Direct3D学习（一）：3D Sierpinski镂垫绘制

自己几何也太差劲了，时间都花在计算坐标位置上了

图片附件: Sierpinski.JPG (2007-3-29 00:56, 39.68 K)

附件: D3DStudy.exe (2007-3-29 00:56, 64 K)

主要算法，就是个递归：

/***************************************
*三角形绘制
*vertex[3]
***************************************/
inline void DrawTriangle(CustomVertex vertex[])
{
    //拷贝到顶点缓存
    memcpy(pVertices,vertex,3 * sizeof(CustomVertex));
    g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST,0,1);
}

/****************************************
*Sierpinski镂垫绘制
*deepth:递归深度
****************************************/
void DrawSierpinski(CustomVertex vertex[],int deepth)
{
    if(deepth == 0)
    {
        DrawTriangle(vertex);
        return;
    }else
    {
        //计算中点
        CustomVertex midVertex[] =
        {
            {(vertex[1].x + vertex[2].x)/2,(vertex[1].y + vertex[2].y)/2,(vertex[1].z + vertex[2].z)/2,vertex[0].color},
            {(vertex[0].x + vertex[2].x)/2,(vertex[0].y + vertex[2].y)/2,(vertex[0].z + vertex[2].z)/2,vertex[1].color},
            {(vertex[1].x + vertex[0].x)/2,(vertex[1].y + vertex[0].y)/2,(vertex[1].z + vertex[0].z)/2,vertex[2].color}
        };

        CustomVertex tempVertex[3];
        //分三部分进行递归绘制
        tempVertex[0] = vertex[0];
        tempVertex[1] = midVertex[2];
        tempVertex[2] = midVertex[1];
        DrawSierpinski(tempVertex,deepth - 1);

        tempVertex[0] = midVertex[2];
        tempVertex[1] = vertex[1];
        tempVertex[2] = midVertex[0];
        DrawSierpinski(tempVertex,deepth - 1);

        tempVertex[0] = midVertex[1];
        tempVertex[1] = midVertex[0];
        tempVertex[2] = vertex[2];
        DrawSierpinski(tempVertex,deepth - 1);
    }
}