OptionaldataURIAn image encoded as base64 string, starting with data:image.
OptionalhrefURL to the returned image. Must be an absolute URL or a relative path starting with "./".
OptionalprimitiveSpecifies the type of symbol used. Must be one of the following values: circle, square, cross, x, kite.
The shape (primitive) or image URL (href) used to visualize the features.
See https://developers.arcgis.com/web-scene-specification/objects/iconSymbol3DLayer_resource/.