Import Google SketchUp models into jME3

Troubleshooting import-assets
1

All,



I’m loading Google SketchUp models into a jME3 app by export from GS as .OBJ, then using AssetManager.loadModel(). The place where I run into an issue is that the .OBJs include polygons, and OBJLoader says:



[java]

if (vertList.size() > 4 || vertList.size() <= 2)

logger.warning(“Edge or polygon detected in OBJ. Ignored.”);

[/java]



and



[java]

// face, can be triangle, quad, or polygon (unsupported)

[/java]



It seems like my options are to:


  • Understand the jME3 code and issues well enough to modify it to support polygons (and give back to the community)

  • Write a converter that will convert the polygons to a series of triangles and quads

  • Export as a different format that jME more fully supports

  • Find a converter that will convert Sketchup files to .OBJ without using polygons



Can someone offer advice as to what my short path is here?
2

Live rendering only works with triangles anyway, so for game models you’d have to go the triangle way anyway.

3

After posting this, I found an answer. Google Sketchup has an option in the export to OBJ, “Triangulate all faces,” which, when enabled, doesn’t use any complex polygons. I also enabled “Export two-sided faces,” and that improved the results when viewing.

4

There’s also an OgreXML exporter that works pretty well. I have actually used it for a big project so I know it works good

5

<3 Ogre exporter :slight_smile:

6
“Export two-sided faces,” and that improved the results when viewing.


As an alternative, you can turn off face culling for the model. Should yield the same results :

[java]yourModel.getMaterial().getAdditionalRenderState().setFaceCullMode(FaceCullMode.Off);[/java]
7

Excellent, thanks for all the help, folks. Sounds like I need to stare the Ogre in face. :wink: