VRML files not displayed correctly

[ferrellsl]

Context
F3D supports loading VRML files (.wrl), however it looks like some file are being loaded incorrectly, with some transforms being ignored.

How to reproduce

• download and extract rabbit.zip
• f3d rabbit.wrl

Expected result

Notes

The original issue was stronger but was partially fixed by @jpouderoux, still some issues remain.

[mwestphal]

Hi @ferrellsl

Please share an example VRML.

Thanks !

[ferrellsl]

I've also noticed that the missing parts are displayed on the the incorrect side of the model as well. Both ears on one side of the head and both arms and both legs are on one side of the body.

Here's the rabbit VRML file

rabbit.zip

[ferrellsl]

Here's another example of a snowman and how it should appear:

but in f3d, it renders like this:

Here's the zip file for the snowman:

snowman.zip

[mwestphal]

Here are examples VRML that works perfectly if that helps @ferrellsl :
http://alexei.nfshost.com/3d/virtual.html

Looking at your data it looks like the Transform is not working as expected in vtkVRMLImporter that we use in F3D.
I've opened an issue upstream but I'm not sure VTK devs will look into this as this class is not heavily used considering this bug has been present 8 years in VTK.

FYI @jpouderoux looks like you worked on this in VTK at some point :)

https://gitlab.kitware.com/vtk/vtk/-/issues/18982

[ferrellsl]

Here are examples VRML that works perfectly if that helps @ferrellsl : http://alexei.nfshost.com/3d/virtual.html

Looking at your data it looks like the Transform is not working as expected in vtkVRMLImporter that we use in F3D. I've opened an issue upstream but I'm not sure VTK devs will look into this as this class is not heavily used considering this bug has been present 8 years in VTK.

FYI @jpouderoux looks like you worked on this in VTK at some point :)

https://gitlab.kitware.com/vtk/vtk/-/issues/18982

Actually they don't all render perfectly. This one in particular totally crashes f3d on my system.

http://alexei.nfshost.com/3d/cockranm.wrl

[mwestphal]

Indeed, yet another issue in VTK.

https://gitlab.kitware.com/vtk/vtk/-/issues/18983

[mwestphal]

Both fixed in VTK and availiable in F3D nightly: https://github.com/f3d-app/f3d/releases/tag/nightly

enjoy @ferrellsl :)

[ferrellsl]

Well, that fixed most of the rabbit except its right eye and right whiskers, which should be black.

There's still an issue with geometry on the snowman model. It still renders improperly. The arms are missing, colors are missing, and the nose is on the wrong plane and not attached to the face as in the images I shared in my earlier post.

There also seems to be an issue with color space or color gradients. This lunar crater model should appear like this

But it gets rendered in green by f3d.

I've attached the lunar crater model
lunar-crater.zip

[jpouderoux]

@ferrellsl Thanks for your report, I will take a look and see if we can fix that easily.

[mwestphal]

Any luck with that @jpouderoux ?