plot_3d_surfaces("3DBox","3D box","x","y","z","surface 1",false,"red","red",null,"red","red",null,"u",-5,5,1,"v",-5,5,1,"u","v","5","surface 2",false,"green","green",null,"green","green",null,"u",-5,5,1,"v",-5,5,1,"u","5","v","surface 3",false,"yellow","yellow",null,"yellow","yellow",null,"u",-5,5,1,"v",-5,5,1,"5","u","v","surface 4",false,"blue","blue",null,"blue","blue",null,"u",-5,5,1,"v",-5,5,1,"u","v","-5","surface 5",false,"magenta","magenta",null,"magenta","magenta",null,"u",-5,5,1,"v",-5,5,1,"u","-5","v","surface 6",false,"cyan","cyan",null,"cyan","cyan",null,"u",-5,5,1,"v",-5,5,1,"-5","u","v")

隐藏了坐标轴后，和C语言一模一样，也可以旋转，缩放

厉害！好强大！可是这个函数是未公开函数吗。。。？

我的怎么显示图像设置有问题无法绘制。帮助文档中不是说明8.z值最小的时候的颜色； 9.最小的z值，你的代码中怎么两个red连续出现？

搞错了，搞错了，plot_3d_surfaces确实是隐藏的函数，它的公开版本是plot3d。plot_3d_surfaces是用JAVA实现的内建函数，plot3d是用MFP自己实现的预定的函数。由于plot3d是由mfp写的，它的速度要慢一些，不过用户也可以通过这个函数代码学习如何编写强大的绘图程序。
plot3d和plot_3d_surfaces的用法差不多，不同的地方在于plot_3d_surfaces可以设置一个表面正反不同的颜色，plot3d正反的颜色和颜色变化方式必须一致。由于这个原因，plot_3d_surface比plot3d在绘制每天曲面时，多出2个参数，这也是楼上出错的原因。
调用plot3d绘制同样的立方体的代码如下：
plot3d("3dBox", "3D Box", "x", "y", "z", _
"", false, "red", null, "red", null, -5, 5, 10, -5, 5, 10, "u", "v", "5", _
"", false, "green", null, "green", null, -5, 5, 10, -5, 5, 10, "u", "5", "v", _
"", false, "blue", null, "blue", null, -5, 5, 10, -5, 5, 10, "5", "u", "v", _
"", false, "yellow", null, "yellow", null, -5, 5, 10, -5, 5, 10, "u", "v", "-5", _
"", false, "cyan", null, "cyan", null, -5, 5, 10, -5, 5, 10, "u", "-5", "v", _
"", false, "magenta", null, "magenta", null, -5, 5, 10, -5, 5, 10, "-5", "u", "v")
绘制结果为：