问题描述

DX绘制一个椎体，麻烦大家给看看，顶点和索引序列有问题么？

const int circlePoints = 4;//锥低边的定点数
const int radiu = 1;//锥底半径

VB->Lock(0 0 (void**)&vertices 0);

// vertices of a unit centrumfor (int i = 0;i<=circlePoints+1;i++){    if (i==0)    {        vertices[i] = ColorVertex(0.0f 1.0f 0.0fD3DCOLOR_XRGB(02550));    }else if (i==1)    {        vertices[i] = ColorVertex(0.0f -1.0f 0.0fD3DCOLOR_XRGB(00255));    }    else{        vertices[i] = ColorVertex(radiu*cos((i - 2)*2*D3DX_PI/circlePoints) -1.0f radiu*sin((i - 2)*2*D3DX_PI/circlePoints)D3DCOLOR_XRGB(25500));    }}VB->Unlock();// define the triangles of the cube:WORD* indices = 0;IB->Lock(0 0 (void**)&indices 0);for (int j=0;j < circlePoints;j++){    if(j==circlePoints - 1)    {        indices[j*6] = j%2 == 0?0:j+2; indices[j*6+1] = j%2 == 0?j+2:0; indices[j*6+2] = j%2 == 0?2:2;        indices[j*6+3] = j%2 == 0?1:j+2; indices[j*6+4] = j%2 == 0?j+2:1; indices[j*6+5] = j%2 == 0?2:2;    }     else    {        indices[j*6] = j%2 == 0?0:j+2; indices[j*6+1] = j%2 == 0?j+2:0; indices[j*6+2] = j%2 == 0?j+3:j+3;        indices[j*6+3] = j%2 == 0?1:j+2; indices[j*6+4] = j%2 == 0?j+2:1; indices[j*6+5] = j%2 == 0?j+3:j+3;    }}可是就是画不出来，当circlePoints是3的时候能画出来一个面，其它值什么都没有