Compare your point cloud with a 3D model

In this article, you will learn how to use the scan tool in the Viewer. This tool allows you to compare a point cloud with one or more models.


  Note that this tool is not free, to use it once you have to exchange tokens, to buy tokens, access your business management page.


The point cloud / model comparison allows you to compare a point cloud with one or more models. This tool helps you see if the model you created is close to the actual item. You must remember, however, that a percentage of 100% is not achievable because the point cloud can sometimes have points in the wrong place (noise).

This feature is also available as a server-side analysis, you can find the dedicated article in the help center. The server-side comparison doesn't allow all models to be compared, as of today, only IFCs can be used, you are also unable to select part of the cloud to analyse, the chosen point cloud will be completely analysed. On the other hand, the server side analysis saves your result so you can retrieved it in 1 click the next time you open your project.


Let's open the analysis submenu, to do this, click on the magnifying glass in the left menu, then click on the cloud icon to access the comparison menu.


1. You must first select the point cloud you want to use for the analysis.


2. Go ahead and select the precision of the analysis, the smaller the number, the more precise your analysis will be, be careful though, choosing a higher quality will require more resources and more time.


3. You can then select wether you want to compare the complete point cloud or just part of it, if you do, just click the + and place your box as you wish. Only the inside of the box will be analysed.


4. Finally select the models you wish to compare to your point cloud.


5. Click on "begin analysis" and wait for it to be done

ℹ️ it may take a while if you have chosen a high level of detail, but don't worry, it's being processed, don't leave the page ℹ️

We landed on the results page, here you have your results and some new options, let's see them all.

6. At the top left, you can see 3 options :

Regarding the 2nd and 3rd options, points are displayed depending on wether they are are in or out of the tolerance defined by the 2 dots further from the middle, in our example to 10cm and -10cm.

- All points (default): All points that have been calculated are displayed

- In tolerance : Only points close to the model are displayed

- Out of tolerance : Only points far from the model are displayed


7. You can change the tolerance using the analysis range slider, drag the 4 dots to change the tolerance according to your need, if you want to be more precise, move all your points closer to the middle, if you want to get a more global idea of what is wrong and what is right, place your dots closer to the ends.

ℹ️ You can also move the dots by clicking on them to select them, then pressing the arrows on your keyboard to move them up and down (useful for precise placement) ℹ️

You will see that changing the tolerance affects the validation percentage, bringing it closer to 100% when using a larger tolerance.


8. You can see that you have 2 different validation percentages, the first is the one calculated from the 2 middle points, the second from the 2 end points.


9. Then you can see that you have a few options, the first one allows you to change the opacity of the model and the point cloud, by default both are displayed at 100% opacity.

The toggle allows you to display any unanalysed point, if any.


⚠️ The percentages we give you are indicative values , they cannot be taken for granted and are just there to give you an idea of the similarity between the point cloud and the models. ⚠️


In case of problem or difficulties, do not hesitate to contact the platform team  

Were these informations useful to you ?
Editor : Alexis Helper
Creator : Alexis Helper
Last modification : 03/11/2022

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