CloudCompare forum

Daniel, The clouds I sent you are a few of the same types of scans I am having issues with. When I hit guess parameters, it fills in projection and normals with numbers like .0000001. It will run when I use numbers like .05, but then the change I get is wrong. We used the box to try to understands a...

Daniel, I have shared two scans with you. The lower number in the title is the first scan with the box present, and the higher number scan is the image without the box. So to clarify, when I use the volumetric tool I do have to adjust the scan order depending on direction? That is correct to do? Wha...

Daniel, Yes, I would be happy to share an image with you. They are large files, what is the best method for doing this? I can share a link to a dropbox if you have an email you can share. Basically, everything I use the guess parameters option in M3C2 it crashes and stops working. Also, when I'm usi...

Hello, I am trying to run M3C2 to calculate distance change so I can then convert that distance to a volumetric calculation to see if Cloud can accurately show the removal of an object from one scan to another. It will not accurately do this, and when I run on the guess parameters setting cloud cras...

Daniel, This information is great! A few final questions. a. If using the M3C2 tool, and ONLY changing the 'scale' parameter...what is a good value for high density scans? (billions of points, and large area covered). b. What is considered a small step value? 1.0, 5.0? Again, my scans are fairly lar...

Daniel, I was reading the wiki pages in the volume calculation and M3C2. I am curious, which is preferred for natural erosion and which for the removal of something non-natural, like a box? I am running different types of calculations and I wonder if the M3C2 is more accurate for natural landscapes,...

Daniel, I am playing with the volume tool you suggested. What are the units associated with the return values Cloud provides? Also, for projection direction and the drop down for empty cells, should I leave that empty? What parameters result in the best accuracy? I chose projection direction as Z, t...

Yes! It will be used basically give me a positive or a negative change value that I can infer to be erosion or deposition! But I like the idea of the volume change tool. This should provide an accurate volumetric change detection between two scans? (I placed a box in one scan and took it away for th...

I am planning to use CloudCompare to quantify volumetric change between two scans. I was wondering what the differences are that impact how accurate the change detection is....what is the benefit of using the default setting vs. manually entering in values for Multi-scale parameters such as min, ste...

Daniel,

Yes, the scans with strange height values have relatively low errors.

Carly