Votes
0
Product:
3DXchange 7
Version:
7.81
Status:
Assigned
Issue 8108
3DXChange Imports Geometry Incorrectly
Exported a tire from Blender using OBJ and the FBX file format.
Importing the tire using the OBJ file causes crash (issue for this problem is already open).
Importing the tire using the FBX file causes the geometry and UV mapping to be imported incorrectly.

Enclosed is a snapshot of the Blender render. As can be seen, the tire is supposed to be hollow inside (and this is not done with an opacity map, it is done so with the mesh).
Enclosed is also the geometry that is imported via 3DXChange. As can be seen the first problem is that the geometry is wrong. The tire is no longer hollow on the inside. In addition, the UV mapping seem to be imported incorrectly because the hub cap texture is missing while the tire tread is present. Both the hubcap texture and tire tread come from the same texture map so the texture map is loading but the UVs for the hubcap portion of the tire are not loading correctly.

Note: While it is a little hard to see with the black texture, I have confirmed that the 3DXChange imported geometry is not hollow. This can be easily seen when the texture is changed to something more lighter.
OS: Windows 10
Attachment:
  • Import_Issue_01.png
  • Import_Issue_02.png
  •  8
  •  1280
Bug
Submitted byLord Ashes Sep 13, 2021
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COMMENTS (8)
Lord Ashes Sep 30, 2021 
There are supposed to be 7 comments to this issue (8 after this one) but only 5 are showing.

The original Tire model when saved as FBX (Tire.fbx) imported into 3DXChange but was not hollow (imported incorrectly).
The original Tire model when saved as OBJ (Tire.obj) causes 3DXChange to close without any error.

I then tried triangulating the mesh of the model and tried again...

The triangulated mesh Tire model when saved as FBX (Tire_Tri.fbx) imported into 3DXChange correctly.
The triangulated mesh Tire model when saved as OBJ (Tire_Tri.obj) caused a fatal error message and then closed.

Both versions plus textures are included in the attached file.
Feedback Tracker Admin Sep 30, 2021 
Hi Lord Ashes，

I have got it and transfered it to RD department.Thanks.

Molly
Reallusion
Feedback Tracker Admin Sep 30, 2021 
Hi Lord Ashes，

I have got it.Thanks.But I see the tire is hollow and I don't know what's wrong of UV,I import your FBX yo Unreal,it looks the same in 3DX and unreal.Can you explain in detail where UV is wrong？

Molly
Reallusion
Attachment:
  • 6.jpg
Lord Ashes Sep 30, 2021 
The following zip includes the OBJ, MTL, FBX and textures.
Feedback Tracker Admin Sep 30, 2021 
Hi Lord Ashes，

Please provide textures of FBX file to us,I can't conform this issue without textures.Thankk.

Molly
Reallusion
Lord Ashes Sep 28, 2021 
The enclosed ZIP contains the original Tire.OBJ, a triangulated geometry version Tire_Tri.OBJ and then the FBX.

The Tire.OBJ causes 3DXChange to close up typically with no error message.
The Tire_Tri.OBJ causes 3DXChange to generate an exception and then close.
The Tire_Tri.Fbx is the only version that imports correctly.
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