huge scan data handling by manual align method
DESCRIPTION
Huge Scan Data Handling by Manual Align MethodTRANSCRIPT
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INUS Technology, Inc. Phone: +82.2.6262.9900 Fax: +82.2.6262.9999 http://www.rapidform.com [email protected]
601-20 Yeoksam-dong Gangnam-gu Seoul 135-080, KOREA
INUS Technology, Inc.
How to handle huge scan data by the manual align method
This scan data is handled by normal PC. This PC has Geforce 6600LE graphic card and 3.2 GHz of CPU, 2G RAM etc. The time required for processing is about two hour.
Import Data 1. Click Insert > Import to open the Import dialog box. 2. Select all files. 3. Select Points Only option. 4. Press the Run Mesh Buildup Wizard button.
Note To handle huge scan data, check the Points Only option to import only point clouds without triangles. Changing the Sampling Ratio option is also another way to import huge scan data which contains only point clouds. After loading the scan data it looks as given in the image below. This is not an aligned scan data.
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INUS Technology, Inc. Phone: +82.2.6262.9900 Fax: +82.2.6262.9999 http://www.rapidform.com [email protected]
601-20 Yeoksam-dong Gangnam-gu Seoul 135-080, KOREA
INUS Technology, Inc.
Preparation
1. If you have huge scan data, sometimes your computer will use an over memory. Accordingly, click RMB in left dialog tree and click the “Suppress” on the model with the selected data temporarily removed from the model, which will be used to align. .
Note In the Mesh/Point cloud, suppressing will save more memory of your machine then showing all scan data. Because scan data is unloaded, your machine will save memory. Note Some model data has bottom areas. If you delete the bottom area, you will get good results
from alignment and merging.
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INUS Technology, Inc. Phone: +82.2.6262.9900 Fax: +82.2.6262.9999 http://www.rapidform.com [email protected]
601-20 Yeoksam-dong Gangnam-gu Seoul 135-080, KOREA
INUS Technology, Inc.
Align Most models are automatically aligned by Local based On Auto Guess. But sometimes it
fails to automatically align. Therefore we must use manual method to align by using Local Based On Picked Point.
1. Click Tools > Scans Tools > Align or click the (Align) icon in the bottom tool bar. 2. Check Local Based On Picked Point. This method is the manual alignment.
3. Select aligned meshes as Reference and the other mesh as Moving.
4. Manually pick corresponding points on the meshes in Reference window and Moving
window. Click (Apply) button to apply the alignment. You can get the result of an aligned part as shown in the below image.
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INUS Technology, Inc. Phone: +82.2.6262.9900 Fax: +82.2.6262.9999 http://www.rapidform.com [email protected]
601-20 Yeoksam-dong Gangnam-gu Seoul 135-080, KOREA
INUS Technology, Inc.
Note If you want to cancel the last picking, click Edit > Undo or Ctrl+Z.
5. Click the RMB in left dialog tree and click the “Suppress” in the aligned data, And then click the “Unsuppress” at the under data to cancel suppress command.
You can see the other data as shown in the below image.
6. You will combine each part as shown in the image below by same method again and again. Shown below is a result of aligned scan data.
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INUS Technology, Inc. Phone: +82.2.6262.9900 Fax: +82.2.6262.9999 http://www.rapidform.com [email protected]
601-20 Yeoksam-dong Gangnam-gu Seoul 135-080, KOREA
INUS Technology, Inc.
Note Most of the personal computer has a maximum 2G RAM in Window XP. So if you have a huge scan data about over one hundred million, XOR2 will over use the memory and will be able to only align. Therefore you must divide the scan data into different parts. Note If you have scan data which is not aligned because of lack of geometrical shape information, XOR2 will show you which scan data was not aligned and enables you to align that scan data manually. Note Quality of merge and process time are affected by the quality of alignment. If aligned scan data has bad data quality and if there exists big gap between two scan data, XOR2 will create so many mesh in the gap that would take a great deal of time. So when you align
scan data, you will have to be careful in deciding what to align.
Merge
1. Click Tools > Scan Tools > Triangulate/Merge or click the (Triangulate/Merge) icon in the bottom tool bar.
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INUS Technology, Inc. Phone: +82.2.6262.9900 Fax: +82.2.6262.9999 http://www.rapidform.com [email protected]
601-20 Yeoksam-dong Gangnam-gu Seoul 135-080, KOREA
INUS Technology, Inc.
2. Click the Mesh / Point Cloud button and select all entities which need to be a single mesh. 3. Adjust Mesh Density and check Reduce Noise option.
Note When regenerating poly-face, it determines the density of a mesh. Accordingly if you want
to have a sparse mesh data, you can make a higher dense mesh data using Mesh Density option. Note If you check Remove Original Data option, original data will be removed so that only merged data is retained thus saving memory in your machine and in the volume of HDD.
4. Click the icon to apply and to combine mesh data. In order to merge each part as given below repeats the same method again and again. The following is a result of the merged scan data.
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INUS Technology, Inc. Phone: +82.2.6262.9900 Fax: +82.2.6262.9999 http://www.rapidform.com [email protected]
601-20 Yeoksam-dong Gangnam-gu Seoul 135-080, KOREA
INUS Technology, Inc.
5. You can see the final result as given in the image below.
Check
1. If you want to check the deviation, compare the original mesh data with the final data using
Accuracy Analyzer™. 2. Check Deviation and uncheck Hide Allowable Tolerance.