Egon, thanks for prompt response.
Now everything is clear.

Can some explain what the difference between this options? Because the documentation is not clear how the ellipse will be transformed when performing collision detection with ELLIPSOID_TRANSFORMED options.

Thanks a lot.
I will continue to learn the basics.

If I understand correctly this code translate model to the origin and set rotation pivot and center to the origin. Is it right? And then I must scale model as I need?


InputStream objStream = mContext.getResources().openRawResource(R.raw.test_obj);
Object3D[] loadRes = Loader.loadOBJ(objStream, null, 1);

cube = loadRes[0];

float[] bb = cube.getMesh().getBoundingBox();
cube.translate(-(bb[0] + ((bb[1] - bb[0]) / 2)),
-(bb[2] + ((bb[3] - bb[2]) / 2)), -(bb[4] + ((bb[5] - bb[4]) / 2)));
cube.translateMesh();
cube.setTranslationMatrix(new Matrix());

cube.build();

cube.setCenter(SimpleVector.ORIGIN);
cube.setRotationPivot(SimpleVector.ORIGIN);

cube.scale(0.05f);

world.addObject(cube);


Egon, thank you very much.
By selecting I found the correct scale. When I load model it is 0.001f and after build I scale it with parameter 20.
But it is not clear if I load model with 0.02f scale and after build I do not scale I do not see it again.
What different between this approaches?

Egon, thank you for reply.
I am trying to scale, translate the object but still I do not see it. I'm a newbie in 3D programming and probably not fully understand all the methods of working with 3D objects.
Can you help me to determine what kind of transformation I must do that the object became visible.

Hi all. I have some problem with displaying obj model.
Here code of my renderer class:

package com.amulet_it.openglexample;

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

import android.content.Context;
import android.graphics.Color;
import android.graphics.PointF;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.widget.Toast;

import com.threed.jpct.Camera;
import com.threed.jpct.FrameBuffer;
import com.threed.jpct.Interact2D;
import com.threed.jpct.Light;
import com.threed.jpct.Loader;
import com.threed.jpct.Matrix;
import com.threed.jpct.Object3D;
import com.threed.jpct.Primitives;
import com.threed.jpct.SimpleVector;
import com.threed.jpct.Texture;
import com.threed.jpct.TextureManager;
import com.threed.jpct.World;

import java.io.InputStream;
import java.util.HashMap;

public class MyRenderer implements GLSurfaceView.Renderer {

    private Context mContext = null;

    private FrameBuffer fb = null;
    private World world = null;
    private Camera cam = null;

    public MyRenderer(Context context) {
        mContext = context;
    }

    @Override
    public void onSurfaceCreated(GL10 unused, EGLConfig config) {

    }

    @Override
    public void onSurfaceChanged(GL10 unused, int width, int height) {

        if ( fb != null ) {
            fb.dispose();
        }

        fb = new FrameBuffer(width, height);

        world = new World();
        cam = world.getCamera();

        InputStream objStream = mContext.getResources().openRawResource(R.raw.test_obj);
        Object3D[] loadRes = Loader.loadOBJ(objStream, null, 3);

        Object3D cube = loadRes[0];
        cube.setCollisionMode(Object3D.COLLISION_CHECK_OTHERS | Object3D.COLLISION_CHECK_SELF);
        cube.build();

        world.addObject(cube);

        Light light = new Light(world);
        light.setPosition(new SimpleVector(0, -80, 0));
        light.setIntensity(140, 120, 120);
        light.setAttenuation(-1);

        world.setAmbientLight(20, 20, 20);

        cam.moveCamera(Camera.CAMERA_MOVEOUT, 200);
        cam.moveCamera(Camera.CAMERA_MOVEUP, 200);
        cam.lookAt(cube.getTransformedCenter());

    }

    @Override
    public void onDrawFrame(GL10 unused) {

        fb.clear(Color.RED);
        world.renderScene(fb);
        world.draw(fb);
        fb.display();

   }
}

Obj file in attachment as test.txt.
The main problem i'm don't see loaded object on the scene.
Can some help me please?