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Increased demand due to corona damage! A new service has been created that creates business through systems thinking!
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STOP COVID-19 × AI, IoT, Internet of Things, RPA, OCR-AI, ERP, cloud, bigdata, blockchain, ICT, 5G, 3D, AR, VR, iCLIP, core industrial software, smart chips, smart driving, core algorithms, neutrinos, quantum Top cutting-edge Technology.Engaged in the research and development environment of cutting-edge technology and products
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AI IOT 5G
Cloud
DX:Digital Transformation
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Technology is today central to the architectural practice.
It radically refines our built environment’s design and bolsters its performance.
Throughout my projects & publications, Architecture & Technology are two interwoven disciplines.
AI&VR × ArchitectureTechnology
AI & Architecture
Towards a New Approach
The advent of Artificial Intelligence as a discipline has been permeating countless fields, bringing means and methods to previously unresolved challenges, across industries. The fusion of this new techno-science with Architecture is still in its early days but offers promising results. Our thesis proposes to evidence its potential as it is applied to Architecture. More than a mere opportunity, it is to us, shaping a promising discipline per se. Specifically, we offer to apply AI to floorplans analysis, and generation. Our ultimate goal is two-fold: offer a proper classification methodology of floorplans, able to tackle diversity and quantity, while creating a framework for machine learning-based floorplan generation.
Floorplans are indeed a high-dimensional problem, at the crossroad of quantifiable technics, and more qualitative properties. The study of architectural precedent remains too often a hazardous process, that negates the richness of the number of existing resources while lacking in analytical rigor. We offer here a methodology, inspired by current Data Science methodologies, to qualify plans, both through their style and their organization.
At the heart of this project, lies the necessity of inventing meaningful metrics to qualify and classify floorplans. Through the creation of 6 metrics, we propose a framework that captures architecturally relevant parameters of floorplans.
On one hand, Footprint Shape, Orientation, Thickness & Texture are 3 metrics capturing the essence of a given floorplan’s style. On the other hand, Program, Connectivity and Circulation will capture the essence of a given floorplan organization.
The advent of automated classification is in fact the bedrock of the machine learning practices. Our thesis offers to leverage our database of classified plans to evidence the possibility of such tools applied to floorplan generation. Our methodology follows two main intuitions (1) the creation of floorplans is a non-trivial technical challenge, that encompasses standard optimization technics. (2) The design of space is a sequential process, requiring successive design steps across different scales (urban scale, building scale, unit scale). We attempt to capture these two realities by using nested Generative Adversarial Neural Networks. The use of such models will enable us to capture more complexity across encountered floorplans, while breaking down the complexity of the tackled problems into successive steps. To each step will correspond a given model, trained for this particular task.
Overall, our thesis will evidence the possible back and forth between human and machines, that permeates the architectural discipline today. The machine that was once the extension of our pencil, can today be leveraged to map architectural knowledge, and be trained to assist us creating viable design options.
Artificial Intelligence & Architecture
An Exhibit at the Arsenal Pavilion
Artificial Intelligence (AI) has already made its way into the industry, providing it with the means to meet new challenges. Its use in the field of architecture is still in its infancy, but the expected results already obtained are promising. This technology is much more than a mere opportunity, it is without doubt a decisive step forward, quite capable of transforming the architectural practice. This exhibition explores this engagement and its application to the built environment. Defining AI, explaining what it encompasses, both as techniques and as paradigms, is central to understanding its advent in architecture.
AI first needs to be considered from the perspective of the history of science and that of architecture. Rather than a “disruption”, the technological evolution surrounding and supporting AI is the result of a slow maturation. Indeed, the profession has been undergoing a transformation for quite some time. The progressive adoption of technological solutions has already profoundly changed each stage of its value chain: first by exploiting new construction techniques, then by developing appropriate design software, and now by introducing statistical computing capacities, including, in the forefront, data science and artificial intelligence. Henceforth, rather than a radical orbit change, we want to see a change of trajectory whose acceleration is ultimately in the continuity of a practice that has led architecture to what it is today. Modularity, Computer Aided Design (CAD), Parametricism and Artificial Intelligence (AI) are the four inexorably interwoven stages of a sequence that frames the slow hybridization of our practices such as we live them and can imagine them today.
Bringing together concrete examples and recent results achieved in various fields of research, we showcase for the first time an inventory of AI’s presence in architecture and a panorama of the latest advances in this field. Facade, plan, structure, perspective : as many scales for measuring the city to which AI can already contribute, whether real or hypothetical.
Between current theory and experimentation, this exhibit intends to shed light on the inception of a new technological era, leveraging the architectural practice, while offering it a renewed relevance.
The Advent of Architectural AI
A Historical Perspective
The practice of Architecture, its methods, traditions and know-how are today at the center of passionate debates. Challenged by outsiders, arriving with new practices, and questioned from within, as practitioners doubt of its current state, Architecture is undergoing a truly profound (r)evolution.
Among the factors that will leave a lasting impact on our discipline, technology certainly is one of the main vectors at play. The inception of technological solutions at every step of the value chain has already significantly transformed Architecture. The conception of buildings has in fact already started a slow transformation: first by leveraging new construction technics, then by developing adequate softwares, and eventually today by introducing statistical computing capabilities (including Data Science & AI). Rather than a disruption, we want to see here a continuity that led Architecture through successive evolutions until today. Modularity, Computational Design, Parametricism and finally Artificial Intelligence are to us the four intricated steps of a slow-paced transition. Beyond the historical background, we posit that this evolution is the wireframe of a radical improvement in architectural conception.
KI und Architektur
Der entwerfende Computer
Wie lassen sich Computer, die früher lediglich eine Art erweiterter Zeichenstift waren, heute dazu nutzen, architektonisches Wissen abzubilden? Wie lassen sie sich mit Hilfe maschinellen Lernens trainieren, Architekt*innen bei der Entwurfsarbeit zu unterstützen?
Die hier vorgeschlagene Methode basiert auf einem dreistufigen Prozess: (I) Generierung von Grundrissen, das heißt Optimierung der Erzeugung sehr unterschiedlicher Grundrissentwürfe in großer Zahl, (II) Qualifizierung von Grundrissen, das heißt Entwicklung einer geeigneten Klassifizierungsmethode, und (III) Bereitstellung der Möglichkeit für die Nutzer*innen, die erzeugten Entwürfe zu durchsuchen.
Der Prozess zielt auf eine bessere Differenzier-, Qualifizier- und Modulierbarkeit von Ergebnissen im Vergleich zu bisherigen Programmanwendungen aus dem Feld der KI-gestützten Raumplanung.
Urban Tech On The Rise
When Machine Learning Disrupts the Real Estate Industry
with Daniel Fink & Pamella Gonçalves
The practice of urban analytic is taking off in the real estate profession. Data science and algorithmic logic are close to the forefront of new urban development practices. “How close?” is the question, but experts consider that digitization will go far beyond intelligent building management systems. New analytical tools with predictive capabilities will dramatically affect the future of urban development, reshaping the real estate industry in the process.
Metabolism(S)
Space Flexibility in The 21st Century
“Flexibility” in architecture refers to the ability of a building to continuously adapt its space layout and even its structure to evolving needs. Stemming from the Modernist movement’s dream which emerged in Japan in the 60’s, the ideal of buildings as constantly evolving entities blends together three main aspirations: the need for a more efficient built environment, an answer to urban centers densification and the humanist promise of a city that would adapt to its citizens.
Buildings are no exception to the rule of supply and demand. They quite naturally go through uneven utilization cycles with ups & downs that can be explained by a broad set of reasons: tenants’ volatility, daily traffic, business seasonality or simply competitive rivalry. But, in contrast to this cyclical nature of use, the real estate industry is stuck with rigidity: the physical rigidity of space and the contractual rigidity of leases. As a result, space is far from being used efficiently. And underperforming spaces are depleting economic value. Given this spatial inefficiency, tuning spaces on a monthly, daily – or even an hourly – basis to achieve greater efficiency seems quite legitimate. At the same time, as city centers increasingly densify, finding available space is a growing concern. Identifying under-utilized spaces and revamping them to match demand is becoming a game-changing paradigm. Finally, as the digital revolution carries the promise of a more personalized user experience, buildings might just be on the verge of following a similar trend. Through constant remodeling and reprogramming, buildings could be tailored to their users’ needs, comfort, and expectations. All in all, building flexible spaces aims to create a more relevant built environment.
However, achieving ‘’architectural flexibility’’ is a challenge that a number of investigations have tried to take up over the past century. From the early stage of the Japanese Metabolist movement to the formal flexibility of contemporary architecture, architects have progressively enshrined the principle of space plasticity. But, by and large, they have rather turned it into a style away from its initial ambition to make functional flexibility an actual operating principle. Today, however, independently of any disciplinarian consideration, the emergence of Big Data powered by algorithmic and semi-automation, may put the promise of architectural flexibility within our reach. There are three good reasons to believe it is no longer just a utopic ideal. First, data and analytics could enable the built environment to better understand and forecast space utilization. Second, semi-automation could help adapt space layouts in near-to-real time, while optimizing users’ comfort and space efficiency. And three, society's fast-moving evolution, including consumers' behavior mutation, could timely leverage the disruptive potential of technologies. On this ground, we propose a revived architectural answer: The Synaptic Building. The Synaptic Building and our manifesto, rooted in the Metabolist tradition, positioning space flexibility as the corner-stone of the 21st-century architectural practice.
Portfolio
From ETH to Harvard - 2011 - 2017
My work is based on a simple conviction: what the hand can spontaneously express, architecture must be able to reflect it. In other words, no architectural concept should escape the simplicity of hand sketching. It is to me a discipline of rigor I apply to my design process, and also a method I use to retrieve the very essence of my projects. Bringing the core concept of each scheme to its most radical form is my constant challenge. In a nutshell:
Few lines, no colors, simplicity and abstraction, to extract the essential.
The portfolio opens with Continuum, a public library for the neighborhood of Back Bay, in Boston. The building had to reconcile a public program of open access stacks, a café, and an amphitheater while ensuring enough privacy for private archives and regulated access. The edifice sits on the river, one foot in the city, one in Back Bay Park. The unicity of the program is achieved through a ring-like scheme composed of three overlapping circles, the outer ring hosting the public program and the most-inner one regrouping the archives. Each circle is made out of a sequence of frames, with varying gaps in between, inducing changing gradients of privacy: wide gaps towards the park, offering a porous façade, allowing for dense light and views for the café and the public stacks; thin openings towards the city, to shelter the private archives and working rooms, while bringing in a filtered light.
Next, is Our Lady of the Fields, a cathedral for South Boston, a project which tries to reconcile faith and ecology, as one singular experience. Following the initial intent of my sketch, the objective was to control views on the exterior, while overlapping religious artworks and natural landscape. As a result, the building, sunk in the ground, offers fourteen curated views on an outside vegetal slope. Each view is in fact framed by two concrete piers, and hosts one of the 14 paintings of the Artist Veronique Charpy, each painting representing one station of the Passion of the Christ. The adapting vegetation in the background, reinforces the sequence: from mineral landscapes for the first stations to a flourishing vegetal scenery for the last stations. The orientation of the Cathedral also ensures that the daily cycle of the sun successively enlights each station, in the proper order, thus reinforcing the symbolic meaning of the sequence.
Steps, is a public thermal bath, located in the Bodio Valley (Switzerland). The building uses a local hot spring source to harvest the heat of the water to power the building. The project offers a sequence of baths, ultimately cooling down the water before releasing it in the river, as required by the ecological policy of Bodio. The alignment of baths, from hot to cool water, progresses under one single linear roof, as the building gradually emerges from the ground. The user is invited to move back and forth along this gradient of pools to fully experience the baths: from warm to cold, from darkness to light, from interior to exterior.
The following project, entitled Refuge, is a hotel located on Stromboli Island (Italy). This volcanic archipelago welcomes an increasing traffic of tourists, hiking around the crater of the volcano. Refuge aims at hosting visitors for the night, while offering a respite to the hikers. The scheme uses a circular shape to curate a 360-degree view on the landscape, while sheltering inside a patio and its pool. The circular ring is composed of a sequence of rooms and bathrooms, interrupted by a lobby, a series of meeting rooms, and an amphitheater overlooking the volcano. As the sun sets, the pool acts as a natural mirror, reflecting the ever-erupting volcano.
Finally, Blocks vs Grid is a proposal for the master plan of South Boston. This project is an attempt to harmonize the need for homogeneity of the urban fabric, with the organic nature of city dwellings. This project plays with the tension between a unifying grid-like “wrapper” around each block, and the heterogeneity of the stacked modular building units. On the street side, the city seems organized and harmonious. Inside each block however, the serendipity of the stacking offers a vibrant environment for the communities, with rich circulations, footbridges, parks and play grounds.
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AI & Architecture
In this article, we release a part of our thesis, developed at Harvard, and submitted in May 2019. This piece is one building block of a larger body of work, investigating AI’s inception in Architecture, its historical background, and its potential for space organization & style.
Artificial Intelligence, as a discipline, has already been permeating countless fields, bringing means and methods to previously unresolved challenges, across industries. The advent of AI in Architecture, described in a previous article, is still in its early days but offers promising results. More than a mere opportunity, such potential represents for us a major step ahead, about to reshape the architectural discipline.
Our work proposes to evidence this promise when applied to the built environment. Specifically, we offer to apply AI to floor plans analysis and generation. Our ultimate goal is three-fold: (1) to generate floor plans i.e. optimize the generation of a large and highly diverse quantity of floor plan designs, (2) to qualify floor plans i.e. offer a proper classification methodology (3) to allow users to “browse” through generated design options.
Our methodology follows two main intuitions (1) the creation of building plans is a non-trivial technical challenge, although encompassing standard optimization technics, and (2) the design of space is a sequential process, requiring successive design steps across different scales (urban scale, building scale, unit scale). Then, in order to harness these two realities, we have chosen nested Generative Adversarial Neural Networks or GANs. Such models enable us to capture more complexity across encountered floor plans and to break down the complexity by tackling problems through successive steps. Each step corresponding to a given model, specifically trained for this particular task, the process can eventually evidence the possible back and forth between humans and machines.
Plans are indeed a high-dimensional problem, at the crossroad of quantifiable technics, and more qualitative properties. The study of architectural precedent remains too often a hazardous process, that negates the richness of the number of existing resources while lacking in analytical rigor. Our methodology, inspired by current Data Science methodologies, aims at qualifying floor plans. Through the creation of 6 metrics, we propose a framework that captures architecturally relevant parameters of floor plans. On one hand, Footprint Shape, Orientation, Thickness & Texture are three metrics capturing the essence of a given floor plan’s style. On the other hand, Program, Connectivity, and Circulation are meant to depict the essence of any floor plan organization.
In a nutshell, the machine, once the extension of our pencil, can today be leveraged to map architectural knowledge, and trained to assist us in creating viable design options.
I. Framework
Our work finds itself at the intersection of Architecture and Artificial Intelligence. The former is the topic, the latter the method. Both have been simplified into clear & actionable categories.
Architecture is here understood as the intersection between Style and Organization. On one hand, we consider buildings as vectors of a cultural significance, that express through their geometry, taxonomy, typology, and decoration a certain style. Baroque, Roman, Gothic, Modern, Contemporary: as many architectural styles that can be found through a careful study of floor plans. On the other hand, buildings are the product of engineering and science, answering to strict frameworks and rules -building codes, ergonomics, energetic efficiency, egress, program, etc — that can be found as we read a floor plan. This organizational imperative will complete our definition of Architecture and drive our investigation.
Framework Matrix | Source: Author
Artificial Intelligence will be employed, using two of its main fields of investigation — Analytics and Generative Adversarial Networks — as an investigative tool.
At first, we will dive into the topic of Generation. Using GANs, we offer to educate our own AI systems to architectural design. We postulate that its utilization can enhance the practice of the architectural discipline. This field is as recent as it is experimental and yields to this day surprising results. Our hope is to be able to train it to draw actual building floor plans.
Then, we will come up with a robust analytical framework to qualify and classify the generated floor plans. Ultimately, our goal is to organize the results of our GANs, to offer the possibility for the user to browse seamlessly through the variety of created design options. To that end, the quantity and ubiquity of tools offered by Data Science will prove to be valuable to our investigation.
Through this dual lens, at the crossroad of Style & Organization, Qualification & Generation, we lay down a framework that organizes the encounter of Architecture & AI.
II. Generate
The design of architectural floor plans is at the core of the architecture practice. Its mastery stands as the gold standard of the discipline. It is an exercise that practitioners have overtime relentlessly tried to improve through technology. In this first part, we dive into the potential of AI applied to floor plan generation, as a mean to push the envelope even further.
Using our framework, to tackle floor plans’ style and organization, we lay down in the following chapter the potential of AI-enabled space planning. Our objective is to offer a set of reliable and robust tools to both evidence the potential of our approach and to test our assumptions.
The challenge is here threefold: (1) choosing the right toolset, (2) isolating the right phenomena to be shown to the machine and (3) ensuring that the machine “learns” properly.
AI & Generative Adversarial Neural Networks
Generative Adversarial Neural Networks — or GANs- are here our weapon of choice. Within the field of AI, Neural Networks stands as a key field of investigation. The creative ability of such models has been recently evidenced, through the advent of Generative Adversarial Neural Networks. As any machine-learning model, GANs learn statistically significant phenomena among data presented to them. Their structure, however, represents a breakthrough: made of two key models, the Generator and the Discriminator, GANs leverage a feedback loop between both models to refine their ability to generate relevant images. The Discriminator is trained to recognize images from a set of data. Properly trained, this model is able to distinguish between a real example, taken out of the dataset, from a “fake” image, foreign to the dataset. The Generator, however, is trained to create images resembling images from the same dataset. As the Generator creates images, the Discriminator provides him with some feedback about the quality of its output. In response, the Generator adapts, to produce even more realistic images. Through this feedback loop, a GAN slowly builds up its ability to create relevant synthetic images, factoring in phenomena found among observed data.
Generative Adversarial Neural Network’s Architecture
Representation & Learning
If GANs represent a tremendous opportunity for us, knowing what to show them is crucial. We have here the opportunity to let the model learn directly from floor plan images. By formatting images, we can control the type of information that the model will learn. As an example, just showing our model the shape of a parcel and associated building footprint will yield a model able to create typical building footprints given a parcel’s shape. To ensure the quality of the outputs, we will use our own architectural “sense” to curate the content of our training sets: a model will only be as good as the data we give him, as architects.
Here below, we illustrate a typical training sequence: this sequence, realized over the course of a day and half of training, displays how one of our GAN-models progressively learns how to layout rooms and fenestration for a housing unit.
Training Sequence | Source: Author
Although the initial attempts are imprecise and confuse, after 250 iterations the machine builds for itself some form of intuition.
Precedents
If GANs’ application to architectural design is still in its infancy, a handful of precedents inspired our work and drove our intuition. Hao Zheng’s and Weixin Huang offered at the ACADIA conference in 2018 a first publication, demonstrating the potential of GAN for floorplans recognition and furniture layout generation. Using patches of color, their model would draw the infill of rooms, based on the room program, and its openings position. The same year, Nathan Peters in his thesis at the Harvard GSD, proposed to use GANs (pix2pix) to tackle program repartition in single-family modular homes, based on the house footprint.
Regarding GANs as design assistants, Hao Zheng’s (Drawing with Bots: Human-computer Collaborative Drawing Experiments, 2018) and Nono Martinez’ thesis at the GSD (2017) inspired our investigations. Both authors tackled the idea of a loop between the machine and the designer to refine the very notion of “design process”.
Our work expands on these precedents and offers to nest 3 models (footprint, program, and furnishing) to create a full “generation stack” while improving results quality at each step. By automating multi-units processing, our work then scales to entire buildings generation, and masterplan layouts. We further offer an array of models dealing with style transfer. Finally, our contribution adds a rigorous framework to parse and classify resulting outputs, enabling users to “browse” consistently through generated options.
A. Style Transfer
Modern-to-Baroque Floor Plan Translation | Source: Author
Within a floor plan, “Style” can be observed by studying the geometry and figure plane of its walls. Typical baroque churches will display bulky columns, with multiple round indents. A modern villa by Mies van der Rohe will show thin flat walls. This “crenellation” of the wall surface is a feature that a GAN can appreciate. By showing it pairs of images, with one image being a segmented version of a plan, and the other one the original wall structure, we can then build a certain amount of machine intuition with regard to architectural style.
This section shows the results of a model, trained to learn the Baroque style. We proceed then to a style transfer, where a given floor plan is manually segmented (A) and dressed back with a new wall stylistic (B).
Style Transfer Results: Apartment Units Modern-to-Baroque Style Transfer | Source: Author
B. Layout Assistant
Layout Assistant, a Step by Step Pipeline | Source: Author
In this section, we offer a multi-step pipeline, integrating all the necessary steps to draw a floor plan. Jumping across scales, it emulates the process taken by an architect and tries to encapsulate each step into one specific model, trained to perform a given operation. From the parcel to the building footprint (I), from the footprint to a room split with walls & fenestration (II), from a fenestrated floor plan to a furnished one (III): each step has been carefully engineered, trained and tested.
Generation Pipeline (Models I to III) | Source: Author
At the same time, by dividing the pipeline into discrete steps, the system allows for the user’s intervention between each model. By selecting the output of a model, and editing it, before giving it to the next model, the user stays in control of the design process. Its input shapes the decisions made by the model, therefore achieving the human-machine interaction expected.
1. Footprint
Context | Parcel (input)| Generated Footprint (output), Source: Author
The first step in our pipeline tackles the challenge of creating an appropriate building footprint for a given parcel geometry. To train this model, we used an extensive database of Boston’s building footprints and were able to create an array of models, each tailored for a specific property type: commercial, residential (house), residential (condo), industrial, etc.
Each model is able for a given parcel, to create a set of relevant footprints, resembling in dimension and style the type it was trained for. 9 examples, using the residential (house) model are shown here below.
Results: Generated Footprints (housing) | Source: Author
2. Room Split & Fenestration
Footprint | Openings & Balcony (input) | Program & Fenestration (output) | Source: Author
The layout of rooms across a building footprint is the natural next step. Being able to split a given floor plan, while respecting meaningful adjacencies, typical room dimensions and proper fenestrations is a challenging process, that GANs can tackle with surprising results.
Using a dataset of around 700+ annotated floor plans, we were able to train a broad array of models. Each is geared towards a specific room count and yields surprisingly relevant results once used on empty building footprints. We display here below some typical results. More results are also available here.
Results: Generated Program & Fenestration | Source: Author
3. Furnishing
Program (input, option 1) | Furniture Position (input, option 2)| Furnished Unit (output) | Source: Author
This last step brings the principle of generation to its most granular level: the addition of furniture across space. To that end, we trained at first a model to furnish the entire apartment all at once.
The network was able to learn, based on each room program, the relative disposition of furniture across space, and the dimensions of each element. The results are displayed here below.
More results are also available here.
Results: Furnished Units | Source: Author
If these results can give a rough idea of potential furniture layouts, the quality of the resulting drawings is still too fuzzy. To further refine the output quality, we have trained an array of additional models, for each room type (living room, bedroom, kitchen, etc…). Each model is only in charge of translating a color patch added onto the plan, into a properly drawn piece furniture. Furniture types are encoded using a color code. We display here below the results of each model.
Results of Room Furnishing Models | Bathroom / Kitchen / Livingroom / Bedroom | Source: Author
4. Going Further
If generating standard apartments can be achieved using our technic, pushing the boundaries of our models is the natural next step. GANs can, in fact, offer quite remarkable flexibility to solve seemingly highly constrained problems. In the case of floor plans layout, as the footprint changes in dimension and shape, partitioning and furnishing the space by hand can be a challenging process. Our models prove here to be quite “smart” in their ability to adapt to changing constraints, as evidenced below.
GAN-enabled Space Layout under Morphing Footprint | Source: Author
Our ability to control the units’ entrance door and windows position, coupled with the flexibility of our models allows us to tackle space planning at a larger scale, beyond the logic of a single unit. In the examples below we scale our technic to entire buildings.
Experimental GAN-generated Masterplans | Source: Author
III. Qualify
“Failing to name things adds to the World’s disarray” Albert Camus
To balance out our ability to generate floor plans, finding the proper framework to organize, sort & classify the wealth of generated design options is more than crucial. The floor plans we offer will only be as good as our ability to navigate across our database of generated options. By borrowing concepts from Architecture, we hope to transform common architectural adjectives into quantifiable metrics.
To that end, we have isolated 6 key metrics, describing 6 essential aspects of floor plan design: Footprint, Program, Orientation, Thickness & Texture, Connectivity and Circulation.
6 Metrics | Source: Author
These metrics work together as a comprehensive framework, addressing both the stylistic and organizational dimensions of floor plans. Each one has been developed as an algorithm, and thoroughly tested.
A. Footprint
The shape of a building is the simplest and most intuitive proxy to qualify its style. The “Footprint” metric analyzes the shape of the floor plan perimeter and translates it into a histogram.
This descriptor, while encoding the shape of a building, can translate common adjectives — “thin”, “bulky”, “symmetrical”, etc — used by architects into numerical information, in order to communicate with a computer about building shapes.
Footprint Polar Diagram | Source: Author
From a technical standpoint, this metric uses polar convexity to turn a given outline into a list of discrete values (vector) that can then be compared to other floor plans. We use a polar array of lines, stemming from the center of the plan, to extract the area of the plan captured by each slice of space obtained. This methodology has proven to yield satisfactory results, as shown in the queries here below. This technic can also be employed to qualify indoor spaces’ shape as well as building perimeter’s geometry.
Typical Floor Plans Retrieval using the Footprint Metric (left: query, right: results) | Source: Author
B. Program
The Program of a building, or in other words, the type of rooms it contains, is a major driver of its internal organization. Capturing this reality is central to our approach. To describe the “mix” of rooms we represent through a color code the list of rooms contained in any given floor plan. This colored band becomes the proxy, to describe the program. It acts as a template, aggregating both the quantity and the programmatic quality of the rooms within the floor plan. It is an intuitive visual description for humans which can translate into a reliable encoding technic for machines.
Typical Floor Plans Retrieval using the Program Metric (left query, right results) | Source: Author
From a technical standpoint, by using this colored band, we can compute the programmatic similarities and dissimilarities between any given pair of floor plans. To visualize results, each plan is reported as both a colored floor plan and a one-dimensional color vector of its program.
Typical Floor Plans Retrieval using the Program Metric (left: query, right: results, bottom: results’ program) | Source: Author
C. Orientation
The Orientation of walls in a plan is a valuable source of information. It can describe both the enclosure (how secluded spaces are due to the presence of walls) and the style of a plan. In fact, using this metric, we can easily differentiate a modern house-pavilion from a gothic cathedral, simply by extracting the histogram of the walls’ orientation.
Orientation Diagrams | Source: Author
From a technical standpoint, orientation extracts the walls of a given floor plan and sums their length along each direction of space, from 0 the 360 degrees. The resulting list of values is an assessment of the overall orientation of the plan. It can be averaged to get a single descriptor or used as a vector to compare across plans.
Typical Floor Plans Analysis using the Orientation Metric (left: plan, right: orientation diagram) | Source: Author
D. Thickness & Texture
The Thickness & Texture metric qualifies the “fat” of a plan: its wall thickness and the variation of this thickness. The Thickness of walls across a plan, as well as the geometry of the wall surface — Texture — can vary drastically from one style to another. A Beaux-Arts hall would display columns and indented thick walls when a villa from Mies van der Rohe would display thin rectilinear walls, which our metric would grasp easily (see image here below).
Thickness & Texture Diagrams | Source: Author
From a technical standpoint, this metric isolates all the walls of a given plan and outputs a histogram of wall thicknesses. At the same time, the algorithm computes the variation of the thickness, to better describe the wall texture (ie. flat walls versus mullions).
Typical Floor Plans Analysis using the Thickness & Texture Metric (left: plan, right: resulting diagrams) | Source: Author
E. Connectivity
The Connectivity metric tackles the question of room adjacencies. The proximity of rooms to one another is a key dimension of a floor plan. Moreover, their connection through doors and corridors defines the existence of connections between them. Connectivity investigates the quantity and quality of such connections, by treating them as a standard graph.
Connectivity Diagram & Adjacency Matrix | Source: Author
From a technical standpoint, by using the fenestration from a plan, we can deduce the graph of existing relationships among rooms. The Connectivity metric then builds an adjacency matrix, reporting these connections. A graph representation is finally generated. Using this graph, we can compare floor plans, taking into account the similarity of connections among rooms.
Typical Floor Plans Analysis using the Connectivity Metric (left: connectivity graph, right: plan adjacencies) | Source: Author
F. Circulation
The Circulation in floor plans captures how people move across it. By extracting a skeleton of the circulation, or in other words, a wireframe of the circulatory network, we can both quantify and qualify people’s movement across a floor plan.
Circulation Diagram | Source: Author
From a technical standpoint, Circulation extracts the skeleton of circulations of a given floor plan and sums its length along each direction of space, from 0 the 360 degrees. The resulting histogram is an assessment of the circulatory network geometry and can be used to be compared against other floor plans’ circulation.
Typical Floor Plans Analysis using the Circulation Metric (left: circulation graph, right: diagram) | Source: Author
IV. Mapping & Browsing
Similarity graphs, Comparing One Plan to Many | Source: Author
Looking back at our GAN-models, each one actually outputs multiple options at each step of our generation pipeline. The designer is then invited to “pick” a preferred option, modify it if needed, before actioning the next step. Browsing through the generated options however can be frustrating, and time-consuming. To that end, the set of metrics defined in the “Qualify” chapter can demonstrate their full potential here and complement our generation pipeline. By using them as filters, the user can narrow down the range of options and find in a matter of seconds the relevant option for its design. This duality of Generation-Filtering is where the value of our work gets all the more evidenced: we provide here a complete framework, leveraging AI while staying within reach of a standard user.
Once filtered according to a given criterion (Footprint, Program, Orientation, Thickness & Texture, Connectivity or Circulation), we provide the user with a tree-like representation of her/his choice. At the center is a selected option, and around it, its nearest neighbors classified according to a user-selected criterion. The user can then narrow down the search and find its ideal design option, or select another option within the tree, to recompute the graph.
(Each tree shown here below is accessible online at the following links: Footprint, Program, Connectivity)
Floor Plans Similarity Trees | Source: Author
V. Conclusion
AI will soon massively empower architects in their day to day practice. As such potential is about to be demonstrated, our work participates to the proof of concept while our framework offers a springboard for discussion, inviting architects to start engaging with AI, and data scientists to consider Architecture as a field of investigation. However, today, our manifesto could be summarized in four major points.
Conceptually first, our belief is that a statistical approach to design conception shapes AI’s potential for Architecture. Its less-deterministic and more-holistic character is undoubtedly a chance for our field. Rather than using machines to optimize a set of variables, relying on them to extract significant qualities and mimicking them all along the design process is a paradigm shift.
Second, we are directionally convinced that our ability to design the right pipeline will condition AI’s success as a new architectural toolset. Our choice for the “Grey Boxing” approach, as introduced by Prof. Andrew Witt in Log, will likely secure the best potential results. This method contrasts with the “black box” approach, that only allows users to input information upfront, and to get finished design options at the end of the process, without any control over the successive generation steps. To the contrary, by breaking out our pipeline into discrete steps, “Grey Boxing” permits the user to intervene all along the way. His tight control over the machine is his ultimate guarantee of the design process quality.
Third, we technically believe that the sequential nature of the application will facilitate its manageability and foster its development. The ability to intervene throughout the generating process is a fundamental dimension: as each step of the pipeline represents a distinct portion of architectural expertise, each model can be trained independently, opening the way to significant improvements and experimentation in the near future. Indeed, improving this entire pipeline end-to-end could be a long and cumbersome task, while amending it step by step remains a manageable process, within the reach of most architects and engineers in the industry.
Finally, we hope our framework will help address the endless breadth and complexity of the models to be trained and those used in any generation pipeline. Tackling parcels-footprint-room split-etc., as we do is one possible approach among, we believe, a large set of options. To encapsulate the necessary steps of space planning, the key is more the principle than the method. And with the growing availability of architectural data, we encourage further work and open-minded experimentation.
Far from thinking about AI as the new dogma in Architecture, we conceive this field as a new challenge, full of potential, and promises. We see here the possibility for rich results, that will complement our practice and address some blind spots of our discipline.
Digital Resources
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