R Under development (unstable) (2024-03-02 r86034 ucrt) -- "Unsuffered Consequences"
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> library(rgl)
> tet <- tetrahedron3d()
> 
> open3d()
wgl 
  1 
> segments3d(t(tet$vb[1:3,]), indices = c(1,2,1,3,1,4,2,3,2,4,3,4))
> 
> open3d()
wgl 
  2 
> text3d(t(tet$vb[1:3,]), text=1:4)
> triangles3d(t(tet$vb[1:3,]), indices = c(1,2,3,1,4,2,1,3,4,2,4,3),
+             col = "red")
> 
> # This displayed a triangle for the red quad (issue #154)
> 
> quad <- cbind(x = c(-1, 1, 1, -1),
+               y = c( 0, 0, 0, 0),
+               z = c(-1, -1, 1, 1))/2
> open3d()
wgl 
  3 
> triangles3d(quad, alpha = 0.5, col = "red", indices=c(1,2,3,1,3,4))
> id <- triangles3d(quad+1, col = "blue", indices=c(1,2,3,1,3,4))
> 
> # These signalled errors or warnings
> 
> tri <- as.triangles3d(id)
> m <- as.mesh3d(id)
> 
> filename <- tempfile(fileext = ".ply")
> writePLY(filename)
> unlink(filename)
> 
> filename <- tempfile(fileext = ".obj")
> writeOBJ(filename, separateObjects = FALSE)
> readOBJ(filename)
 mesh3d object with 8 vertices, 4 triangles.
> unlink(filename)
> 
> filename <- tempfile(fileext = ".stl")
> writeSTL(filename)
> readSTL(filename)
> unlink(filename)
> 
> proc.time()
   user  system elapsed 
   0.34    0.18    0.48