Options for the Render.set_render_target.
transient:Table<Int, RenderBufferType>
Transient frame buffer types are only valid while the render target is active, i.e becomes undefined when a new target is set by a subsequent call to Render.set_render_target.
Default is all non-transient. Be aware that some hardware uses a combined depth stencil buffer and when this is the case both are considered non-transient if exclusively selected!
A buffer type defined that doesn't exist in the render target is silently ignored