SCNBufferStream
An object that manages a Metal buffer used by a custom shader program.
Declaration
protocol SCNBufferStream : NSObjectProtocolOverview
Your app does not define classes that implement this protocol. Instead, you use the SCNProgram method handleBinding(ofBufferNamed:frequency:handler:) to register a block to be called by SceneKit. In that block, SceneKit provides a buffer stream object that you can use to write data to the buffer.