`scatterplot3d`：无法将回归平面添加到三维散点图中

I have created a 3d Scatterplot in R and want to add a regression plane. I have looked at code from the statmethods.net website, which can be very useful, and it worked. I then tried it with my own data and the plane did not show up.I have created a 3d Scatterplot in R and want t