public Cube()
{
/**注意：构建三角面时，从顺时针方向构建，左手坐标系**/
//top可见使用顺时针
triangles[0] = new Triangle3D(a, b, c);
triangles[1] = new Triangle3D(a, c, d);
//bottom,不可见使用逆时针
triangles[2] = new Triangle3D(e, h, f);
triangles[3] = new Triangle3D(f, h, g);
//front可见使用顺时针
triangles[4] = new Triangle3D(d, c, g);
triangles[5] = new Triangle3D(d, g, h);
//back不可见使用逆时针
triangles[6] = new Triangle3D(a, e, b);
triangles[7] = new Triangle3D(b, e, f);
//right可见使用顺时针
triangles[8] = new Triangle3D(b, f, c);
triangles[9] = new Triangle3D(c, f, g);
//left不可见使用逆时针
triangles[10] = new Triangle3D(a, d, h);
triangles[11] = new Triangle3D(a, h, e);
}
private void Form1_Load(object sender, EventArgs e)
{
//注意 w 的值为1 才能进行正常的矩阵变换
//z 为 0
Vector4 a = new Vector4(0, 0.5, 0, 1);//此时三角形顶点朝下
Vector4 b = new Vector4(0.5, -0.5, 0, 1);
Vector4 c = new Vector4(-0.5, -0.5, 0, 1);
t = new Triangle3D(a, b, c);
}