[R] how to remove the framebox out the 3D scatter plot?

[Jinsong Zhao]

Hellow,

I plot a 3D scatter plot using cloud function in lattice package. 
Although, I have read the help of cloud, and panel.cloud, 
I did not find a way to remove the framebox out the 3D scatter plot.

Any help?

Thanks in advance!

Best wishes,

Jinsong