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I have tried cloudcompare and the aligning ICP module like this:

enter image description here

and give transformation matrix lie this:

enter image description here

For one STL file twice and get different result for under 0.1 value in max distance like show at below pictures:

first one : enter image description here

Second aligning try:

enter image description here The above cloud compare bin file could be acceptable from here. so i like to know why this difference in results happen? does every time which i use align module it create different transformation matrix ?

Question asked also here:

https://www.cloudcompare.org/forum/viewtopic.php?f=9&t=4625

Update:

My guess is that happens because of difference between The reference STL points and the aligned target points, which here for reference is almost 26,000 point and target almost 200,000 point. which needs to select random point based of reference points in target STL file for aligning.

Thanks.

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