I am using a merge-call I think.

    private Object3D loadModel(String filename, float scale) {
        Loader.setVertexOptimization(false);
        Object3D[] model = Loader.load3DS(filename, scale);

        Object3D o3d = new Object3D(0);

        Object3D temp = null;

        for (int i = 0; i < model.length; i++) {
            temp = model[i];
            temp.setCenter(SimpleVector.ORIGIN);
            temp.rotateX((float)( -.5*Math.PI));
            temp.rotateMesh();
            temp.setRotationMatrix(new Matrix());
            o3d = Object3D.mergeObjects(o3d, temp);
            o3d.build();
        }
        return o3d;
    }

I think I can figure the rest out myself. Thank you very much for your help!

I have made a terrain mesh as one object and added one water-plane as another object. I want the water to be transparent.

How it turns out to be:
http://i.troll.ws/8e76be95.png

How I want it to be:
http://i.troll.ws/3c3e930d.png

I tried using setTransparency, but when I put for example value 0 in, then the terrain also becomes transparent, and when I put value 255 in, nothing is transparent, except for the black spots I left on the map. I also tried setting useAlpha to true in Texture(java.awt.Image image, boolean useAlpha), but I didn't see any effect.

I don't know if I did something wrong in Blender or in jPCT. You can see all the settings (or most of) I used in the second screenshot.

Make sure that the export from blender exports them properly.

Thanks! This was the problem. It took me quite some time to figure out what I did wrong and how to fix it. I will explain what I did in short (for people with the same problem).

Initially, I tried to select an object, then in the material-tab (Properties Window), I applied a standard surface-material on it and then, in the texture-tab, select type: Image or Movie and load the desired image file. Then in the Mapping section, I took Coordinates: Global and Projection: Cube. But this when you export the 3ds model, the coordinates are not exported with it.

Fix Coordinates:
Set coordinates to UV and get to the UV-editor in edit mode. Select all faces of the object (press A), then go to mesh --> UV-unwrap --> unwrap. In the UV-editor, scale until you have a nice mapping. Make sure that you apply the scaling you did in object mode to editing mode: select in Object Mode, Object --> Apply --> Scale.

Fix Normals:
Go to view-->properties (or press N), then scroll down to Mesh Display and then under normals, click on the buttons to show the normals of the faces and the normals of the vertices. Then, fix the normals that are incorrect by ctrl-f --> flip normals.

Fix Transparancy:
Continue here: http://www.jpct.net/forum2/index.php/topic,3203.0.html

Hello, I am new to jPCT. I have some experience with LWJGL and JOGL though.

I am trying to load a house with an animated door, created with Blender into a world.

Rendered with Blender:


When imported by the object-loader:


I think something goes wrong with the back-face culling and the coordinates of the textures, and I'm not sure what to do with setEnvmapped() and  setEnvmapMode(). Furthermore, when I try to enable blending (thing.setBlending(true);), I get an ArrayIndexOutOfBoundsException at the world.draw(buffer); line.

import com.threed.jpct.*;
import javax.swing.*;


public class HouseTest {

    private String[] textures = {"door", "wall", "roof", "tile2"};
    private String thingName = "hous1";
    private int thingScale = 1;
    private World world;
    private FrameBuffer buffer;
    private Object3D thing;
    private JFrame frame;
    private int an = 2;//do a walk animation
    private float ind = 0;
    public int height = 600;
    public int width = 800;

    public static void main(String[] args) throws Exception {
        new HouseTest().loop();
    }

    public HouseTest() throws Exception {
        frame = new JFrame("Blender Model Loading");
        frame.setSize(width, height);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        world = new World();
        world.setAmbientLight(150, 150, 150);
        for (int i = 0; i < textures.length; ++i) {
            TextureManager.getInstance().addTexture(textures[i] + ".jpg", new Texture("res/" + textures[i] + ".jpg"));
        }

        thing = loadModel("res/" + thingName + ".3ds", thingScale);

        Animation anim = new Animation(4);
        anim.createSubSequence("idle");
        anim.addKeyFrame(thing.getMesh());
       
        anim.createSubSequence("house");
        anim.addKeyFrame(loadModel("res/" + "hous1.3ds", 1).getMesh());
        anim.addKeyFrame(loadModel("res/" + "hous2.3ds", 1).getMesh());
        anim.addKeyFrame(loadModel("res/" + "hous3.3ds", 1).getMesh());
 
        thing.setAnimationSequence(anim);
        world.addObject(thing);     
        world.getCamera().setPosition(0, 0, -20);
        world.getCamera().lookAt(thing.getTransformedCenter());

        thing.setEnvmapped(true);
        thing.setEnvmapMode(false);
    }

    private void loop() throws Exception {
        buffer = new FrameBuffer(width, height, FrameBuffer.SAMPLINGMODE_NORMAL);

        while (frame.isShowing()) {
            doAnim(); 
            buffer.clear(java.awt.Color.BLUE);           
            world.renderScene(buffer);
         
            world.draw(buffer);
            buffer.update();
            buffer.display(frame.getGraphics());
            Thread.sleep(10);
        }
        buffer.disableRenderer(IRenderer.RENDERER_OPENGL);
        buffer.dispose();
        frame.dispose();
        System.exit(0);
    }

    private Object3D loadModel(String filename, float scale) {
        Loader.setVertexOptimization(false);
        Object3D[] model = Loader.load3DS(filename, scale);

        Object3D o3d = new Object3D(0);

        Object3D temp = null;

        for (int i = 0; i < model.length; i++) {
            temp = model[i];
            temp.setCenter(SimpleVector.ORIGIN);
            temp.rotateX((float)( -.5*Math.PI));
            temp.rotateMesh();
            temp.setRotationMatrix(new Matrix());
            o3d = Object3D.mergeObjects(o3d, temp);
            o3d.build();
        }
        return o3d;
    }
    public void doAnim() {
        {
            ind += 0.018f;
            if (ind > 1f) {
                ind -= 1f;
            }
        }
        thing.animate(ind, an);
    }
}

EDIT: Don't mind the door. I forgot the texture.