The Octane Viewport can render the Unreal® Engine's Point, Spot, and Rect lights natively (figure 1). These lights, in conjunction with the OctaneRender®-specific lights, provide an extensive combination for lighting solutions. The Unreal Directional Light is only recognized by Octane when it is designated as the Selected Directional Light Component in the Octane Render Target Actor's Detail panel while the Environment type is set to Daylight Environment (figure 2).
Figure 1: An Unreal Engine rectangular light rendered in the Octane Viewport
Figure 2: Designating a Directional Light as the Light Component for Sun Mode