Revit 2015 is a powerful tool for creating architectural designs and visualizations. One of its key features is the ability to create and view 3D models. Opening a 3D view in Revit 2015 is a quick and easy process that can greatly enhance your design workflow. Here's how to do it:

1. Open your Revit project and navigate to the desired location in the model where you want to view in 3D.

2. In the project browser, locate the 'Project Browser' button and click on it to expand the list of available views.

3. Scroll down and find the '3D Views' category. Click on it to reveal the list of 3D views available in the project.

4. Select the desired 3D view from the list. Revit will then open the 3D view, displaying the model in a three-dimensional space.

5. Once the 3D view is open, you can use the navigation tools to manipulate the view, such as orbiting, panning, and zooming, to get the desired perspective of the model.

Opening a 3D view in Revit 2015 allows you to visualize your design in a more realistic and immersive way. It's a great way to communicate your design ideas to clients and stakeholders, as well as to identify any potential issues or conflicts within the model.

In addition, the 3D view can be used to create stunning renderings and animations, which can be used for presentations and marketing materials. By mastering the process of opening a 3D view in Revit 2015, you can take full advantage of the software's capabilities and elevate the quality of your architectural designs.

In conclusion, opening a 3D view in Revit 2015 is a fundamental skill for architects and designers using the software. With these simple steps, you can quickly and easily access the 3D view of your model, allowing you to explore and present your designs in a more immersive and compelling way. Whether you're a beginner or an experienced Revit user, mastering the process of opening a 3D view will greatly enhance your ability to create and communicate architectural designs.