Iray Rendering Modes
Iray Photoreal: This is the photo- and physically realistic mode in Iray, which uses complex global illumination effects. This mode offers a maximum quality but takes longer to calculate the refinement of the image.
Iray Interactive: This raytracing mode uses progressive rendering that allows you to take advantage of the effects of a raytracer without giving up interaction and editing capabilities. This mode does not provide physically realistic rendering.
Blend: Render convergence begins in Interactive mode and then switches to Photoreal mode after a certain level of refinement is achieved. In high-interactivity situations, this mode allows for more fluid interaction while still aiming for increased realism once the interaction has ended. Because both rendering modes are used, this mode consumes more memory resources during the conversion of the scene.