分形之二叉树（Binary Tree）

上一篇文章讲的是分形之树（Tree），这一篇中将其简化一下，来展示二叉分形树的生长过程。

核心代码:

static void FractalBinaryTree(const Vector3& vStart, const Vector3& vEnd, Yreal angle, Yreal branch_c, Vector3* pVertices)
{
    Vector3 vSub = vEnd - vStart;
    Yreal len = D3DXVec3Length(&vSub);
    Yreal alfa = atan2f(vSub.y, vSub.x);

    Yreal branch = len*branch_c;

    pVertices[0] = vEnd;
    pVertices[1].x = pVertices[0].x + branch*cosf(alfa - angle);
    pVertices[1].y = pVertices[0].y + branch*sinf(alfa - angle);
    pVertices[1].z = 0.0f;

    pVertices[2] = vEnd;
    pVertices[3].x = pVertices[2].x + branch*cosf(alfa + angle);
    pVertices[3].y = pVertices[2].y + branch*sinf(alfa + angle);
    pVertices[3].z = 0.0f;
}