Optimizing Revit models can greatly enhance work efficiency, reduce hardware resource consumption, and improve overall operational performance. Today, we will discuss key considerations for Revit model optimization, using an MEP model as an example.
1. Check Efficiency
The ‘model graphic style’ setting has the most significant impact on view manipulation tasks such as scrolling, panning, and zooming. Hidden line styles require extensive processing due to the dynamic generation of gaps and hidden lines when elements overlap in a view. This can severely affect the performance of views containing many visible elements. The following best practices help minimize this performance impact and streamline project workflows.
2. Modeling and Drawing Views
To simplify project workflows, it is recommended to create separate model views and drawing views for the same building area. Follow these guidelines:
- Model views should use the “line architecture” graphic style.
- Drawing views should use the “hidden line” graphic style to achieve the appearance needed for documentation.
- Use dependent views for drawing views. This allows you to represent multiple sections of the overall floor in different views without duplicating annotations.
- Assign different names and subcategories to model views and drawing views to logically organize them and ensure correct usage.
- Utilize view templates to simplify view creation and maintain consistency.
- Only in model views with the “line architecture” graphic style, apply pipe fills and colors.
3. Optimize Hidden Line Efficiency
In views with the “hidden line” graphic style, performance is directly related to the number of faces displayed. Although elements appear as 2D lines, they are 3D objects composed of faces processed by Revit’s graphics system and rendered as 2D lines in views. To optimize performance in these views, follow these recommendations:
- Avoid using the “detailed” level of detail in mechanical views when possible, as multiple line representations reduce efficiency. For HVAC systems, displaying pipes as single lines at a “medium” detail level is typically sufficient.
- If complex 3D components are used in architectural service design, disable their visibility in drawing views. Instead, use ‘model lines’ to represent the overall shape of components in the family definition, displayed at the drawing view’s level of detail.
- When using hidden lines, if records are not needed in the file, set the “Mechanical Hidden” values for “Inner Gap” and “Outer Gap” to zero. This greatly improves efficiency.
4. Model Manipulation Efficiency
Revit allows users to create building services models, often consisting of extensive interconnected networks. Its powerful parsing capability and parametric change engine enable data to flow throughout the network during manipulation.
Poorly structured and planned large connectivity networks significantly degrade model manipulation performance. Comparative tests show better performance when the network structure is optimized.
As network size grows, factors affecting model manipulation—such as moving elements, changing flow, or adding new components—become more complex. Understanding these factors and adhering to best practices ensures optimal performance.
5. Establish a Logical System
Create a logical system for connecting the network rather than leaving all elements on the default system. Associating elements with a system simplifies data propagation and supports system analyses like pressure drop calculations.
Testing client models with all elements assigned to the default system demonstrated significant improvements after restructuring connectivity into logical systems.
6. Set Correct Flow Direction
Ensure that the ‘flow direction’ parameter for nodes in the connected network is not set to ‘bidirectional’ unless the element represents a group (e.g., baffles or valves) placed within the network. Bidirectional settings complicate flow determination and reduce regeneration efficiency.
7. Use Multiple Project Files
Maintaining an entire building services design in a single, well-connected model allows full data propagation. However, the size of the connectivity network directly affects operational efficiency. Tests show that as the network size increases, handling efficiency decreases linearly.
Because efficiency inversely relates to network size, data propagation advantages may be outweighed by the need for better model manipulation performance.
For complex, large buildings, the best practices above might not deliver optimal performance. In such cases, consider splitting the model across multiple Revit project files.
There are two main approaches to organizing MEP project files:
- By Discipline: Separate project files for each MEP discipline—mechanical, electrical, plumbing, and fire protection.
- By Building Area: Separate project files for different building areas, each covering all disciplines within its area.
To facilitate coordination between MEP domains, all domains should reside within the same Revit project file. This setup allows direct connections between domains, such as electrical connectors or plumbing connections on mechanical equipment. Testing also shows that independent connectivity networks do not significantly impact each other; for example, piping networks have minimal effect on sanitary network control within the same project.
8. Simplify Architectural Element Display
Reducing the complexity of visible architectural elements decreases the number of elements generated and maintained in views, thereby improving efficiency. Use appropriate detail level settings in views to implement this strategy.
That concludes our discussion on key considerations for Revit model optimization, using an MEP model as an example. I hope this article proves helpful to everyone!
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