Faceted / Distorted artefacts: FBX import / export

[TJPovey]

Assimp version 5.0.1

I've recently started using assimp to import an fbx file, do some modifications to each vertex of the meshes, then export back out to either fbx/obj.

I've noticed that after exporting the mesh, it is distorted / very faceted. I wondered if I was doing something wrong with exporting the mesh, so removed all unnecessary code and just exported the imported scene using the below:

#include <assimp/Importer.hpp>
#include <assimp/Exporter.hpp>
#include <assimp/scene.h>
#include <assimp/postprocess.h>

Assimp::Importer importer;
const std::string& pFile = "path/to/file.fbx"
const aiScene* scene = importer.ReadFile(pFile, aiProcess_EmbedTextures);

Assimp::Exporter exporter;
exporter.Export(scene, "fbx", "path/to/export/location/file.fbx");

The original fbx file:

The exported fbx file from assimp:

Any help is appreciated.
Thanks

[kimkulling]

Hm, could I get the file to analyze this issue?

[TJPovey]

Thanks for taking the time to look into this @kimkulling, if it's relevant, the file was creating using Autodeesk AutoCAD (.dwg), opened in Autodesk Navisworks and exported to fbx. I then import this fbx using assimp.

Units are in meters, not sure if this is causing the issue.
Test_File_Real_Coords.zip

[TJPovey]

Hi @kimkulling, could this be due to the model being far from the origin? If so, would it be possible to avoid this issue without moving the model closer to 0,0?