.check3d

Mostly for internal use, this function returns the current device
number if one exists, or opens a new device and returns that.

Provides medium to high level functions for 3D interactive graphics, including
    functions modelled on base graphics (plot3d(), etc.) as well as functions for 
    constructing representations of geometric objects (cube3d(), etc.).  Output
    may be on screen using OpenGL, or to various standard 3D file formats including 
    WebGL, PLY, OBJ, STL as well as 2D image formats, including PNG, Postscript, SVG, PGF.

.check3d: Check for an open rgl window.

Description

Usage

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Value

See Also