The most comprehensive summary of mobile phone 3D reconstruction skills

Suggestions on lidar scanning and reconstruction with iPhone or iPad;

(1) Check the scanning target and its surroundings, and choose whether there are obstacles and scanning routes. Many people may think that this is not the case, but even if there is no preview in 3D scanning, it is almost impossible to make a high-quality model of 100%. Be sure to simulate how to shoot the target and the moving route.

(2) Don't scan the same area multiple times. The lidar of Apple's mobile phone will accumulate errors every time it scans. So even if the same part is scanned, the position between the first time and the second time will be slightly different. Avoid scanning the same area, as this will lead to ghosting in the final model.

(3) Move slowly and smoothly during scanning. It is absolutely impossible to change direction suddenly. In my experience, walking scanning usually has a negative impact on accuracy and texture. Let's move slowly with our rubbing feet.

(4) When scanning outdoors, please try to choose cloudy days. It is usually difficult to scan well in dark or sunny days.

(5) Keep the distance between the scanning target and the equipment about 1 ~ 2m ... Please note that if your equipment is close to the target, it is usually impossible to track it well.

(6) Please note that when scanning a monochrome scanning target or a noisy object such as carpet or lawn, the tracking usually changes.

(7) When scanning continuously, please pay attention to the temperature of the equipment. If the temperature of the device rises too high, the performance of the device will be greatly reduced, which will adversely affect the scanning.

(8) When scanning, you can easily track by capturing characteristic objects (objects with clear details and sharp edges, etc.). ) On the screen.

(9) Be sure to check the generated model after scanning. The model may have holes, or the texture may be seriously misplaced.

Other experiences are as follows:

The following is a summary of some commonly used 3D reconstruction applications, which can be directly exported to Sketchfab:

3D scanner application

3D scanner is a simple and powerful tool, which can create 3D models of objects and spaces in a few minutes. This application captures anything in a 3D environment through a mobile device. Use your mobile device to convert any object or space into a 3D model for easy saving and sharing.

It provides many functional options. For example, you can easily select or trim in the application, or even use the sphere to trim. I found that this application is especially suitable for smaller things, such as this banknote. Make sure to use HD mode.

Polycam

Polycam is very fast and does a good job in texture. It can be processed in HD mode and measured in real time. The author likes to use it to scan rooms, murals or street works of art.

APP official website Introduction:/

Website landscape

SiteScape can quickly process point clouds with accurate results. You can adjust the density and size of points. It can be used to deal with complex scenes or structures. The effect of automobile scanning reconstruction is also very good.

APP official website Introduction: https://www.sitescape.ai/

Every point

Everypoint is suitable for large point clouds, such as the three-dimensional reconstruction of the whole subway. The application claims that it will soon release an application that combines lidar and photogrammetry, and can't wait to try it.

APP official website Introduction: https://everypoint.io/