Unlock the Magic of 3D Scanning: Get Started for FREE with Your Phone

Unlock the Magic of 3D Scanning: Get Started for FREE with Your Phone

Table of Contents:

1. Introduction
2. Importance of Lighting in 3D Scanning 2.1. Avoiding Hard Shadows 2.2. Lighting Techniques for Accurate Scans
3. Preparation before Scanning 3.1. Propping the Object 3.2. Considering the Surface of the Object
4. Using the KIRI Engine App 4.1. Benefits of Cloud Computing 4.2. Steps to Scan Using KIRI Engine
5. Taking Photos for 3D Scanning 5.1. Ensuring Stability and Overlap 5.2. Capturing Different Layers 5.3. Recommended Number of Photos
6. Processing the 3D Model 6.1. Uploading and Processing Photos 6.2. Previewing and Exporting the Model
7. Cleaning and Modifying the Scan in Fusion 360 7.1. Inserting and Scaling the Mesh 7.2. Removing Unwanted Mesh Facets 7.3. Closing Holes and Repairing the Mesh 7.4. Separating and Removing Mesh Shells
8. Conclusion

Photogrammetry: Tips and Techniques for Accurate 3D Scanning

Introduction Photogrammetry, also known as "3D scanning," offers a convenient way to capture detailed and accurate 3D models using smartphone apps. However, achieving desirable results can be challenging without employing proper techniques. In this article, we will explore five key techniques that can help you improve the quality of your 3D scans. From understanding the importance of lighting to optimizing the scanning process, we will guide you through step-by-step instructions to ensure successful outcomes.

Importance of Lighting in 3D Scanning

Avoiding Hard Shadows One of the critical considerations in 3D scanning is the lighting setup. Hard shadows can distort the scanned object and affect the overall quality of the model. To mitigate this issue, it is crucial to find a suitable location away from windows, as changes in natural lighting can impact the consistency of the photos. Instead, opt for a windowless room or hallway and make use of LEDs or photography lights to illuminate the object evenly. Overhead lighting can help minimize the formation of hard shadows in a single direction.

Lighting Techniques for Accurate Scans To ensure accurate and detailed 3D scans, it is advisable to prop the object above the table's surface using an item like a toilet paper roll. This elevation not only simplifies the cleaning process but also reduces unwanted shadows. Additionally, consider the surface of the object itself before scanning. Reflective or metallic surfaces may require spray painting or covering with another material. Similarly, if you encounter issues with solid white or light surfaces, applying sidewalk chalk can enhance the details in the photos, resulting in a highly accurate scan.

Using the KIRI Engine App

Benefits of Cloud Computing The KIRI Engine app stands out among smartphone 3D scanning apps as it utilizes cloud computing for processing scans. This approach offers several advantages, including enhanced detail and better results compared to on-device processing. Additionally, you can initiate multiple scans while others are being processed, optimizing your workflow. Users have reported more consistent results with KIRI Engine than with lidar 3D scanning methods on iPads, making it a reliable choice for smartphone-based photogrammetry.

Steps to Scan Using KIRI Engine To initiate the 3D scanning process with KIRI Engine, select the plus symbol in the app and start capturing photos of the object. Ensuring the object remains perfectly still, take photos from various angles, maintaining significant overlap to avoid holes in the final scan. While turntables are not recommended for smartphone-based photogrammetry, having elements of the background in each photo helps the app stitch them together accurately. Capture multiple layers of photos, adjusting the level and angle, and aim to take 50-200 photos for optimal results. Once the photos are captured, upload them to the cloud for processing.

Processing the 3D Model

Uploading and Processing Photos After uploading the photos to the cloud, the processing time may vary, typically taking around 5-20 minutes based on the number of photos used. You can monitor the project status on the home page of the app. Once the processing is complete, you can preview the 3D model directly on your mobile phone, ensuring the results meet your requirements before proceeding to further steps.

Previewing and Exporting the Model To proceed with 3D printing or modifying the scan using a computer-aided design (CAD) package, you can export the model in various file formats. The KIRI Engine app provides the option to download an OBJ file, which includes 3D information and texture mapping for enhanced visual representation. Additionally, you can explore other file types included in the downloaded zip folder. To modify the scan further, Fusion 360 provides comprehensive tools for editing and refining the 3D model.

Cleaning and Modifying the Scan in Fusion 360

Inserting and Scaling the Mesh To clean up or modify the 3D scan within Fusion 360, utilize the Insert Mesh option available in the Insert menu. This option allows you to adjust the orientation and position of the scan efficiently. Aligning the bottom of the TP roll with the bottom origin plane helps establish consistent scaling measurements. Although Fusion 360 lacks a direct two-point scaling feature, creating a reference line equal to the TP roll's diameter facilitates the scaling process. Keep in mind that this method is suitable for projects that do not require precise tolerances.

Removing Unwanted Mesh Facets Most 3D scans generated by photogrammetry apps include warnings about unclosed mesh sections, often due to openings at the object's bottom. To prepare the model for 3D printing, it is necessary to create a smooth planar face on the bottom surface and fill the void appropriately. Fusion 360's Plane Cut feature, available in the Mesh menu, can help accomplish this. Selecting the mesh body and setting the appropriate cut plane enables you to remove unwanted mesh facets efficiently. By adjusting the fill type to uniform or minimal, you can achieve the best results without affecting the surrounding faces.

Closing Holes and Repairing the Mesh In some instances, the Plane Cut alone may not resolve the warnings related to mesh openness. Fusion 360 offers a Repair tool that can assist in closing any remaining holes in the model. By selecting the "Close Holes" repair type, you can ensure the model is watertight and free from unwanted openings. However, the repair process may vary depending on the object and the quality of the 3D scan. Analyze the scan carefully and utilize additional mesh functionality software like Meshmixer or NetFabb for more intricate repairs, if necessary.

Separating and Removing Mesh Shells In scenarios where the 3D scan includes multiple mesh shells or unwanted scan data in empty space, you can take advantage of the Separate tool. This tool allows you to isolate and remove individual mesh shells, streamlining the 3D model for further refinement. Once the separate bodies are identified, Fusion 360's Remove tool in the Browser facilitates their removal, leaving you with a clean and optimized 3D model ready for printing or reverse engineering purposes.

Conclusion By following the techniques and procedures outlined in this article, you can significantly improve the quality and accuracy of your 3D scans using smartphone-based photogrammetry. From understanding the importance of lighting to utilizing advanced tools in Fusion 360, you now have the knowledge to optimize your scanning workflow. Embrace the capabilities of modern technology and unlock the possibilities of capturing stunning and precise 3D models for various applications.

Highlights:

• Learn the essential techniques for achieving accurate and detailed 3D scans with smartphone apps.
• Understand the significance of lighting and how to avoid hard shadows in your scans.
• Discover propping and surface considerations for better scan results.
• Explore the benefits of using the KIRI Engine app and cloud computing for advanced photogrammetry processing.
• Master the process of capturing photos for 3D scanning, including stability, overlap, and layering techniques.
• Follow step-by-step instructions for processing and previewing your 3D model using the KIRI Engine app.
• Learn how to clean up and modify your scans in Fusion 360, including scaling, removing unwanted mesh facets, and repairing holes.
• Obtain insights into separating and removing mesh shells to optimize your 3D models.
• Prepare your scan for 3D printing or reverse engineering applications.
• Unlock the potential of smartphone-Based photogrammetry and revolutionize your 3D scanning workflow.

FAQs: Q: Can I achieve high-quality 3D scans using smartphone apps? A: Yes, by following the techniques mentioned in this article, you can capture detailed and accurate 3D scans using smartphone apps.

Q: How important is lighting in 3D scanning? A: Proper lighting is crucial in 3D scanning as it helps avoid hard shadows and ensures consistent and accurate results.

Q: What is the recommended number of photos to capture for a 3D scan? A: The recommended number of photos typically ranges from 50 to 200, depending on the object and the level of detail desired.

Q: How can I modify and clean up my 3D scan in Fusion 360? A: Fusion 360 provides various tools for scaling, removing unwanted mesh facets, and repairing holes in the 3D scan, ensuring a clean and printable model.

Q: Can I use smartphone-based photogrammetry for reverse engineering? A: Yes, you can use smartphone-based photogrammetry to capture reference 3D models for reverse engineering in Fusion 360.

Q: What are some additional software options for advanced mesh functionality? A: Meshmixer and NetFabb are popular software options that provide additional functionalities for refining and repairing mesh models.