topic Re: problems with pipeline topography and fbx in InfraWorks Forum

problems with pipeline topography and fbx

andres_urrutia — Wed, 28 Apr 2021 23:10:27 GMT

hi everyone.

we are working in an alignement. 115km length. topography made with lidar. the area (the picture below is the infraworks model)

when we export this topography from infraworks to fbx model, the result is the next one (the model presented in A360 below is the fbx exported)

is there any chance to solve this issue??

Re: problems with pipeline topography and fbx

andrewofabley — Thu, 29 Apr 2021 04:47:26 GMT

Was this terrain surface generated from raster DEMs, or by Lidar terrain generation inside Infraworks?

Re: problems with pipeline topography and fbx

Karsten.Saenger — Thu, 29 Apr 2021 07:05:32 GMT

Hi @andres_urrutia ,

what's the file size of the FBX file?
I can imagine it's huge and there are a lot of triangles in a 115 km road profile. If you deal with large coordinates, it can happen that the triangulation gets corrupted.
Why do you export to FBX (simple mesh geometry)?

Have you tested to create the surface in Civil 3D? You need a boundary as well then.

The import into InfraWorks and export FBX there.

Other alterantive workflow:

Load the LIDAR data into Recap 2022 and create a Recap Project
Create a mesh (Recap mesh) from point cloud with the new scan to mesh workflow. (You need some cloud credits.)
Load the mesh into Recap Photo
Export FBX from there

Regards,

Karsten.

Re: problems with pipeline topography and fbx

andres_urrutia — Thu, 29 Apr 2021 11:10:03 GMT

Filesize: 185mb

The surface was generated in civil3d from contour lines.

Then I exported as a imx file to infraworks including a couple of alignment (I had an issue with this transfer also). Then the fbx file contains this 2 corridor.

Re: problems with pipeline topography and fbx

andrewofabley — Thu, 29 Apr 2021 13:17:34 GMT

@andres_urrutia

@Karsten.Saenger

My usual workflow for something this large would be to make a series of DEM tiles of the LIDAR, clip them to a buffer of the corridor extent (say 20m either side). Pull the corridors in on top and then use the same buffer as the fbx export extent.

Alternatively you could export an IMX out from Infraworks (notoriously slow at scale) and then covert this to FBX.

AutoCAD removed export of FBX, but I did write a tool for doing it that's freely available.