This article aims to provide a comprehensive understanding of how to effectively utilize markers during the scanning process.
The left side is the 6mm markers; the right side is the 3mm markers.
¶ Why Use Markers
Markers, also referred to as reference points, play a crucial role in 3D scanning. When the scanner operates, it determines the coordinate information by identifying the circular reflective area of the markers, thereby achieving precise spatial positioning. Placing markers is a key step to ensure scanning accuracy.
¶ When to Use Markers
When scanning in Blue Laser Mode, you must use markers to assist tracking.
When scanning in Infrared Mode, if the object has limited geometric and texture features, it is easy to lose tracking using Geometry or Texture tracking mode. In this case, it is recommended to use Marker tracking mode.
So Generally, when utilizing the Blue Laser Mode or Infrared Marker Mode, it is essential to stick markers on the surface or around the object to be scanned before scanning.
¶ How to Use Markers
¶ 1.Sticking Position
When the object is small (e.g. the children's toy gun in the picture below), the markers do not need to be attached to the surface of the object; they can be attached to the scanning mat or table.
However, when the object is large (e.g. the car in the picture below), the markers need to be attached to the surface of the object. Please note that the markers should be randomly placed.
¶ 2. Choose the Right Markers
Markers come in various sizes, specifications, and materials, including options with adhesive backing and magnetic attachment. It is advisable to select the appropriate markers based on the structural dimensions and characteristics of the workpiece. Commonly used handheld markers typically have inner diameters of 6 mm and 3 mm, which can be mixed for optimal results.
Generally speaking, large markers are suitable for sticking on the surface of larger objects, while small markers are suitable for sticking on the surface of smaller objects. Or, when used in combination with large markers, large markers are stuck on the flat surface of the object, while small markers are stuck on surfaces with narrow stickable areas, such as near holes and grooves.
¶ 3. Marker Placement Spacing
A sufficient number of markers should be attached RANDOMLY according to the size and shape of the scanned object to avoid insufficient markers in the middle that affect the operation.
To ensure a smooth and complete scanning process, each adjacent frame of data must share at least four common points during continuous alignment. The specific spacing should be determined according to the scanner's single capture range. (Note: "Single Capture Range" refers to the total area a scanner can capture at a fixed distance. For example, in Blue Laser Mode, the single capture range of a Raptor series scanner at a distance of 300mm is 270mm x 170mm.).
Reference spacing: For Raptor series scanners, when using cross-line mode, the spacing should be 60mm-100mm, and in parallel-line mode, it should be 20mm-50mm. The Sermoon S1 requires fewer markers, and the spacing should be 80mm-150mm in cross-line and single-line modes, and 30mm-70mm in parallel-line mode.
If the object has a complex shape or structure, more markers can be attached to key locations according to its complexity, such as edges, grooves, and other complex surfaces, to ensure that at least 4 markers can be recognized by the scanner during scanning.
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Notes on Sticking Markers
¶ 1. Irregular Distribution:
Markers should be placed in an irregular distribution pattern. Avoid arranging them in regular formations such as straight lines, triangles, or circles. Regularly arranged points can lead to splicing errors, as they may create multiple points of consistency, causing the scanner to misinterpret the data.
¶ 2. Avoid Special Position:
Markers should be adhered to flat or large curved surfaces to prevent excessive bending after application. Avoid placing markers over features on the workpiece, such as holes or engravings, as this may obscure these details and hinder the scanning process.
Additionally, markers should not be applied at right angles or on edges, as this can result in bulges or depressions in the marked areas.
¶ 3. Avoid Damage:
Do not squeeze, rub, or fold the markers, as this may compromise their integrity and effectiveness.
Avoid Damage:
¶ Marker Recognition Preveiw during Scanning
During scanning, use the 3D scanner to capture the surface of the object from all angles. Ensure at least four markers are visible in the CrealityScan software’s view, which indicates the markers are placed effectively.
The green, blue, and red colors of the markers in the scanning interface indicate the distance between the currently recognized marker and the scanner. Their meanings are consistent with the colors of the distance indicator bar.