Create cylinder with image on the top disk

Troubleshooting General Help
1

hi all

anyone knows how to create a cylinder with an image on the top ?

grazie

2

Why not just make a model in blender or something with the texture you want then import the model asset?

3

could u give me more code details please?

4

Well there’s not so much code as there is some modeling to do then follow some of the tutorials regarding importing assets.



How to import assets into a project: https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:beginner:hello_asset



As to how to make the actual asset that depends greatly on the application you choose (i.e. Blender, Maya, 3D Studio Max)

5

Do some texturing/material tutorials.



Create Cylinder.

Create Geometry using the cylinder mesh.

Create Material.

Set Texture to material.

Set material to Geometry.

6

I ve done but image is completely deformed

[java]

cylinderGeometry = new Geometry("money", cylinder);

material = new Material(assetManager, "Common/MatDefs/Light/Lighting.j3md");

material.setTexture("DiffuseMap", tex2);

material.setFloat("Shininess", 5f);

cylinderGeometry.setMaterial(material);

rootNode.attachChild(cylinderGeometry);



[/java]

7

Yes, because the texture coordinates are completely wrong for your goal. Create a model in Blender, adjust the uv coordinates INSIDE Blender so that the image sits the way you want it and then you can load everything using assetManger.loadModel(“file.blend”)

8

but not exists a simple instruction with jme3

i download blender but it’s hard to build a cylinder with an image ate the top

9

afraid not, as @Dodikles said, blender + UV’s is what you need. Create a cylinder, go into edit mode, go to the top view, select the top faces, click U, then unwrap from project view. That will give you UV’s for the top of a cylinder.

10

It is a simple instruction: import your model from blender with properly mapped texture coordinates for your texture.

You need to practice with some blender tutorials to understand how texture mapping works.

11

Theres a detailed explanation on how to create a proper model in blender at the bottom of the page that was linked by thecyberbob:

https://docs.google.com/fileview?id=0B9hhZie2D-fENDBlZDU5MzgtNzlkYi00YmQzLTliNTQtNzZhYTJhYjEzNWNk&hl=en

And no, there is still no JmeSystem.doWhatDilemboWants(), you still have to read the tutorials and docs. That seems to work for most people so I can’t really believe you ever tried it that way.

12

LoL :stuck_out_tongue: Dilembo is still the good ol’ troll :smiley:

13
normen said:
And no, there is still no JmeSystem.doWhatDilemboWants()

There's only a JmeSystem.doWhatMadJackWants() method, but it's broken beyond repair. ;)
14

lol i like dilembo :P, he seems to know how to annoy normen like no other :smiley:

15

never seen such a shitty tool as blender

16

Well ya get what ya pay for… Oh ya. Blender is free.

17

I have never seen such an incapable developer like dilembo xD Ah, no consultant… Best care not to consult this guy xD

18
19

I ran into this problem just today. And, I too, am not a fan of using modelling software, if I can avoid it. So, I wrote this:

public static Geometry setUVPlanaerProject(Geometry geometry, Vector3f projectionNormal) {
    VertexBuffer position = geometry.getMesh().getBuffer(VertexBuffer.Type.Position);
    VertexBuffer texcoord = geometry.getMesh().getBuffer(VertexBuffer.Type.TexCoord);

    // Calculate the transform vectors
    projectionNormal = projectionNormal.normalize();
    float b = 0.0f != projectionNormal.x ? projectionNormal.x : projectionNormal.z;
    float a = 0.0f != projectionNormal.y ? projectionNormal.y : projectionNormal.z;

    Vector3f uVect = new Vector3f(a, -b, 0).normalize();
    Vector3f vVect = projectionNormal.cross(uVect);

    for (int i = 0; i < position.getNumElements(); i++) {
        // Read from vertex buffer
        Vector3f vector = new Vector3f();
        vector.x = ((Float) position.getElementComponent(i, 0));
        vector.y = ((Float) position.getElementComponent(i, 1));
        vector.z = ((Float) position.getElementComponent(i, 2));
        vector = vector.normalize();
    
        // Calculate uv coordinates
        float u = uVect.dot(vector);
        float v = vVect.dot(vector);
    
        // Write to the uv coords the the Texcoord buffer.
        texcoord.setElementComponent(i, 0, u);
        texcoord.setElementComponent(i, 1, v);
    }

    return geometry;
}

Now I call this method for my cylinder geometry, and pass Vector3f.UNIT_Z, as the second argument.

Works like a charm! Enjoy!