This document aims to help 3D scanning beginner quickly master the techniques for capturing complete, high‑precision 3D hand models. We hope these practical tips will assist you in capturing every subtle detail and smoothly bridging the gap from data acquisition to real‑world application.
- Open the CrealityScan software and select the appropriate scan parameters based on the recommended range for the current mode.
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- Start scanning with the palm as the first frame.
Purpose – establish a reference plane: The palm area is rich in features (palm lines, the indentation in the middle of the palm), making it an ideal initial alignment reference plane. It provides a stable coordinate foundation for subsequent scanning expansion.
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- Starting from the palm, quickly scan across the entire palm area, and then continue scanning all the way to the tips of the five fingers.
Purpose – dynamic transition for noise reduction: Use the continuous, feature‑rich areas of the palm and fingers to achieve fast alignment transitions as the scanner moves. This smooth trajectory helps offset or distribute relative displacement errors caused by slight physiological hand tremors, preventing excessive error accumulation at any single point.
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- Adjust the scanner orientation so that the two depth cameras forms a 45° angle with the palm plane. Aim at the base of the hand (wrist junction).
Principle: The scanner relies on both cameras simultaneously capturing surface features of the object, with the light source illuminating those features to create diffuse reflection. The 45° angle ensures that in the transitional area of the wrist (where surface curvature changes significantly), the system can leverage palm and finger features to achieve optimal stereo matching.
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- Move the scanner to the top of the hand (base of the fingers), keeping the same 45° angle between the scanner and the palm. Increase the distance between the scanner and the hand (i.e., extend the depth of field) so that the scanner’s lenses can simultaneously capture features of both the wrist and the thumb. Slowly move the scanner to scan the back of the hand..
Purpose: Increasing the distance expands the field of view of each frame, ensuring the scanner captures both the proximal wrist and the base of the thumb (the thenar space). Using these feature‑rich areas as a bridge enables a seamless transition from the palm to the back of the hand, avoiding model layering.
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- Quickly scan the entire back of the hand and capture the data at the tips of all fingers.
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- Again adjust the scanner to the 45° stereo camera orientation relative to the palm, and Perform a repeat scan of the wrist area to ensure completeness.
Purpose: This step both fills in any missed details and closes the data loop. The favorable feature angles help correct any remaining errors.
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- In the software, delete any extraneous data generated during scanning (e.g., background, supports), leaving only the complete hand model.
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- Use the fusion function to convert the point cloud data into a triangular mesh model.
Purpose: Transform the discrete point cloud into a continuous triangular mesh surface for easy editing and subsequent applications.
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- Use the meshing function, enable the “Closed” mode, and automatically repair missing areas caused by blind spots or incomplete data.
Explanation: The “Closed” mode intelligently fills holes based on surrounding curvature, ensuring the model is completely closed.
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- Choose an appropriate file format (e.g., STL, OBJ, PLY) and export the final 3D model.
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