I managed to make a group of objects that move together. Now I need objects to change their texture when clicked. I ran into a problem where I can't create textures from filenames. Below is a minimal code example (edited from one of the samples on this site). The line  Texture texture = new Texture("filename.jpg");  gives compilation error "The constructor Texture(String) is undefined". However, there is such  a constructor according to this http://www.jpct.net/doc/com/threed/jpct/Texture.html#Texture(java.lang.String).
I'm trying to figure out what is going wrong, any help is appreciated. Thank you.
package com.example.mytest;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collections;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.opengles.GL10;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.MotionEvent;

import com.threed.jpct.Camera;
import com.threed.jpct.FrameBuffer;
import com.threed.jpct.Light;
import com.threed.jpct.Logger;
import com.threed.jpct.Object3D;
import com.threed.jpct.PolygonManager;
import com.threed.jpct.Primitives;
import com.threed.jpct.RGBColor;
import com.threed.jpct.SimpleVector;
import com.threed.jpct.Texture;
import com.threed.jpct.TextureManager;
import com.threed.jpct.World;
import com.threed.jpct.util.BitmapHelper;
import com.threed.jpct.util.MemoryHelper;
import com.threed.jpct.Interact2D;

public class MainActivity extends Activity {

// Used to handle pause and resume...
private static MainActivity master = null;

private GLSurfaceView mGLView;
private MyRenderer renderer = null;

private FrameBuffer fb = null;
private World world = null;
private RGBColor back = new RGBColor(50, 50, 100);
private Camera cam = null;
private float camRotateX = (float)Math.PI/8;
private Light sun = null;
protected void onCreate(Bundle savedInstanceState) {

Logger.log("onCreate");

if (master != null) {
copy(master);
}
super.onCreate(savedInstanceState);
mGLView = new GLSurfaceView(getApplication());

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);

mGLView.setEGLConfigChooser(new GLSurfaceView.EGLConfigChooser() {
public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) {
// Ensure that we get a 16bit framebuffer. Otherwise, we'll fall
// back to Pixelflinger on some device (read: Samsung I7500)
int[] attributes = new int[] { EGL10.EGL_DEPTH_SIZE, 16, EGL10.EGL_NONE };
EGLConfig[] configs = new EGLConfig[1];
int[] result = new int[1];
egl.eglChooseConfig(display, attributes, configs, 1, result);
return configs[0];
}
});

renderer = new MyRenderer();
mGLView.setRenderer(renderer);
setContentView(mGLView);
}

@Override
protected void onPause() {
super.onPause();
mGLView.onPause();
}

@Override
protected void onResume() {
super.onResume();
mGLView.onResume();
}

@Override
protected void onStop() {
super.onStop();
}

private void copy(Object src) {
try {
Logger.log("Copying data from master Activity!");
Field[] fs = src.getClass().getDeclaredFields();
for (Field f : fs) {
f.setAccessible(true);
f.set(this, f.get(src));
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}

protected boolean isFullscreenOpaque() {
return true;
}

class MyRenderer implements GLSurfaceView.Renderer {
public MyRenderer() {
}

public void onSurfaceChanged(GL10 gl, int w, int h) {
if (fb != null) {
fb.dispose();
}
fb = new FrameBuffer(gl, w, h);

if (master == null) {

world = new World();
world.setAmbientLight(20, 20, 20);

sun = new Light(world);
sun.setIntensity(250, 250, 250);
Texture texture = new Texture("filename.jpg");
TextureManager.getInstance().addTexture("myTexture", texture);
cam = world.getCamera();
cam.rotateCameraX(camRotateX);
cam.moveCamera(Camera.CAMERA_MOVEOUT, 50);
SimpleVector origin = new SimpleVector(0f, 0f, 0f);
cam.lookAt(origin);

SimpleVector sv = new SimpleVector();
sv.set(origin);
sv.y -= 100;
sv.z -= 100;
sun.setPosition(sv);

System.runFinalization();
System.gc();
MemoryHelper.compact();
}

if (master == null) {
Logger.log("Saving master Activity!");
master = MainActivity.this;
}
}


public void onSurfaceCreated(GL10 gl, EGLConfig config) {
}

public void onDrawFrame(GL10 gl) {
fb.clear(back);
world.renderScene(fb);
world.draw(fb);
fb.display();
}
}
}


Actually, I don't have working code yet - as of now I'm designing the general structure. But I wasn't planning to load from file, instead I want to use getCube to build objects piece by piece (all faces should be square). I will try the trick of making face objects children of a pivot dummy. Thanks for your help.

I will have 3 objects, 30 to 50 faces each. If there is a way to have one object per face, that would be very convenient. However, the object as a whole should be rotatable, that is if the users sweeps across the object, all faces should move like if they comprised a surface of a rigid body. Is it still possible to accomplish this?

Hello,

I have a complex object comprised of multiple square faces, where each face consists of two triangles. When the user touches a face, I want it to change its texture. How can I identify which face has been touched, and how can I change the texture on that face?
Thanks in advance for any help.