pieces should be right beneath the finger

hscgv_uebung_2/Grabber.cpp

@@ -79,9 +79,9 @@ Grabber::setPiece(SbVec3f position)
    // Schedule the idle sensor for the animation!
    // During the animation Gameboard::setPiece is called.
 
-   m_gameboard->setPiece(m_pickedUpTile->getChild(0));
-   m_pickedUpTile->getChild(0)->unref();
-   m_pickedUpTile->removeChild(0);
+   m_gameboard->setPiece(m_pickedUpTile->getChild(1));
+   m_pickedUpTile->getChild(1)->unref();
+   m_pickedUpTile->removeChild(1);
    // remember to drop down a piece
 //   m_mode = SET_PIECE;
 }
@@ -214,7 +214,7 @@ Grabber::initSceneGraph()
    movingGrabber->addChild(armGroup);
    SoTransform *armTrafo = new SoTransform;
    armTrafo->translation.setValue(.0,.0,4.0);
-   armTrafo->rotation.setValue(SbVec3f(0,0,1), 3*M_PI_4);
+   armTrafo->rotation.setValue(SbVec3f(0,0,1), M_PI);
    armGroup->addChild(armTrafo);
    SoCube *arm = new SoCube;
    arm->width = arm->height = 1.5;
@@ -228,7 +228,7 @@ Grabber::initSceneGraph()
    // translate elbow to top of shoulder + its own half height (=radius)
    // [all heigths of any SoObjects are measured from their midpoints]
    elbowTrafo->translation.setValue(.0,.0,arm->depth.getValue()/2+.75);
-   elbowTrafo->rotation.setValue(SbVec3f(0,1,0), M_PI_4);
+   elbowTrafo->rotation.setValue(SbVec3f(0,1,0), 0.);
    elbowGroup->addChild(elbowTrafo);
    SoCylinder *elbow = new SoCylinder;
    elbow->radius = 1.;
@@ -312,6 +312,9 @@ Grabber::initSceneGraph()
    // and lust but not leaster ;) - we need a place for the picked up tile
    m_pickedUpTile = new SoGroup;
    movingGrabber->addChild(m_pickedUpTile);
+   SoTransform *tileTrafo = new SoTransform;
+   tileTrafo->translation.setValue(.0,.625,-1.5);
+   m_pickedUpTile->addChild(tileTrafo);
 
    // build remaining parts of grabber
    return grabber;