DX　instancing绘制
当有一个物体，需要绘制该物体的100个instancing时，设置如下：

C/C++ code

    pd3dDevice->SetStreamSource(0, vb, 0, sizeof(Vertex));    pd3dDevice->SetStreamSourceFreq(0, D3DSTREAMSOURCE_INDEXEDDATA | (UINT)100));//设置实例数            pd3dDevice->SetStreamSource(1, g_pVBInstanceData, 0, sizeof(Instance));    pd3dDevice->SetStreamSourceFreq(1, D3DSTREAMSOURCE_INSTANCEDATA | 1UL);//设置实例绘制频率？    pd3dDevice->SetIndices(ib));//设置索引

请问其有3个物体，每个物体的实例数都为100时，StreamNumber应该分别怎么设置？

[解决办法]
三个物体，每个物体都是两个StreamNumber 0和1，如果顶点格式一样，一次设置，三次绘制。

C/C++ code

pd3dDevice->SetStreamSourceFreq(0, D3DSTREAMSOURCE_INDEXEDDATA | (UINT)100));//设置实例数       pd3dDevice->SetStreamSourceFreq(1, D3DSTREAMSOURCE_INSTANCEDATA | 1UL);//设置实例绘制频率？for( int i = 0; i < 3; i++ ){    pd3dDevice->SetStreamSource(0,...);    pd3dDevice->SetIndices(...);    pd3dDevice->DrawIndexedPrimitive（...);}