How to Use 3D in Cultural Property Conservation and Restoration: A 5-Step Implementation Guide

In the field of cultural property conservation and restoration, it is always important to keep records, accurately understand the current condition, and align the understanding of stakeholders. However, in practice there are many pieces of information that are difficult to handle with only two-dimensional materials such as drawings and photographs: shapes that are hard to convey in 2D, subtle distortions due to aging, positional relationships you want to compare before and after disassembly, and so on. This is where the use of 3D is attracting attention.

When people hear “3D,” they may think it requires special equipment and advanced expertise, making it difficult to introduce to conservation sites. In reality, however, if you clarify the purpose and incorporate it in a manageable way according to the workflow, 3D becomes an effective method to improve the quality and efficiency of cultural property conservation and restoration. The important thing is not to start on a large scale from the outset, but to organize when and for what purposes you will use 3D, and operate it in a way that fits the site.

Especially in cultural property conservation and restoration, merely creating a visual 3D model is insufficient. You must consider which point in time you will record, what accuracy is required, what extent to measure, and who will use the acquired data and how—otherwise even carefully created 3D models will not be fully usable in practice. Conversely, if you can organize these aspects, 3D can be powerful in many situations such as preliminary surveys, construction planning, repair records, comparative verification, and maintenance management.

This article explains, for practitioners responsible for cultural property conservation and restoration, the significance of introducing 3D, the things to organize before introduction, and the actual implementation steps in five easy-to-follow steps. To help sites that are introducing 3D for the first time get started, we will carefully organize not only the conceptual approach but also practical points tailored to conservation and restoration work.

Table of Contents

• Why 3D is needed in cultural property conservation and restoration

• Basic items to organize before introducing 3D

• Step 1 Clarify the purpose and deliverables

• Step 2 Investigate the object and site conditions

• Step 3 Plan how to acquire 3D data

• Step 4 Organize acquired data and make it usable

• Step 5 Integrate into the conservation and restoration workflow and operate

• Points to avoid failure when introducing 3D in conservation and restoration

• Conclusion

Why 3D is needed in cultural property conservation and restoration

The main reason 3D is needed in cultural property conservation and restoration is that it allows the object’s condition to be preserved as objectively and as reusably as possible. Each cultural property has a different condition, and even components that look similar can contain details relevant to repair policy—dimensional variations, slight deformations, surface wear, tilt or settlement. Photographs are excellent for visual records, but they are limited when you need to rigorously confirm distances, heights, continuity of curved surfaces, or positional relationships between components afterward. 3D data can retain such information as three-dimensional coordinate information, making it strong for later-stage confirmation and comparison.

In addition, conservation and restoration often require preserving a temporary state of the site. The overall shape before disassembly, the fit during disassembly, traces visible only after removing components, and the extent of damage before repair—these moments cannot be re-recorded once missed. Traditionally, records were made by combining photos, sketches, manual measurements, and drawings, but these are often influenced by the experience of the person in charge and the available work time. Combining 3D reduces differences between operators and makes it easier to leave records that can be analyzed from multiple perspectives later.

Moreover, 3D is effective for aligning understanding among stakeholders. Cultural property conservation and restoration often involves investigators, designers, constructors, supervisors, owners, and administrative officials. Shapes and fits that are hard to convey with plan and section drawings can be easier to understand visually in 3D. Complex roof shapes, inclined surfaces, curved surfaces, and overlapping component assemblies are particularly easier to explain with 3D, reducing the number of review cycles.

The value of 3D in conservation and restoration is not simply to create an attractive model. Its value lies in increasing the evidence base for repair decisions, enhancing the reproducibility of records, and leaving an information foundation that supports future maintenance. For example, when re-survey or additional repair is needed years later, past 3D data makes it easier to grasp the amount of change and to consider which parts have been progressively deteriorating. In disaster recovery or preventative maintenance, having a baseline three-dimensional record is also highly meaningful.

On the other hand, 3D is not万能 (all-powerful). High-precision measurement alone does not automatically lead to appropriate repair policy; it becomes meaningful only when combined with interpretation of materials, construction methods, traces, history, and cultural value. Therefore, in using 3D for cultural property conservation and restoration, it is important not to make recording technology the goal in itself. Position 3D as a means to improve repair quality, avoid unnecessarily complex operations, and shape it into a form that is genuinely useful on site.

Basic items to organize before introducing 3D

To successfully introduce 3D, it is important to sort out the basics before choosing equipment or software. Failures on conservation sites often occur when measurements are started with unclear required accuracy or usage, resulting in data that is difficult to use later. Even if an impressive-looking 3D model is created, if it lacks information essential for evaluation or is too heavy to share, it will not be utilized in practice.

First, organize the intended use of the 3D data. Whether it’s for current condition records, repair design support, monitoring changes, verification of as-built conditions, or use as a future maintenance ledger, the required extent and accuracy will differ. For example, the data needed to understand the tilt of an entire building and surrounding topography differs greatly from the data needed to inspect fine surface shapes of a sculpture. If this is left ambiguous, you may end up measuring excessively and increasing time and burden, or conversely, face missing information and need to remeasure.

Next, decide the form of the deliverables. Determine in advance whether keeping a point cloud is sufficient, whether a dimension-checkable model is needed, whether drawings should be generated, or whether explanatory visual materials are required. In conservation and restoration, what matters more than the 3D data itself is what you output from it and how you use those outputs. The ease of converting into the formats stakeholders regularly use directly affects operational ease.

Also, organize the characteristics of the object. Whether it is a large structure, interior decoration, stonework, or relatively small targets like statues or crafts, the appropriate acquisition method differs. Surface reflection, dark conditions, availability of scaffolding, narrow passages, feasibility of high-location work, and considerations for visitors and the surrounding environment all strongly influence the site. Cultural properties differ from general construction sites; there are often parts that must not be touched, places with limited working hours, and harsh environmental conditions, so standard measurement plans cannot be applied as-is.

Furthermore, establish a data management approach from the outset. If it’s unclear what point in time the data represents, what range it covers, who has approved it, where it is stored, and how it will be referenced in the future, the 3D data you obtained may be buried. Records of cultural properties have long-term value, so you need a perspective that avoids treating them as short-lived project files. File naming conventions, coordinate reference standards, and how to record update histories—these seemingly mundane details matter later.

In this way, preparation before measurement determines success. To root 3D in conservation and restoration sites, it is more important to organize in practical terms what to preserve, how to use it, and how to hand it over than to pursue the newest technology. Following the implementation steps after that, 3D can function not just as a tool for a few specialists but as a standard supporting tool in conservation and restoration.

Step 1 Clarify the purpose and deliverables

The first step is to clarify the purpose for using 3D and the final deliverables required. If this is ambiguous, the subsequent measurement method, work scope, processing steps, and sharing approach will all be inconsistent. In cultural property conservation and restoration, stakeholders often have different expectations of 3D, so verbalizing and sharing the purpose at the outset is particularly important.

For example, an investigator may prioritize detecting damage and measuring dimensions, a constructor may focus on before-and-after comparisons and fit checks, and a manager may emphasize long-term record preservation and explanatory materials. Trying to satisfy all these needs with a single dataset tends to become overly complex. Therefore, first set a primary purpose, and then organize secondary uses. Once the primary purpose is clear, it becomes easier to determine the required accuracy, how detailed the acquisition should be, and the appropriate delivery format.

At this stage, it helps to reframe the goals into questions commonly used on site. For instance: Do you want to be able to check the pre-repair shape later? Do you need to quantify component displacement or tilt? Do you want to examine assembly relationships including hidden parts? Do you want to make time-series comparisons as construction records? Answers to such questions clarify the required data quality.

For deliverables, don’t just think of “a set of 3D data”; break them down into practical units. Define output types by use: lightweight data for overall understanding, high-density data for detailed analysis, sectional references for drawing creation, and image outputs for explanations. Doing so improves usability for each stakeholder. Since not everyone on a conservation site necessarily uses the same software, avoid producing data that only some people can view.

It is also important to set realistic accuracy requirements. While higher accuracy seems preferable, unnecessary precision increases acquisition and processing burdens, straining budgets and schedules. For example, if the goal is overall shape understanding, there is no need to chase minute surface irregularities. Conversely, coarse data is meaningless when examining joinery, fittings, or the positional relationship of traces. Setting accuracy according to purpose is the starting point for practical 3D adoption.

Above all, avoid measurement for its own sake. By defining the purpose and deliverables at the start, subsequent steps become clear and lead to an introduction plan that is genuinely useful on site.

Step 2 Investigate the object and site conditions

The next step is to investigate the characteristics of the cultural property to be digitized and the site conditions. It is important here to carefully confirm not just the object’s shape and scale, but also the factors that constrain measurement work. Conditions at conservation and restoration sites vary more than at typical measurement sites, and the quality of on-site checks directly impacts work stability.

First confirm the object’s size, composition, material, and surface condition. The acquisition strategy differs depending on whether you need an overall grasp of a building, a component-level view, or detailed decorative surface geometry. Materials such as wood, stone, lacquer, metal, and earthen walls reflect and cast shadows differently, making some parts easier or harder to capture. Cultural properties are not homogeneous industrial products, so even within the same building, conditions can vary by location.

Next, check work flow and visibility. Where can you approach the object? Is scaffolding available? Will you only look upward at an upper part, or can you walk around it? Are there safe places to set up equipment? These factors are important to prevent omissions. During conservation work, visibility may be obstructed by stored materials, temporary structures, protective coverings, or access restrictions. Overlooking these can leave many blind spots in the data, risking the exclusion of crucial parts.

As a cultural-property-specific consideration, confirm whether physical contact is permitted and if there are restrictions on work hours. It is common that touching is prohibited, strong light must be avoided, work can only be done when visitors are absent, or humidity and temperature conditions must be respected. Even for recording, minimizing impact on the cultural property is a basic premise. Therefore, arrangements must meet preservation safety as well as work efficiency.

Also, understand the surrounding environment. Outdoors, weather, sunlight, wind, and footing stability matter; indoors, lighting conditions, confined spaces, and availability of power are factors. Cultural heritage structures often include dark areas and high locations, making acquisition conditions more demanding than anticipated. Choosing methods without considering these site conditions can result in plans that are theoretically sound but impractical on site.

In this step, observe the object, extract constraints on work, and estimate what can be reliably acquired. Successful 3D adoption sites perform thorough pre-measurement on-site checks. Skipping this leads to more corrections and rework later, increasing labor and burden. Correctly understanding the object and site conditions forms the foundation for suitable 3D adoption in conservation and restoration.

Step 3 Plan how to acquire 3D data

Once you understand the object and site conditions, plan how to acquire 3D data. In this step you concretize what extent, in what order, and at what density to capture. In conservation and restoration, it is often more successful to prioritize ensuring the capture of important areas rather than attempting to capture everything perfectly in a single session.

First consider the priority of acquisition areas. Whether you want a broad understanding of the entire cultural property, focus on areas where deterioration is concentrated, or deeply capture only the repair target, will change how you allocate work time. Often both overall and detailed records are required, but you do not need to handle the entire area at the same density. It is effective to separate roles—low-density data for overall understanding, high-density data for key areas requiring analysis.

Next design the acquisition sequence. Since scaffolding changes, weather, and work restrictions can occur on site, start with areas that would be easy to miss if delayed. For example, capture the state before disassembly, places where access is temporarily permitted, and parts that are hard to see except during daytime. Because record acquisition and construction progress are tightly linked in conservation projects, coordinate with the construction schedule.

It is important here to establish clear references. If you plan to do later comparisons or alignments, decide in advance what to use as the reference and which point-in-time state will serve as the baseline. Whether you relate to a global coordinate system or use local relative relationships affects the acquisition plan. Conservation and restoration often require time-series comparisons and cross-referencing with other materials, so set references with future use in mind.

Also determine on-site verification methods. It is not uncommon to find gaps or insufficient overlap on later review even when you thought acquisition was complete. Setting a minimum list of checks immediately after work reduces the risk of rework. For example, confirm whether major surfaces are all captured, whether important deterioration areas are present, and whether reference positional relationships are readable.

When planning 3D acquisition for conservation and restoration, focus less on technical ideals and more on identifying the information that must be reliably preserved. Plan so that under limited time and conditions you secure the information needed for later stages. With this mindset, 3D becomes a practical tool that supports reliable records rather than increasing site burden.

Step 4 Organize acquired data and make it usable

A commonly overlooked aspect of 3D introduction is the post-acquisition organization process. It is easy to feel the job is done once data has been captured on site, but in cultural property conservation the truly important task is to make that data usable later. Unorganized 3D data tends to cause problems: it cannot be found when needed, it is too heavy to open, it is unclear which point in time it represents, and it cannot be linked to other materials.

First, define the unit for organizing data. Make it immediately clear which project, which object, which time, and what range the data relates to. Conservation projects can span multiple years and generate records for the same object at different times such as pre-repair, during disassembly, and post-repair. Confusing these records causes major problems during comparative review. Standardizing file structure and naming rules is unglamorous but extremely important.

Next, consider lightweight outputs and splitting by use. 3D data is information-rich and tends to be heavy; not everyone will have the environment to handle full-scale files. Provide lightweight viewer-friendly data for overall checks, high-density data for detailed analysis, and snapshots or extracts for attaching to reports. Since not only 3D specialists will use these materials, tailor outputs to users.

Also organize correspondences with drawings, photographs, and reports. If 3D is treated as a standalone solution, cross-referencing with existing records becomes difficult. Clarify which parts correspond to which drawings or photos and which described damages relate to which features. 3D should be positioned to reinforce and facilitate cross-reference with existing materials rather than replace them.

Quality checks are also essential. Verify that necessary areas were acquired, that there are no obvious gaps or distortions, that coordinate orientation is consistent, and that the data is suitable for comparison. Problems not noticed during acquisition can often be found at this stage; identifying them early makes supplementary measures easier. Since you often cannot re-capture conservation records later, the organization stage is not mere paperwork but a crucial step in ensuring record quality.

3D data becomes a business asset only after careful organization. To make 3D useful in conservation and restoration, prioritize converting it into a form anyone can use rather than the sparkle of acquisition. With a well-designed organization process, 3D becomes an enduring, reliable record for future reference rather than a one-off deliverable.

Step 5 Integrate into the conservation and restoration workflow and operate

The final step is to actually integrate the organized 3D data into the conservation and restoration workflow and operate it continuously. Even if you carry out the previous steps carefully, 3D will not become established on site if it ends up as just a deliverable. The key is to clarify who will view what, when, and for what purpose, and to create a state where it is naturally used within the practical workflow.

The earliest effective use is in preliminary review. When considering repair policy, being able to grasp the overall shape and the fit of parts three-dimensionally helps you notice points easily missed on drawings alone. It aids consideration of the positional relationship of deterioration, interference with surrounding components, scaffolding, and work procedures. For complex cultural properties, using 3D as a common reference material improves mutual understanding in meetings.

Next, use 3D as a record during construction. Because the object’s condition changes during conservation work, recording at milestones with 3D makes it easier to track the process later. Information such as how far disassembly proceeded at each stage, the extent of repair, and the relationship between replaced and existing components can become invisible after completion. Preserving these details in time series is a major advantage of 3D.

It is also important to hand data over for post-completion maintenance. If you retain the post-repair state as a baseline, future inspections become easier to compare. Cultural properties are subjects of long-term monitoring, not one-off repairs. In that sense, 3D has value not only for the repair work but also as foundational documentation for preventative maintenance and future repairs. From the perspective of passing on conservation results to the next generation, continuous use of 3D is highly effective.

To institutionalize operation, avoid seeking perfection from the outset. Trying to introduce 3D at the same depth for every project creates a heavy burden. Start with one of overall records, priority-area records, or milestone records, and expand where you see benefits. On conservation sites, sustainability of the approach is what matters most.

In short, the essence of this final step is to connect 3D naturally into the flow of conservation work rather than treating it as a special task. When 3D can be inserted into investigation, review, construction, recording, and management where needed, the introduction can be considered successful.

Points to avoid failure when introducing 3D in conservation and restoration

We have covered the five implementation steps, but there are several pitfalls in practice. First, beware of making 3D the goal in itself. What matters in conservation is understanding the object without diminishing its value and making appropriate repair decisions. The mere existence of 3D data is meaningless unless it is clear where it contributes to repair work; otherwise it will not be used on site.

Next, do not try to capture everything at excessive breadth and depth. While it is understandable to want both overall and detailed high-density records, in practice processing and management burdens will rapidly increase. The important point is not to have everything at the same resolution, but to allocate the appropriate density where needed. In conservation, design the recording intensity according to the object’s value and repair scope.

Also avoid delivering data in forms that on-site staff cannot use. Because 3D appears highly specialized, it may seem that only a few can handle it, which is why expanding into viewer-friendly materials is necessary. By providing plan and section references, explanatory still images, and extracted necessary parts, the value of the introduction is more likely to be shared.

Do not neglect time-point management. In conservation, whether data represents pre-repair, during, or post-repair state is extremely important. Overemphasis on increasing data quantity can lead to indistinguishable records that are difficult to compare later. For 3D records of cultural properties, context matters more than volume. Knowing when, where, and for what purpose the data was acquired creates long-term value.

Finally, do not rely solely on 3D for decision-making. Conservation decisions integrate many sources: material history, machining marks, repair traces, literature, previous surveys, and craftsmen’s observations. 3D can be a central supporting resource, but it cannot replace all other information. Correctly positioning 3D in this context avoids disappointment from excessive expectations and allows steady expansion of its use.

Conclusion

Introducing 3D into cultural property conservation and restoration is not merely adopting a new technology. It is about building a foundation to better understand the current condition, increase the evidence for repair decisions, preserve process records in reusable form, and connect to future maintenance. The major value of 3D is that it can preserve three-dimensional information that was hard to handle with photos and drawings in a more objective and shareable form.

To effectively use 3D in conservation and restoration, do not begin measurements blindly. You must clarify purpose and deliverables, understand the object and site conditions, plan acquisition, organize data, and integrate it into workflows. By following these five steps, 3D ceases to be a specialist-only skill and becomes a practical tool that supports the entire conservation process.

If you are starting to promote 3D use on conservation sites, begin with a use case that is small but demonstrably effective: overall records, capturing priority areas, before-and-after comparisons, or organizing milestone records. There is always an entry point that fits your site. The important thing is to embed it into a sustainable system aligned with the primary goal of preserving cultural value.

If you are considering 3D use that includes position information and measurement standards on site, it is also important to capture the surrounding environment and organize control points to improve positional accuracy outdoors. In such cases, combining systems like LRTK—an iPhone-mounted high-precision GNSS positioning device—can help establish positional references more easily and facilitate comparisons before and after conservation work. Considering not only the 3D data itself but also how to position and utilize it on site will be the key to practical 3D adoption in future cultural property conservation and restoration.