To access the 3D view in Revit, follow these simple steps:

1. Open your Revit project and navigate to the desired floor plan or elevation view.

2. On the toolbar at the bottom of the screen, click on the '3D View' button. This will switch the current view to the 3D perspective.

3. You can also use the keyboard shortcut 'DA' to quickly access the default 3D view.

Once in the 3D view, you can navigate and visualize your design in a 3D environment, making it easier to understand the spatial relationships and make necessary adjustments. Happy modeling!