The Ray Trace visual style is a photorealistic rendering mode that allows panning and zooming with your Revit model.
While using the Ray Trace visual style, the rendering of the model starts at a low resolution, but quickly increases fidelity to appear more photorealistic. You have the option to set lighting, photographic exposure, and background from the Graphic Display Options dialog during or before entering Ray Trace mode. You can use the View Cube, Navigation Wheel, and other camera operations to interactively walkthrough your model.
The Progressive Ray Trace Mode begins by caching all the model information. The time to cache varies depending on the model's size and complexity. The rendering automatically starts at a draft resolution and, within seconds, appears increasingly more photorealistic. The rendering continues to a high-quality, photorealistic image until it is explicitly stopped.
You can change view settings such as background, exposure, and light scheme, in the Graphic Display Options dialog without exiting Ray Trace mode. Also, you can orbit, zoom, pan, or re-orient the camera, using the view cube or the navigation wheel. Once a new camera angle is set, the rendering process automatically restarts.