The expression to be evaluated which should
produce a rgl scene.
width
Either "auto", in which case the width will
be calculated (reactively) based on the size of the
glOutput element associated with this function, or a
numeric value representing the width of the desired WebGL
scene in pixels.
height
The height of the WebGL scene. See
width for details.
env
The environment in which expr should be
evaluated.
quoted
Is expr a quoted expression (with
quote())? This is useful if you want to save an
expression in a variable.