Question

Bug with the transformation of LAS file to Cesium 3D tiles

  • 25 February 2021
  • 9 replies
  • 28 views
T

Hey everybody,

I'm currently trying to transform LAS file into Cesium 3D Tiles with FME Workbench.

Las file is provided by an Agisoft Metashape project with EPSG:3945 coordinates. I would like to transform this points cloud into Cesium 3D Tiles with EPSG:4326 coordinates.

I can't use Cesium ion for my project.

Unfortunately, I obtain this strange result. First screenshot is the original file and the second one transformed file.

Has anyone run into the same problem ? Can someone help me to handle it ?

Have a nice day !

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9 replies

daraghatsafe
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Hi @thomaspetit​ if you inspect the LAS data in the Data Inspector and look at the feature information are the x, y, and z components set to Real32? If so you could use a PointCloudComponentTypeCoercer to change them to Real64. I had this issue with an E57 file but it may help with LAS.

T

Thanks for your answer, I tried a lot of things without any concluant results.

Whatever the way, it leads to the same warning :

1 Attachment
daraghatsafe
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@thomaspetit​  Can you provide the workspace?

T

Here is it

T

Do you see what's going wrong ?

daraghatsafe
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Do you see what's going wrong ?

Hi @thomaspetit​ sorry for the delay, yes I can see the issue, can you provide the LAS file also?

Thanks, Daragh

T

Hi @thomaspetit​ sorry for the delay, yes I can see the issue, can you provide the LAS file also?

Thanks, Daragh

Hi,

I can't send you the original file but here is a wetransfer to a similar file : https://we.tl/t-kQEiKLSBy5

Thanks, Thomas

daraghatsafe
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Hi @thomaspetit​ sorry for the delay, yes I can see the issue, can you provide the LAS file also?

Thanks, Daragh

Hi Thomas,

 

So looking at the documentation for Cesium 3D Tiles, FME does not support the writing of point clouds. So a workaround to this is to create a surface of the point cloud and drape the appearance over it. Please also so see these two articles for an explanation on some of the transformers that I used.

https://community.safe.com/s/article/creating-a-raster-from-a-point-cloud

https://community.safe.com/s/article/point-cloud-to-3d-terrain-model-with-buildings-dwg

I have attached the workspace so you can see if it works for you.

Thanks, Daragh

T

Hi @thomaspetit​ sorry for the delay, yes I can see the issue, can you provide the LAS file also?

Thanks, Daragh

Hi Daragh,

 

Thanks for all your help !

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