[igraph] How to make two 3D images at the same coordinate in a rgl device?

[Zhijiang Wang]

Dear all members,

I want to visualize two 3D images at the same coordinate in a rgl device.
1st 3D plot:
            I use rglplot, the coordinate is [-1,1]X[-1,1]X[-1,1]
2nt 3D image:
            I use contour3d(...)
                  drawScene.rgl(...scale = c(181,217,181))

Now, the problem is the 1st plot is in (-1, 1), but the 2nd plot can not be transformed into one like the 1st one.
The 2nt 3D image looks large than the 1st one.

Great thansk!

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Best wishes,

Zhijiang Wang