Unload an OBJ model's texture

Troubleshooting
1

I have a textured mesh (OBJ + MTL file combo) that I load like so:

Spatial spatial = assetManager.loadModel("path/to/some/model.obj");
rootNode.attachChild(spatial);

I’d like to present this model in two formats: textured & untextured. By “untextured”, perhaps I mean unshaded, but what I’m looking for is a way to render the model as just a “mesh skeleton” (essentially just as vertices and connected edges). Is this possible to do?

2

mat.getAdditionalRenderState().setWireframe(true);

You need to get the material for this. So I think you’ll need to cast it to a geometry which has a getMaterial() method, which may require some searching on the forum but it’s pretty well documented :stuck_out_tongue:

3

Thanks @JESTERRRRRR, but isn’t Geometry a Spatial subclass? If so, why couldn’t I just do:

Geometry geo = (Geometry)spatial;

Or am I missing something? Thanks again!

4

I remember having done this once and finding it didn’t work but try it first by all means.

This is why. I think for me I just ended up doing spatial.getChild(0) and casting that to Geometry, not sure if yours will be the same case.

5

Or rather than casting randomly about your section of the scene graph, you can hit all of the geometry under that Spatial (or the spatial itself) pretty easily:
http://javadoc.jmonkeyengine.org/com/jme3/scene/SceneGraphVisitorAdapter.html
http://javadoc.jmonkeyengine.org/com/jme3/scene/Spatial.html#depthFirstTraversal-com.jme3.scene.SceneGraphVisitor-

6

Never seen that before… what a spoilsport

7

Thanks @pspeed and @JESTERRRRRR but I guess I’m not seeing the forest through the trees here. I’m loading a single model (OBJ) via assetManager.loadModel(String)…

Wouldn’t that mean the resulting spatial will always be a Geometry?!? How could I load a model and have that be a Node with children?

8

Quite often. For example, if your model has more than one texture then it is probably two geometries under a node. If it has more than one mesh then it is two geometries under a node.

The case where loading a model results in a single Geometry is the rarer case.