));
	pMesh->UnlockVertexBuffer();

接着创建 索引数据
	WORD* i = 0;   
	pMesh->LockIndexBuffer(0, (void**)&i);   

	// fill in the front face index data   
	i[0] = 0; i[1] = 1; i[2] = 2;   
	i[3] = 0; i[4] = 2; i[5] = 3;   

	// fill in the back face index data   
	i[6] = 4; i[7]  = 5; i[8]  = 6;   
	i[9] = 4; i[10] = 6; i[11] = 7;   

	// fill in the top face index data   
	i[12] = 8; i[13] =  9; i[14] = 10;   
	i[15] = 8; i[16] = 10; i[17] = 11;   

	// fill in the bottom face index data   
	i[18] = 12; i[19] = 13; i[20] = 14;   
	i[21] = 12; i[22] = 14; i[23] = 15;   

	// fill in the left face index data   
	i[24] = 16; i[25] = 17; i[26] = 18;   
	i[27] = 16; i[28] = 18; i[29] = 19;   

	// fill in the right face index data   
	i[30] = 20; i[31] = 21; i[32] = 22;   
	i[33] = 20; i[34] = 22; i[35] = 23;   

	pMesh->UnlockIndexBuffer();   

//下面是创建了6个集合，创建多少个接口。后面就需要绘制几个集合
DWORD* attributeEuffer = 0;
	pMesh->LockAttributeBuffer(0,&attributeEuffer);
	for ( int a = 0; a < 2; a++)
	{
		attributeEuffer[a] = 0;
	}
	for ( int b = 2; b < 4; b++)
	{
		attributeEuffer[b] = 1;
	}
	for ( int c = 4; c < 6; c++)
	{
		attributeEuffer[c] = 2;
	}


//优化
	hr = pMesh->OptimizeInplace(         
		D3DXMESHOPT_ATTRSORT |   
		D3DXMESHOPT_COMPACT  |   
		D3DXMESHOPT_VERTEXCACHE,   
		&adjacencyBuffer[0],   
		0, 0, 0);   

	for ( int c = 6; c < 8; c++)
	{
		attributeEuffer[c] = 3;
	}

	for ( int c = 8; c < 10; c++)
	{
		attributeEuffer[c] = 4;
	}

	for ( int c = 10; c < 12; c++)
	{
		attributeEuffer[c] = 5;
	}
	pMesh->UnlockAttributeBuffer();

	std::vector<DWORD> adjacencyBuffer(pMesh->GetNumFaces() * 3);   
	pMesh->GenerateAdjacency(0.0f, &adjacencyBuffer[0]);   

for(int i = 0; i < 6; i++)   
	{ 
		pMesh->DrawSubset( i );   
	}