Serious Rhino Datasmith Bug

General Feedback & Requests
,
1

I made the model in Rhino 7 and exported it using the Datasmith plug in. I didn’t change anything everything was in Default setting when exporting and importing.
When I open in UE5 all the meshes have gaps between each others like attached.
Is there anyone who got the same errors? Please let me know how to fix it.
The first image is the model in Rhino. The second and third one are images of UE5. You can see all the gaps between the meshes.

bug1
bug11567×1129 118 KB

bug2
bug21511×769 157 KB

bug3
bug31669×727 98.9 KB

The weird thing is that if I import the original 3dm file from UE5 directly (not the datasmith file) the meshes looks fine like the following but the textures are not mapped even I choose to import the material and textures.

bug5
bug51385×736 60.2 KB

Using the datasmith plugin in Rhino to export Datasmith file and open the datasmith file in UE5 is best way but it has critical problem that there are gaps between the meshes as above images. This problem is not the file problem of my Rhino file because I tried with different Rhino files and every time I can see there are always gaps between the meshes.

Please let me know any solution for this issue.
Thanks,

2

Hello,
could you share the model with us? Send me or @Antoine_Guillo the model in a private message.

Import directly in UE is a completly different process so it is nor surprising to get different results.
Are you using the “import as Nurbs” option?
Can you try to see what happens with the “import rhino meshes” options?

Anyway you are right, the udatasmith pipeline should work better.

image

Bests,
Flavien.

3

Hi, Thanks for the reaply,

Actually I think I found the reason.
The model in my Rhino file was 580km far from the origin point(0,0,0).
I think that was the problem.
I moved the model to the origin point in Rhino and export Datasmith file and imported the Datasmith file in UE5.
And there is no gaps. I think being too far from the origin point in Rhino made that problem.

Thanks,

4

Yes,
that could be it when using less precise float values on transform and coordinates of meshes’ vertices.

In UE5 we are adding option to enable Large World Coordinates, but AFAIK the exporters are still relying on floats for vertice coordinates and transforms, so you lose precision in conversion.