求助一下各位高手,关于ID3DXMesh的GetVertexBuffer的问题

leftnoteasy

我是想把ID3DXMesh的VertexBuffer和IndexBuffer得到,然后通过DrawIndexedPrimitive进行渲染.
下面是部分的代码:

1. 
   
2. //顶点的定义
   
3. struct Vertex
   
4. {
   
5.         Vertex() { }
   
6.         Vertex(float x, float y, float z)
   
7.         {
   
8.                 _x = x;
   
9.                 _y = y;
   
10.                 _z = z;
    
11.         }
    
12. 
    
13.         float _x;
    
14.         float _y;
    
15.         float _z;
    
16. 
    
17.         static const DWORD FVF;
    
18. };
    
19. 
    
20. //模型的建立和Vertex/IndexBuffer的获取
    
21. D3DXCreateTeapot(g_pD3DDevice,&g_mesh,0);
    
22. g_mesh->GetVertexBuffer(&g_pVB);
    
23. g_mesh->GetIndexBuffer(&g_pIB);
    
24. 
    
25. //模型的绘制
    
26. if (g_pD3DDevice->Clear(0, 0, D3DCLEAR_TARGET,
    
27.                         0xffffffff,1.0f,0) == D3D_OK)
    
28. {
    
29.     g_pD3DDevice->BeginScene();
    
30. 
    
31.     g_pD3DDevice->SetStreamSource(0,g_pVB,0,sizeof(Vertex));
    
32.     g_pD3DDevice->SetIndices(g_pIB);
    
33.     g_pD3DDevice->SetFVF(g_mesh->GetFVF());
    
34. 
    
35.     g_pD3DDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,0,g_mesh->GetNumVertices(),0,g_mesh->GetNumFaces());
    
36. 
    
37.     g_pD3DDevice->EndScene();
    
38.     g_pD3DDevice->Present(0,0,0,0);
    
39. }
    

复制代码

绘制的方式是用的线框模式,所出现的问题:
本来茶壶顶点挺稀疏的一个模型,绘制出来看起来密密麻麻的一堆顶点,我猜想是FVF不匹配的问题,是不是如果要正常使用VertexBuffer里面的顶点,所定义的Struct Vertex必须匹配?
谢谢大家

我是菜鸟2005

  g_mesh->GetVertexBuffer(&g_pVB);
  g_mesh->GetIndexBuffer(&g_pIB);
........................................       
  g_pd3dDevice->SetStreamSource(0, g_pVB, 0, g_mesh->GetNumBytesPerVertex());
  g_pd3dDevice->SetIndices(g_pIB);
  g_pd3dDevice->SetFVF( g_mesh->GetFVF() );
  g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0,0, g_mesh->GetNumVertices(), 0, g_mesh->GetNumFaces() );

leftnoteasy

我是菜鸟2005: Re:求助一下各位高手,关于ID3DXMesh的GetVertexBuffer的问题

  g_mesh->GetVertexBuffer(&g_pVB);
  g_mesh->GetIndexBuffer(&g_pIB);
..................

谢谢了,原来是对应的Vertex传进去的大小不正确造成的