Problem with Blendmode.alpha with .obj object

Troubleshooting import-assets
1

I have some problem loading a .obj tree model. The model have an .obj, an .mtl file and all the textures in the same folder.
When I load the object without assigning to it any material, it have his textures on it but the leaves have black where there is supposed to be nothing but transparency:

There is my code when I added the default material:
and this is what happen

It’s not my model and it’s not only one texture so I don’t know how to put the Blendmode.alpha on the material of my object.

If anyone have an idea of what I can do help me please :slight_smile:

-jojolepro

2

It’s hard to tell what’s going on with those tiny little images and clicking on them didn’t help either.

I’m surprised more people don’t just use imgur.com for image hosting.

Is your issue a code issue that you just don’t know how to set a material?

3

My problem is that when I load directly the object with assetManager.loadModel(“path.obj”); it loads the model and the textures correctly but the leaves on the tree are black when there is supposed to be transparency so all over the tree there is black squares. I thinks the problem is the .obj or .mtl transparency is not correctly loaded or displayed

4

http://hub.jmonkeyengine.org/javadoc/com/jme3/scene/SceneGraphVisitorAdapter.html
http://hub.jmonkeyengine.org/javadoc/com/jme3/scene/Spatial.html#depthFirstTraversal(com.jme3.scene.SceneGraphVisitor)
http://hub.jmonkeyengine.org/javadoc/com/jme3/material/Material.html#getAdditionalRenderState()
http://hub.jmonkeyengine.org/javadoc/com/jme3/material/RenderState.html#setBlendMode(com.jme3.material.RenderState.BlendMode)

…or probably the tutorials on some level.

5

Thanks but I think it didn’t resolve the problem because I can’t access the Material from my Spatial and I can’t set a new one because it will erase the old one with all the textures so I think I can’t do material.getAdditionalRenderState() because I just don’t have access.

Old code:
tree = lifer.getAssetManager().loadModel(“EA02_Aesculus_glabra_Ohio_Buckeye_OBJ/EA02a.obj”);
tree.rotate(-90, 0, 0);
//Material matTree = new Material(lifer.getAssetManager(), “Common/MatDefs/Light/Lighting.j3md”);
//Material matTree = new Material(lifer.getAssetManager(),“EA02_Aesculus_glabra_Ohio_Buckeye_OBJ/EA02a.mtl”);
//mat1.setTexture(“m_ColorMap”, lifer.getAssetManager().loadTexture(“Models/warriorgirl300pxtall.png”));

    //matTree.getAdditionalRenderState().setBlendMode(BlendMode.Alpha);
    tree.setQueueBucket(Bucket.Transparent);
    //tree.setMaterial(matTree);
    DirectionalLight light = new DirectionalLight();
    lifer.getRootNode().addLight(light);

new code:
tree = lifer.getAssetManager().loadModel(“EA02_Aesculus_glabra_Ohio_Buckeye_OBJ/EA02a.obj”);
tree.rotate(-90, 0, 0);
SceneGraphVisitorAdapter sgva = new SceneGraphVisitorAdapter();
tree.depthFirstTraversal(sgva);
NO_MATERIAL_ACCESS.getAdditionalRenderState();
renderState.setBlendMode…
//Material matTree = new Material(lifer.getAssetManager(), “Common/MatDefs/Light/Lighting.j3md”);
//Material matTree = new Material(lifer.getAssetManager(),“EA02_Aesculus_glabra_Ohio_Buckeye_OBJ/EA02a.mtl”);
//mat1.setTexture(“m_ColorMap”, lifer.getAssetManager().loadTexture(“Models/warriorgirl300pxtall.png”));

    //matTree.getAdditionalRenderState().setBlendMode(BlendMode.Alpha);
    tree.setQueueBucket(Bucket.Transparent);
    //tree.setMaterial(matTree);
    DirectionalLight light = new DirectionalLight();
    lifer.getRootNode().addLight(light);

Did I miss something?
sorry if I’m a noob

-jojolepro

6
@jojolepro said: Thanks but I think it didn't resolve the problem because I can't access the Material from my Spatial and I can't set a new one because it will erase the old one with all the textures so I think I can't do material.getAdditionalRenderState() because I just don't have access.

Old code:
tree = lifer.getAssetManager().loadModel(“EA02_Aesculus_glabra_Ohio_Buckeye_OBJ/EA02a.obj”);
tree.rotate(-90, 0, 0);
//Material matTree = new Material(lifer.getAssetManager(), “Common/MatDefs/Light/Lighting.j3md”);
//Material matTree = new Material(lifer.getAssetManager(),“EA02_Aesculus_glabra_Ohio_Buckeye_OBJ/EA02a.mtl”);
//mat1.setTexture(“m_ColorMap”, lifer.getAssetManager().loadTexture(“Models/warriorgirl300pxtall.png”));

    //matTree.getAdditionalRenderState().setBlendMode(BlendMode.Alpha);
    tree.setQueueBucket(Bucket.Transparent);
    //tree.setMaterial(matTree);
    DirectionalLight light = new DirectionalLight();
    lifer.getRootNode().addLight(light);

new code:
tree = lifer.getAssetManager().loadModel(“EA02_Aesculus_glabra_Ohio_Buckeye_OBJ/EA02a.obj”);
tree.rotate(-90, 0, 0);
SceneGraphVisitorAdapter sgva = new SceneGraphVisitorAdapter();
tree.depthFirstTraversal(sgva);
NO_MATERIAL_ACCESS.getAdditionalRenderState();
renderState.setBlendMode…
//Material matTree = new Material(lifer.getAssetManager(), “Common/MatDefs/Light/Lighting.j3md”);
//Material matTree = new Material(lifer.getAssetManager(),“EA02_Aesculus_glabra_Ohio_Buckeye_OBJ/EA02a.mtl”);
//mat1.setTexture(“m_ColorMap”, lifer.getAssetManager().loadTexture(“Models/warriorgirl300pxtall.png”));

    //matTree.getAdditionalRenderState().setBlendMode(BlendMode.Alpha);
    tree.setQueueBucket(Bucket.Transparent);
    //tree.setMaterial(matTree);
    DirectionalLight light = new DirectionalLight();
    lifer.getRootNode().addLight(light);

Did I miss something?
sorry if I’m a noob

-jojolepro

The scene graph visitor adapter is designed to be EXTENDED. I thought that would kind of be obvious since it doesn’t actually do anything on its own.

So, try to figure out from that hint… or search the forum for SceneGraphVisitorAdapter for probably a dozen examples where it has been pasted in response to someone else.

Also:

7

Thank you! I’m a little noob sometime when I’m tired :slight_smile:
THanks for all!

-jojolepro

I will post the final result for other people if they get the same problem probably tomorow or in 2 days when I get free time.