How do I scan with Multi-position Scan Mode? – Revopoint 3D Support

Adjust the distance and angle between the Tracker and the object based on size. Visually make sure the object is roughly centered in the vertical and horizontal field of view of the Tracker. As shown below:

Based on different scan scenarios and features of the object, plan a multi-position scan and tap the markers.

Ⅲ Multi-position Scan Overview

Multi-position Scan: Suitable for large objects (recommended for objects over 1 cubic meter) and models whose all sides (top, bottom, left, right, etc.) cannot be scanned in a single operation.

As an illustration of the above red metal box, designate the side with distinctive features as the front (A side) when positioned at the current location. Label the six sides of the metal box as follows: front, left side, rear, right side, top, and bottom, corresponding to the names A, B, C, D, E, and F, respectively. After unfolding the vector diagram of the box along the top, right, and bottom edges of the A side (shown by blue lines), the unfolded diagram is as displayed on the right.

There are two scan methods that can be selected in Multi-position Scan:

1. Multi-stop Scan 01 Leap Frogging

Using the metal box above as an example, it can be scanned at two stops, with 6-7 global markers attached at each stop, to get the complete 3D point cloud model.

First stop: Attach global markers on the A side of the box, with side A facing the Tracker. Use the Tracker to scan these global markers; at this point, the scanning range will cover sides A, B, D, and E for stop one.

Second stop: Attach global markers on the B side. First, position side A facing the Tracker and click the Start button to start scanning, then slowly move the box so that side B faces the Tracker. Complete the capture of side B’s markers; at this time, markers from both A and B sides will be collected simultaneously. Click the Complete Button. Click the Cloud Scan button at the bottom of this page to scan side C. Pause scanning, keep side B facing the Tracker, flip the box, and scan side F. Click the Pause button, rotate the 3D model in the software to check all sides are scanned completely, then click the Complete button.

Cautions:

① Plan the number of scanning stops, and attach markers (10mm) at the junction surfaces between stops; at least 5 global markers on each stop, 6-7 are recommended.

② Do not move the Tracker or model while scanning. First, scan the global markers of that stop, then scan the point cloud.

③ After the first stop, you move the Tracker or metal box to the next stop. While moving, the Scanner must recognize at least 5 markers within its field of view. Once all markers are identified, proceed to scan the next stop’s point cloud.

2. Multi-position Scan 02 Dynamic Referencing

(1) Tap global markers according to the object size and surface of the metal box. At least 5 markers must be recognizable within the Tracker’s field of view in a single frame; at least 6 in total; for larger objects, apply 5 per side.

(2) When scanning, collect all the global markers at one time, and then start to scan the point cloud. Both the object and Tracker can be moved in the scanning process (ensure the Scanner is always within the Tracker’s view).

Select the multi-position scanning mode, leapfrogging and dynamic referencing, according to the actual object. Both modes produce essentially the same scanning results, but leapfrogging may reduce human error.

With the example of the metal box, both multi-position modes will be introduced below in detail.

Ⅳ Multi-position Scan 01: Leap Frogging

Plan the number of scanning stops and where the markers will be taped.

Using the metal box above as an example, it can be scanned at two stops, with 6-7 global markers attached at each stop, to get the complete 3D point cloud model.

*Please follow the guidance below step by step to make sure to get a complete 3D cloud point model of your object.

1. Create a New Project

After the Tracker and Scanner are connected to the Revo Trackit software, click the New Project button on the software home page.

2. Select Multi-position Scan Mode

(1) Click the Multi-position Scan button in the top left.

(2) Check if the frame rate shows normal on the top right corner (computer with recommended specs should achieve >50 FPS).

(3) Click the info button (top right) to check the calibration temperatures of Tracker and Scanner, ensuring ambient temperatures match the calibration, and the difference between Tracker and Scanner is within 5°C.

(4) Place the Scanner next to the metal box, check the bottom-right to ensure the distance between Tracker and Scanner is in 1.5 to 4 m and tracking quality is good or excellent.

(5) Click the New Global Marker button in the center.

3. First Stop: New Global Marker Scan

(using Tracker to scan global markers on side A)

(1) Click the Auto button in the top left corner to enable auto depth camera exposure adjustment.

(2) In the center preview window, the Tracker must be able to view all markers on side A. (Markers are in red color with no extra noise)

(3) Make sure to place the Scanner outside the Tracker’s field of view or cover it, so that no any other markers on Scanner are detected by the Tracker. Make sure that all the markers on side A are visible to the Tracker.

(4) Click the Start button on the right. Tracker scans the global markers, until the number of total global markers at the bottom right matches the count of side A.

(5) Click the Complete button.

4. First Stop-Parameter Settings Before Cloud Scan

(1) Click the right bar to set scan mode, object type, target point distance and scanning distance.

(2) For large objects,the target point distance can be slightly increased to speed up the process efficiently. Too large a distance setting on small models may reduce real details.

(3) Confirm the settings and click the Cloud Scan button at the bottom of the page.

5. First Stop-Cloud Scan

(Scan the point cloud of sides A, B, D, E of the metal box)

(1) Click the Auto button in the top left corner to enable auto depth camera exposure adjustment.

(2) Check the Tracker tracking FOV in the bottom left corner, ensure the scanner is always in the view of the Tracker FOV.

(3) Click the Start button on the right to start cloud scan, and keep the distance histogram in the green zone during the scanning process.

(4) Scan till the surface of 3D point cloud model in the center turns green, and all the clouds are constructed successfully. If the color shows yellow, it means less scan, black means not scanned yet, use the Scanner to fill in gaps until all are green.

(5) Pause during scanning to check the scan result of each side.

(6) After scanning the cloud of one side, slowly move the Scanner to the next side, continuing until scanning for sides A, B, D, and E of the metal box are complete.

(7) Click the Pause button and rotate the model to confirm again, and click the Complete button to finish the scan of first stop.

6. Second Stop-New Global Marker Scan & Cloud Scan

(Scan the global markers of side B and the Cloud of side C)

(1) Click the Next Stop button at the bottom of software.

(2) Click the Auto button on the left top corner to enable auto depth camera exposure adjustment.

(3) Click Start button, check the number of total global markers shown at the bottom right, until the number matches markers tap on side A, slowly turn the metal box from side A to side B, the number of recognized markers should increase continuously, finally the side B is facing the Tracker, both A and B markers are collected.

(4) Once all are collected, click Complete button on the right.

(5) Click the Cloud Scan button at the bottom of the page.

(6) Click the Auto button in the top left corner to enable auto depth camera exposure adjustment. And click the Start button on the right to scan the point cloud of side C.

(7) Click the Pause button, with side B markers facing the Tracker, flip the box to expose side F, and scan the point cloud of side F.

(8) Click the Pause button, rotate the 3D point cloud model and check. Click the Complete button.

7. Post-Processing

Follow the standard workflows for one-click processing or custom point cloud fusion, meshing, etc.

Ⅴ Multi-position Scan 02: Dynamic Referencing

Using the metal box above as an example

Attach global markers on the A side of the box, the point cloud scan range could cover sides A, B, D, and E. With side A facing the Tracker, flip the box, and side F could be scanned. To ensure coverage of the hard-to-scan C side, tap another set of markers to the left B side so that global point scanning can transition smoothly from A to B.
In the global marker scan process, scan the markers on side A and B at one time, and then move the box or tracker in the cloud scan so that the complete 3D point cloud model can be scanned at once.

1. Create a New Project

After the Tracker and Scanner are connected to the Revo Trackit software, click the New Project button on the software home page.

2. Select Multi-position Scan Mode

(1) Click the Multi-position Scan button at the top left.

(2) Check if the frame rate shows normal on the top right corner (computer with recommended specs should achieve >50 FPS).

(3) Click the info button (top right) to check the calibration temperatures of Tracker and Scanner, ensuring ambient temperatures match the calibration, and the difference between Tracker and Scanner is within 5°C.

(4) Place the Scanner next to the metal box, check the bottom-right to ensure the distance between Tracker and Scanner is in 1.5 to 4m, and tracking quality is good or excellent.

(5) Click the New Global Marker button in the center.

3. New Global Marker Scan

(1) Click the Auto button in the top left corner to enable auto depth camera exposure adjustment.

(2) In the center preview window, the Tracker must be able to view all markers on side A. (Markers are in red with no extra noise)

(3) Make sure to place the Scanner outside the Tracker’s field of view or cover it, so that no markers on the Scanner are detected by the Tracker. Make sure only all the markers on side A are visible to the Tracker.

(4) Click the Start button on the right. Tracker scans the global markers until the number of total global markers at the bottom right matches the count of side A.

(5) Don’t click the Pause button, just slowly turn the metal box from side A to side B, check the total global marker at the bottom right corner increasing continuously, finally the side B is facing the Tracker, all the markers on side A and B are collected.

(6) Once all the markers of sides A and B are collected, click the Complete button on the right. Note that for a dynamic referencing scan, global markers must be collected at once; no rescan is allowed.

4. Parameter Settings Before Cloud Scan

(1) Click the right bar to set scan mode, object type, target point distance and scanning distance.

(2) For large objects,the target point distance can be slightly increased to speed up the process efficiently. Too large a distance setting on small models may reduce real details.

(3) Confirm the settings and click the Cloud Scan button in the bottom of the page.

5. Point Cloud Scan

(There must be at least 5 markers on the box always visible to the Tracker)

(1) Click the Auto button in the top left corner to enable auto Depth Camera exposure adjustment.

(2) Check the Tracker tracking FOV in the bottom left corner, ensure the scanner is always in the view of the Tracker FOV.

(3) Click the Start button on the right to start cloud scan, keep the distance histogram in the green zone during the scanning process.

(4) During scanning, the Tracker and the box can be moved, but ensure that there are at least 5 markers on the box always visible to the Tracker.

(5) Scan the point cloud of sides A, B, D, and E, till the surface of the 3D point cloud model in the center turns green, and all the point clouds are constructed successfully. If the color shows yellow, it means less scan; black means not scanned yet, use the Scanner to fill in gaps until all are green.

(6) Now click the Pause Button on the right top, and slowly turn the metal box from side A to side B. Keep side B facing the Tracker, flip the box to expose side F at the side and side C at the top. Click the Start button and scan the sides C and F until all the point cloud turns green.

(7) Click the Pause button, rotate the 3D point cloud model and check, and click the Complete button.

6. Post-Processing

Follow the standard workflows for one-click processing or custom point cloud fusion, meshing, etc.

Ⅰ System Requirements

Ⅱ Trackit Connection and Environment Setup

1. Hardware Connection

2. Environment Setup

Ⅲ Multi-position Scan Overview

1. Multi-stop Scan 01 Leap Frogging

2. Multi-position Scan 02 Dynamic Referencing

Ⅳ Multi-position Scan 01: Leap Frogging

1. Create a New Project

2. Select Multi-position Scan Mode

3. First Stop: New Global Marker Scan

4. First Stop-Parameter Settings Before Cloud Scan

5. First Stop-Cloud Scan

6. Second Stop-New Global Marker Scan & Cloud Scan

7. Post-Processing

Ⅴ Multi-position Scan 02: Dynamic Referencing

1. Create a New Project

2. Select Multi-position Scan Mode

3. New Global Marker Scan

4. Parameter Settings Before Cloud Scan

5. Point Cloud Scan

6. Post-Processing

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