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Compare your point cloud with a 3D model

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

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Please note that this tool is not freely available for use. Each utilization of the tool requires tokens. You can obtain tokens by purchasing them or accessing your trade management page. For more detailed instructions, refer to this article.

 

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 real item. It should be remembered though that a percentage of 100% is not achievable, as the scatter plot may sometimes have points in the wrong place (noise).

To access the analysis window, navigate to the advanced tools menu and select the magnifying glass icon.

Before initiating the process, there are a few actions to undertake in the analysis window. Firstly, designate a name for your comparison, ensuring it is meaningful to you and your team. Secondly, select the point cloud and model that you wish to compare. Lastly, specify the analysis density. A lower density provides greater precision but requires more time, while a higher density sacrifices precision for quicker results. If you're unsure, it's advisable to leave it at the default setting.

Click on "Analysis" to commence the process.

 

To monitor the status of your comparison, navigate to the "History" tab. Here, you will find a record of all comparisons conducted within the project. You can observe that our comparison is currently underway.

 

Upon completion of the analysis, you will receive an email notification. Return to the "History" tab and load your comparison to view the results.

 

Now that you've viewed the results, let's discuss the color scheme and available viewing modes.

Upon examination, you'll notice a color gradient ranging from red to blue. Red points signify no collision with the model, while green points represent perfect alignment. Blue points indicate those within the model. For instance, if points are inside a modernized pipe, they'll appear blue; if outside, they'll be red. Yellow, orange, and cyan shades denote points almost correctly aligned with the model but not precisely so.

The default mode is "All Points", where every analyzed point is visible. You'll find a slider with two handles to adjust the tolerance, typically set at -3cm / +3cm by default. You can adjust these values by dragging the handles or directly inputting numbers. Below, you'll see a percentage indicating the proportion of points colliding with the model. For example, if it shows 61.48%, it means that 61.48% of the point cloud has been accurately modeled.

 

In the second mode, "Inside Tolerance", you'll observe only those portions of the point cloud that have been accurately modeled. The slider now features four handles, enabling you to set two different tolerances simultaneously. The outermost handle dictates which points are visible and invisible, while the inner one establishes the default value for the red to blue color gradient. Additionally, you'll notice two validation percentages corresponding to the two tolerances.

 

In the final mode, "Outside Tolerance", you'll exclusively observe the missing parts of the model. This mode utilizes a single tolerance setup, focusing on the largest tolerance range. The color gradient disappears, leaving only the red and blue points visible.

 

After leaving and returning to the project, your comparison will be listed among the elements. Click on it, then navigate to the "Actions" tab and click on "Analysis" to directly open the render of that specific comparison.

 

If you run into any issues, our support team is here to help. Happy exploring!

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Editor : Alexis Helper
Creator : Alexis Helper
Last modification : 08/02/2024

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