Read a glTF file — readglTF • rgl2gltf

The glTF file is the JSON part of a glTF representation of a 3D scene. This function reads one and returns a "gltf" object containing the information in R format.

Typically most of the data for the scene is contained in other files named in this one, usually found in the same file folder.

readglTF(path, defaultbin = NULL, ...)

Arguments

path: The path to the file being read. R connections cannot be used.
defaultbin: The name of the default associated binary file, if it is not named in the JSON. This is typically used when the JSON has been extracted from a GLB file.
...: Not currently used.

Value

An object of class "gltf".

References

The specification of the glTF format: https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html

Author

Duncan Murdoch

Examples

# This web page has lots of sample files

samples <- "https://raw.githubusercontent.com/KhronosGroup/glTF-Sample-Models/master/2.0"
filename <- tempfile(fileext = ".gltf")

# Get one of them:  a 2 cylinder engine.  We need both parts
# to be able to view it, though only the .gltf part is
# needed for readglTF()

download.file(paste0(samples, "/2CylinderEngine/glTF/2CylinderEngine.gltf"),
  destfile = filename)
download.file(paste0(samples, "/2CylinderEngine/glTF/2CylinderEngine0.bin?raw=true"),
  destfile = file.path(tempdir(), "2CylinderEngine0.bin"),
  mode = "wb")

gltf <- readglTF(filename)
gltf
#> asset fields:
#>   GLtf version 2.0 file.
#>   Generated by COLLADA2GLTF.
#> Scenes ( 1 )
#> Nodes ( 82 )
#> Buffers ( 1 )
#> Bufferviews ( 2 )
#> Meshes ( 29 )
#> Cameras ( 1 )
#> Accessors ( 102 )
#> Materials ( 34 )

# gltf files contain references to other files using
# relative paths, so we can only use them from their
# own directory
olddir <- setwd(dirname(filename))
rgl::plot3d(gltf)

setwd(olddir)