java.lang.RuntimeException: Model must have texture UVs or vertex Colors

[jehadmashhour]

I'm trying to show my 3d model by using your library but the model doesn't show , always i get error is java.lang.RuntimeException: Model must have texture UVs or vertex Colors , i have tried the solutions here https://github.com/smart-fun/smartGL/issues/12 but i still get the same error .

Some solutions i have tested : 1 - exporting the same model with blender with ticking the "Triangulate Faces" option . 2 - exporting the same model with MeshLab .

But to no avail.

earthblender.zip

[smart-fun]

Hello and thank you for using smartGL :)

I can see 2 compatibility issues between your object and the library:

• there are several objects in the file -> not handled by the library
• there is no texture (mapped image) and no colors on the object -> how the faces are supposed to be displayed if there are no properties at all ?

regarding the "multiple objects" in the file, I didn't know it was possible, and it could be a great improvement for the library. I'll keep the idea :) but it won't be fixed today.

regarding the "no property" issue, for the moment I have no idea what should be done. Display a fully white object ? The objects are supposed to have colors or picture.

Arnaud.

[smart-fun]

I had a deeper look to the problem.

• it was not really a problem for the multiple objects as all objects use different vertex and indexes
• when there is no texture and no colors on the vertex, there is now a way to set a default color to the object:

please upgrade to version 1.1.9 and if you look at the new documentation, I have added:

Note that if your Model does not have a texture but colors on each vertex, you'll have to use a specific "color" shader instead of the default one:

new RenderPassObject3D(RenderPassObject3D.ShaderType.SHADER_COLOR, true, true);

Also if there are no textures and no colors on vertex, you can specify a default color in the WavefrontModel.Builder using:

builder.setColor(0.5f, 0.3, 0.8f); // RGB

In the future I think I will merge all shaders and the model could have textures and/or colors and/or a default color.

Please tell me if your model loads correctly.

Also can I use your model in the sample app so that I have an example without a texture and without colors ?

thanks,

Arnaud.

[jehadmashhour]

Thanks for ur answer , there is no problem to use my 3d model and this's will be appreciated .

Yes now i understand why my 3d model doesn't work so that i went to the blender to generate UVs which means vt in the obj file .

To help developers : by using blender u can do that by doing these steps :

Minimal example to include texture coordinates / vt in OBJ format: File -> New Change from Object Mode to Edit Mode Click Shading / UVs from the upper left vertical aligned tabs Under UV Mapping, change from Unwrap to Cube Projection under Export to OBJ Conclusion: The key to include vt in OBJ is step 4. Step 4 is only available in Edit Mode.

Thanks for the new addition in the latest version that's really helpful .

The problem that i faced as a developer (not designer) is how to generate a 3d model with it's vertex colors , as u see my 3d model has a colors included as a materials , so how i can change them to be vertex colors , i still struggle with that to do it by using Blender or MeshLab , so plz if u have a hint (help) for a steps then this's will be appreciated ??

However , I find another solution to handle the colors of my materials to show them as a textures by using this way : 1 - Generate my 3d model by using Blender with including UVs (vt) as the steps i mentioned them at the top .

2 - Handle the colors as a textures by doing this code : Texture Red = createTexture(Color.parseColor("#D11500"), Color.parseColor("#D11500")); Texture White = createTexture(Color.parseColor("#D1D1D1"), Color.parseColor("#D1D1D1")); Texture LightBrown = createTexture(Color.parseColor("#7B513E"), Color.parseColor("#7B513E")); Texture Green = createTexture(Color.parseColor("#2A821E"), Color.parseColor("#2A821E")); Texture Brown = createTexture(Color.parseColor("#492F1E"), Color.parseColor("#492F1E")); Texture DarkGreen = createTexture(Color.parseColor("#216519"), Color.parseColor("#216519")); Texture Blue = createTexture(Color.parseColor("#4F96A5"), Color.parseColor("#4F96A5")); Texture Snow = createTexture(Color.parseColor("#BDBDBD"), Color.parseColor("#BDBDBD"));

private Texture createTexture(int colorBg, int colorDetails) { int tx = 3; Bitmap bitmap = Bitmap.createBitmap(tx + 1, tx + 1, Bitmap.Config.ARGB_8888); bitmap.eraseColor(colorBg); // Закрашиваем цветом bitmap.setPixel(0, 0, colorDetails); bitmap.setPixel(0, tx, colorDetails); bitmap.setPixel(tx, 0, colorDetails); bitmap.setPixel(tx, tx, colorDetails); Texture texture = new Texture(tx, tx, bitmap); return texture; }

3 - load it by the following method code :

private Object3D loadEarth(@NonNull Context context, Texture Red, Texture White, Texture LightBrown , Texture Green, Texture Brown, Texture DarkGreen, Texture Blue, Texture Snow) { WavefrontModel model = new WavefrontModel.Builder(context, R.raw.earthblender) .optimize(true) .addTexture("Red", Red) .addTexture("White", White) .addTexture("LightBrown", LightBrown) .addTexture("Green", Green) .addTexture("Brown", Brown) .addTexture("DarkGreen", DarkGreen) .addTexture("Blue", Blue) .addTexture("Snow", Snow) .create(); Object3D object3D = model.toObject3D(); object3D.setScale(10f, 10f, 10f); object3D.setPos(0, 0, -50); return object3D; }

The result as a colors showing as a textures :

[smart-fun]

I have made a new build 1.2.0 with a new shader (SHADER_COLOR_LIGHTS), and your planet has been added to the sample app. So even without textures it is possible to display an object and define a color.

give a try to the sample app ;)

Arnaud.