Changing texture of Blender model programmatically [resolved]

Troubleshooting import-assets
1

Hi everybody,



following situation: I’ve got a model (exported from Blender as model.mesh.xml, model.material and texture.jpg) that I want to use more than once in the game but with different textures.



Now if I simply do something like this



[java]

Spatial model = assetManager.loadModel(“Models/model/model.mesh.xml”);

Material m = new Material(assetManager, “Common/MatDefs/Misc/Unshaded.j3md”);

m.setTexture(“ColorMap”, assetManager.loadTexture(“Models/model/other-texture.jpg”));

model.setMaterial(m);

[/java]



apparently the UV-mapping (and probably shading instructions etc) are lost.



Is there a way to change only the texture used in the material from inside jMonkey? Thanks for your help!

2

Get the material from the model. Clone it, then change the texture, and set that material to the model.

3

Sorry, forgot to mention this in the original post:



When I do this and try to set the ColorMap (like in the example above), it says the material has no such parameter.

4

The way I did this was to have several materials with the different textures and swap the materials on the geometry… I did have multiple on screen at once all potentially changing though.

5

That’s essentially what wezrule suggested…but it still doesn’t address my issue :wink:

6
@lunikon said:
apparently the UV-mapping (and probably shading instructions etc) are lost.

No. uv coordinates are stored on the mesh level.

You probably have to flip your texture. load it with a texture key to do it
[java]
TextureKey key = new TextureKey("Models/model/other-texture.jpg", true);
m.setTexture("ColorMap", assetManager.loadTexture(key));
[/java]
The boolean argument in the TextureKey constructor is for flipping.
1 Like
7

The loader uses Common/MatDefs/Light/Lighting.j3md, not Common/MatDefs/Misc/Unshaded.j3md. ColorMap is only available in Unshaded.

Use the DiffuseMap parameter instead :slight_smile:



See https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:advanced:materials_overview for details

1 Like
8

Thanks a lot @nehon



That fixed the UV issue. Concerning the other material properties: A short debugging session (shame on me for not trying this earlier) revealed that the parameter simply isn’t called “ColorMap” but “DiffuseMap”, so



[java]m.setTexture(“DiffuseMap”, assetManager.loadTexture(key));[/java]



did the trick.

9

@rylius was faster :slight_smile:

10

Yeeh, the texture parameter name is different for unshaded and lighting materials.