The Live Viewer window is one of the most important parts of Octane (figure 1). It displays all the elements in a scene in real time. This section explores all the features of Live Viewer. LV provides lots of functionality related to materials, textures, light and camera creation, selections, DOFThe distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions. source: wikipedia (https://en.wikipedia.org/wiki/Depth_of_field) adjustment, viewing of motion blur, assigning of materials to objects, copying, pasting, and much more.
Figure 1: The Live Viewer window.