R Under development (unstable) (2024-03-03 r86036 ucrt) -- "Unsuffered Consequences"
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> library(rgl)
> 
> # WORKING
> 
> x <- cube3d()
> b <- getBoundary3d(x)
> open3d(); shade3d(b)
wgl 
  1 
> 
> 
> x <- cube3d()
> x$ib <- x$ib[,-(1:2)]
> b <- getBoundary3d(x)
> open3d(); shade3d(x, alpha=0.2, col = "blue"); shade3d(b) 
wgl 
  2 
> 
> x <- cube3d()
> x$ib <- x$ib[,-(1:2)]
> b <- getBoundary3d(x, sorted = TRUE, simplify = FALSE)
> open3d(); shade3d(x, alpha=0.2, col = "blue"); shade3d(b) 
wgl 
  3 
> 
> proc.time()
   user  system elapsed 
   0.34    0.14    0.46