i know what i am going to ask is already discussed sometimes but after going through all of them i can't found my complete answer so i am asking a new question when i tried integrating JPCT-ae with QCAR all goes well as expected, i got my modelview matrix from renderframe from jni and successfully transferred that in java to jpct model is shown perfectly as expected. but when i tried to pass this matrix to JPCT world camera my model disappear. my code:in onsurfacechanged:

world = new World();

`world.setAmbientLight(20, 20, 20);`

sun = new Light(world);

sun.setIntensity(250, 250, 250);

cube = Primitives.getCube(1);

cube.calcTextureWrapSpherical();

cube.strip();

cube.build();

world.addObject(cube);

cam = world.getCamera();

cam.moveCamera(Camera.CAMERA_MOVEOUT, 10);

cam.lookAt(cube.getTransformedCenter());

SimpleVector sv = new SimpleVector();

sv.set(cube.getTransformedCenter());

sv.y -= 100;

sv.z -= 100;

sun.setPosition(sv);MemoryHelper.compact();

and in ondraw:

com.threed.jpct.Matrix mResult = new com.threed.jpct.Matrix();`mResult.setDump(modelviewMatrix ); //modelviewMatrix i get from Qcar`

cube.setRotationMatrix(mResult);

cam.setBack(mResult);

fb.clear(back);

world.renderScene(fb);

world.draw(fb);fb.display();

after some research i found that QCAR uses a right-handed coordinate system meaning that the X positive goes right, the Y positive goes up and the Z positive comes out of screen but in JPCT coordinate system the X positive goes right, the Y positive goes down and the Z positive goes into the screen. Qcar coordinate system:

i know that matrix QCar is giving is a 4*4 matrix having 3*3 rotational values and translation vector . i am posting matrices to be more clear:

modelviewmatrix:

1.512537 -159.66255 -10.275316 0.0

`-89.86529 -1.1592013 4.7839375 0.0`

-8.619186 10.179538 -159.44305 0.059.182976 93.205956 437.2832 1.0

modelviewmatrix after reverse using cam.setBack(modelviewmatrix.invert(modelviewmatrix)) :

5.9083453E-5 -0.01109448 -3.3668696E-4 0.0

`0.0040540528 -3.8752193E-4 0.0047518034 0.0`

-0.004756433 -4.6811014E-4 0.0040459237 0.00.7533285 0.4116795 2.7063704 0.9999999

if i remove 13,14 and 15 matrix element assuming 3*3 rotation matrix...model is rotated properly but translation(in and out movement of image) is not there finally i dont know what changes translation vector is needed. so please suggest me what i am missing here?

hi,

i have question on this project. How to change image target(stone and chips or tarmac) in this project. I can't change the stonesAndChips whatever i do. May you help me ?