Architectural Models and BIM: A Comprehensive Guide to Types and Applications

Architectural models, always essential for architects, engineers, and designers, have evolved with BIM (Building Information Modeling) into intelligent and collaborative tools capable of managing every phase of a building’s lifecycle. They not only allow for visualizing projects and evaluating construction solutions but, thanks to the integration of technical and economic data, support more informed decisions and reduce risks and costs.

In this guide, we will explore in detail the world of architectural models: from their traditional applications to the more advanced ones enabled by BIM, we will analyze the different types, discover the most commonly used materials, delve into the construction techniques, and illustrate their applications in various fields of design.

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Architectural Models: The Bridge Between Creativity and Concrete Design

Architectural models represent the meeting point between creativity, technical design, and visual representation. They are indispensable design tools, used to translate abstract concepts into tangible forms and to allow designers, clients, and stakeholders to interact with the project in a concrete way. They do not merely provide simple three-dimensional visualizations but constitute real means to explore, analyze, and refine every detail of an architectural work.

These models offer a fundamental advantage: they allow you to simulate reality and anticipate potential issues. Through architectural modeling, it is possible to explore alternative design solutions, verify the coherence of spaces, study interactions with the surrounding context, and even simulate the environmental impact of a building. Architectural models can, for example, help identify potential proportion problems between the various parts of a building, optimize the distribution of natural light within spaces, or analyze the accessibility of areas.

In residential design, architectural models can be used to verify the organization of rooms and the efficiency of internal circulation, aiming to identify potential improvements and ensure maximum living comfort. In more complex contexts, such as planning an entire neighborhood or creating a university campus, architectural models take on an even more strategic role. They allow for evaluating the interaction between the different elements of the project and their integration into the urban context. An architectural model can be used, for example, to optimize the arrangement of buildings, improve the usability of green areas, and ensure adequate integration between public and private spaces.

The versatility of these tools is reflected in their numerous applications: from presenting a preliminary idea to spatial analysis, up to detailed construction planning.

Types of Architectural Models

Architectural models can be classified into two main categories: physical models and digital models. While having similar purposes, they differ in materials, construction techniques, and modes of use, adapting to various design needs and development phases.

Physical models are tangible three-dimensional representations of an architectural project, made with concrete materials such as cardboard, wood, plastic, or resins. They allow for exploring volumes, shapes, proportions, and spatial relationships in a direct and immediate way. They are used both in the preliminary phases to conceive and refine design solutions and in the advanced phases to effectively present the project to clients and stakeholders.

Digital models represent architectural projects in virtual form and are created using specialized software. These models offer extraordinary flexibility and can integrate levels of detail and information that go beyond simple geometric representation. Digital models are divided into the following types:

• 3D geometric models: created with three-dimensional modeling software, these models graphically represent the shapes and volumes of the building without including additional details such as materials or technical data. They are ideal for exploring preliminary ideas and for communicating aesthetic concepts clearly and directly;
• BIM (Building Information Modeling) models: BIM models represent a significant evolution compared to simple geometric models as they integrate a wide range of technical and functional information. In addition to the geometric representation of the project, these models include data related to materials, costs, sustainability, and maintenance. The BIM model of a building can provide, for example, details about the type of glass used in windows, structural characteristics, and systems, promoting collaborative and multidisciplinary design;
• Interactive models with virtual or augmented reality: these models, often derived from BIM models, use advanced technologies such as virtual reality (VR) and augmented reality (AR) to create immersive and interactive experiences. They allow users to “enter” virtually into the designed spaces, exploring environments and configurations in real-time. For example, a client can use a VR headset to virtually walk through a building and evaluate different design solutions before construction;
• Digital twin: this technology represents the most advanced level of digital modeling. A Digital Twin does not merely replicate a building digitally but connects it to IoT devices and smart sensors to enable real-time performance monitoring. These tools provide data on energy consumption, predictive maintenance, and environmental conditions, contributing to making building management more sustainable and intelligent.

Types of architectural models

Materials and resources for creating architectural models: between physical and digital

The choice of materials used in the creation of architectural models depends on the type of model (physical or digital) and its purpose, taking into account design, functional, and aesthetic requirements. Physical and digital models, in fact, have different characteristics that determine the use of specific materials and tools for each type.

Physical architectural models are made with materials that vary based on the design phase and the level of detail required. In the initial phases, cardboard and paper are preferred for their lightness and versatility; in advanced phases, wood and plywood are used, known for their sturdiness and natural aesthetics. Rigid foam (foamboard and polystyrene) is ideal for volumetric models due to its ease of processing, while plastic and plexiglass are used for high-quality models, simulating materials like glass. Finally, metals and resins add solidity, precision, and realistic details, making them suitable for structural elements and decorative finishes.

Digital models, unlike physical ones, do not require tangible materials but leverage virtual resources and databases to create extremely detailed and interactive three-dimensional representations. The main resources used for their creation include:

• three-dimensional elements: these are fundamental geometric objects, such as cubes, rectangular prisms, spheres, and cones, used in 3D CAD modeling to build the basic structure of a digital model. These objects can be combined, resized, and manipulated to accurately represent the geometries of buildings or other structures. They are essential for defining the shape and volume of each component, such as walls, columns, foundations, and roofs;
• parametric objects: parametric objects, such as columns, floors, windows, doors, and walls, are designed to be easily modifiable through specific parameters. Each object has definable properties, such as dimensions, materials, and position, which can be dynamically modified. For example, by changing the height or width of a wall, all connected elements, such as doors or windows, automatically update. This type of object allows for quick modifications and maintains consistency and accuracy throughout the entire design process, facilitating changes to the project without having to manually update each individual component;
• textures: textures are two-dimensional applications mapped onto the surfaces of 3D objects to reproduce the appearance of real physical materials, such as wood, concrete, stone, glass, metal, and more. Textures can be used not only to simulate the surface appearance of a material but also to add effects such as scratches, imperfections, and color variations, which give a level of realism to the digital model. Additionally, textures help visualize how the building will integrate into the surrounding environment, with plays of light and shadow that reflect the reality of the material;
• libraries: BIM object libraries contain a wide range of ready-to-use objects, ranging from structural components, such as beams and columns, to finishing elements, such as furniture and systems. Using libraries saves time and achieves a high level of detail, thanks to the ability to integrate pre-modeled objects into the project that help maintain consistency and standardization among design elements;
• data and metadata: digital models are not limited to visual representation but also integrate metadata, which are additional information that describe the technical and functional characteristics of the objects. This data can relate to material properties, dimensions, cost, durability, maintenance, and sustainability. The integration of this metadata allows for more efficient resource management, promoting more informed decisions and improving the project’s lifecycle.

Techniques and tools for creating models

The process of creating architectural models involves the use of specific techniques and tools, which vary significantly based on the type of model (physical or digital).

The main techniques for creating physical architectural models are:

• manual processing: uses tools such as cutters and saws to cut and assemble materials like cardboard, wood, and plastic, ensuring creative freedom but requiring time and skill;
• CNC machines (Computer Numerical Control): offer high precision and speed, cutting and shaping materials from digital files, ideal for complex models and reducing errors;
• 3D printing: builds objects layer by layer from digital models, creating detailed prototypes in plastic, resin, or metal, useful for functional and aesthetic testing;
• laser cutting: uses a laser beam to cut and engrave materials with millimeter precision, suitable for fine details and presentation models.

Digital models are three-dimensional representations created with the help of specialized software. The main techniques for creating digital models are as follows:

• three-dimensional modeling: involves creating a 3D model that represents the geometric appearance of a building or architectural object. This technique generally involves the use of CAD software that relies on the use of fundamental geometric solids, such as cubes, rectangular prisms, spheres, and cylinders, to construct the overall shape of the model. These software allow for precise definition of the dimensions and proportions of volumes and spaces and for exploring different design configurations. Three-dimensional modeling focuses exclusively on geometry and does not integrate additional information such as materials or structural characteristics;
• BIM modeling: represents a more advanced approach, where intelligent objects are used to represent real construction elements, such as columns, floors, walls, and windows. These objects are associated with a set of detailed information, including data on materials, energy performance, structural and system characteristics, construction phases, etc. BIM software therefore do not limit themselves to geometry but provide a complete model that integrates complex information, facilitating collaboration among the professionals involved and improving project management throughout its lifecycle;
• parametric modeling: allows designers to create 3D models by setting parameters and rules that define the geometry of the object. In parametric modeling, the shape is not static but is controlled by numerical variables and constraints. By modifying these parameters, it is possible to automatically generate an almost unlimited number of variants of the same model, quickly adapting its dimensions, shape, and characteristics. This process allows designers to efficiently explore different design solutions, optimizing the design according to specific needs;
• point cloud modeling: is a technique that uses data collected from 3D laser scanners or photogrammetry to create three-dimensional models of real objects or environments. The data, consisting of millions of spatial points that represent the surface geometry, are processed with specialized software to generate detailed digital models. This technique is ideal for documenting and reconstructing existing buildings, creating accurate models for restoration or renovation projects.

Unlocking the power of IFC in BIM: how IfcArchitectureDomain shapes architectural models

BIM (Building Information Modeling) represents today the most widespread and efficient methodology for the design and management of digital models in the construction and architectural industry. The peculiarity of this technology lies in its ability to integrate geometric data and informational data, promoting interoperability among the various actors and software involved in the design process of a project. This interoperability is ensured by the IFC (Industry Foundation Classes) standard, developed by buildingSMART, which represents an open format for data exchange between BIM applications.

The IFC specifically constitutes a structured and standardized format for the digital representation of information related to buildings and infrastructures. Based on the EXPRESS language, it allows for the modeling and exchange of information on elements such as walls, doors, systems, and even entire buildings. Thanks to its open nature and backward compatibility, IFC is widely used to ensure interoperability between different software and allow professionals to collaborate using common and shared data. However, not everything is organized in a single “container.” IFCs are indeed divided into schemas that deal with specific areas, such as structures, systems, and, in this case, architecture.

The IfcArchitectureDomain is a specific schema of the IFC standard that defines specific concepts related to objects in the architectural domain, limiting itself to elements not yet generalized or included in broader and shared schemas (such as IfcProductExtension or IfcSharedBldgElements), which are then declared in lower-level schemas. Essentially, it deals with particular aspects of architecture that do not find space in the general schemas used by other domains.

The schema provides details on specific characteristics of elements such as doors and windows, expanding the parametric description of these components. Among the main aspects defined by the IfcArchitectureDomain are:

• covering and door panel parameters, which allow for a limited parametric description of the shape and operation of the door;
• covering and window panel parameters, which allow for a limited parametric description of the shape and operation of the window;
• specific properties of permeable covering for window and door openings.

This information is associated with the types of doors (IfcDoorType) and windows (IfcWindowType) through a relationship called HasPropertySets, which allows linking specific properties to each element.

Thanks to the IfcArchitectureDomain, BIM models are not limited to geometric representations but become true containers of useful information for every phase of the project. This level of detail allows architects to optimize workflows, ensure consistency, and simplify coordination with engineers and system designers.

Applications of BIM architectural models

Architectural models created with the BIM (Building Information Modeling) methodology are fundamental tools for every phase of a project’s lifecycle, with applications that include:

• conceptual design: BIM models add value to this phase thanks to the ability to integrate parametric data and preliminary simulations, making the evaluation of design variants and contextual constraints more immediate. The ability to manipulate models before actual construction allows for refining design solutions and making more informed decisions;
• communication and presentation: facilitate understanding of the project through interactive 3D digital models, virtual walkthroughs, and augmented reality (AR/VR), making presentations interactive and improving the decision-making process;

BIM virtual reality communication | usBIM.geotwin

• technical analysis: thanks to integrated data, BIM allows for precise calculation of energy consumption, predicting structural behavior under different environmental conditions, and simulating sustainable design scenarios;

BIM Energy Analysis | usBIM.geotwin

• maintenance and management: once the building is completed, architectural models continue to be useful in the maintenance and management phase of the property. BIM models, with their data-driven approach, act as a digital twin of the building, collecting up-to-date information on materials, systems, and installations. This allows for real-time monitoring and management of maintenance operations, planning renovation interventions, and optimizing the energy efficiency of the buildings. Watch usBIM.facility in action and discover how to manage assets and maintenance plans in an integrated way with the BIM model of the work:

Architectural models of the future: BIM, automation, and sustainability

With the evolution of technology, architectural models are set to transform into increasingly powerful, intelligent, and interactive tools. Technological innovation promises to expand their functionalities and redefine the role they play in the design process and building management. Here are some insights into what we can expect for the future:

• advanced technologies: artificial intelligence and machine learning will allow for the creation of models that automatically adapt to design constraints and learn from past projects, optimizing accuracy and efficiency;
• automation and generative design: advanced algorithms will automatically generate innovative solutions based on criteria such as sustainability, energy efficiency, and functionality;
• cloud collaboration: cloud BIM management platforms will facilitate the simultaneous sharing of projects among international teams, improving efficiency and reducing errors;
• environmental sustainability: advanced simulations will optimize materials and resources, contributing to the design of low environmental impact buildings;
• user engagement: immersive experiences and interactive interfaces will allow clients to explore and customize projects, enhancing decision-making and reducing revisions.

The future of architecture is already here and moving quickly. To avoid being caught unprepared, you can optimize the process of creating your architectural models with a 3D BIM design software. With the help of this powerful tool, you can create detailed models, manage all phases of the project, and collaborate in real-time with your team. Try it for free for 30 days and become a part of this transformation. Don’t miss the opportunity to evolve alongside technology!