The Viewport is an updating progressive rendering window. The viewport updates changes to material and light parameters without reloading the scene onto the GPUThe GPU is responsible for displaying graphical elements on a computer display. The GPU plays a key role in the Octane rendering process as the CUDA cores are utilized during the rendering process.. If transformations (move, scale, rotate) are made to the scene geometry, including lights, then the viewport needs to refresh by reloading geometry onto the GPU in order to show these changes. You can access the OctaneRender Viewport from the Octane Menu (Figure 1) or Render Setup window (Figure 2).
Figure 1: Accessing the OctaneRender Viewport from the Octane Menu
Figure 2: Accessing the OctaneRender Viewport from Render Setup