Substance 3D Stager uses the Adobe Mercury Render Engine. Mercury is a mixed technique renderer, allowing users to switch between real-time rendering and ray tracing. Each option has shared settings for seamless transition between modes. Real time rendering prioritizes interactive frame rates while still striving for the best looks possible, making it a great choice for test renders, mock ups, and quick turn arounds on projects. Ray tracing is a powerful rendering technique that shoots digital light rays through a scene to more accurately obtain scene information and mimic real-world lighting scenarios.