Thea for SketchUp offers two rendering modes: Interactive Mode and Production Mode.
IR modes allow you to not only render the model as a static image, but also interactively move the camera around the model, adjust shadows and materials, modify the model, and see the rendering being updated. Engines that offer Interactive Mode are: Presto & Adaptive AMC.
PR mode is used for final renderings where changes to the scene do not affect the final image while rendering. All engines can be used in Production Mode (Presto, Adaptive AMC, Adaptive BSD, Unbiased TR1/TR2).