The Accumulated slave component of a Loop outputs the combined result of all previous loop iterations, which is then combined with the result of the current iteration and fed into Loop's Accumulator input. This component can output HDR colors.
This slave component must be connected to the subtree of its master's Accumulator input through a subtree of components, not directly. The connection between this slave component and its master Loop component must not be routed through any bitmap-based components.
For general information about slave components, see Slave components.
The starting color or image, which defines the output of the Accumulated slave component for the first loop iteration. This input can accept HDR colors.
Iteration (preview):
This slider allows you to preview the output of this slave component for any loop iteration, which is useful for creating and debugging the loop subtree. The values of the Iteration (Preview) sliders are synchronized across all slave components of Loop. The maximum value for this slider is defined by the Iterations input of the master Loop component.
Technically, this slider defines the output of the slave component in situations when it is sampled by any component which is not its master.