Tips for Successful Scanning
Scanning with Freestyle 2 is easy, but there are some guidelines which will help you get the best results.
- Plan how you will scan the objects of interest before you begin, taking the following recommendations into consideration:
- The longer a single scan takes, the longer the processing time will be. Try to keep scan times as short as possible—under 5 minutes is best.
- It is better to have one scan that captures all objects of interest than to have several scans. Fewer scans means less registration.
- Move the handset slowly and constantly, avoid jerky movements. Fast and jerky movements may lead to inaccurate data or tracking may be lost.
- Accuracy and tracking may be improved if you avoid excessive twisting movements while scanning:
- Make sure that the objects of interest are within the specified maximum range and minimum range of the handset.
- Objects or surfaces may have an increased noise or reduced data if they are directly illuminated by bright sunshine.
- Use markers for high accuracy tasks
- If the number of features is low or badly distributed, try to move the handset's field of view to areas with more structures.
- Scanning areas with few features or without texture can be difficult. Add markers or other artificial targets for better results.
- If the lighting conditions are bad, use the flashlight to get better results.
- If you are not able to scan dark areas, treat these with developer spray.
- If you are not able to scan shiny areas, treat these with anti-glare spray.
- Try to move the handset in circles or loops. This helps with loop-closing.
- When scanning all sides of an object, start and stop at “less interesting” positions. For example, when scanning a person, start and stop at the back.
- Try to finish a scan at the place where you began. This helps with loop-closing.
- Objects must not move while they are captured.
- Scanning your shadow while making outdoor scans
- Having only plain-colored surfaces (e.g., a white wall) in the handset’s field of view
- Having only shiny surfaces in the handset’s field of view, example metal rails, or high-gloss lacquer
- Having only highly absorbing surfaces in the field of view, for example black furniture
- Scanning when the temperature is lower than 0 °C or higher than 40 °C
- High concentrations of dust, fog, rain or snowfall. This may result in bad measurements. Avoid scanning under these conditions.