Magic Cube

  private final float[][] mTouchBorders;

///////////////////////////////////////////////////////////////////////////////////////////////////

  Movement8(Static3D[] rotAxis,float[][] cuts, boolean[][] rotatable, int numLayers)

    {

    super(rotAxis, FACE_AXIS, DIST3D, DIST2D);

    float scale = (3*SQ2/4)/numLayers; // 3*SQ2/4 is 1/cos(dihedral-90)

    mTouchBorders = computeBorders(scale,cuts,rotatable);

    }

// We have either one of the four faces (1,3,4,6) which, when the retAxis are cast onto it, they

// point the right way (and so the triangle then spans from offset=-SQ3/6 to offset=+SQ3/3 with

// midpoint at SQ3/12) or one of the other face when the cast rotAxis are the wrong way round (and

// the triangle spans then from 0 to SQ3/2 with midpoint at SQ3/4).

//

// This is only true if the rotAxis connect the centers of opposing faces!

  int computeRowFromOffset(int face, int axisIndex, int numLayers, float offset)

    float off = ( face==1 || face==3 || face==4 || face==6 ) ? DIST2D/2 : -DIST2D/2;

    float[] borders = mTouchBorders[axisIndex];

    int len = borders.length;

    for(int i=0; i<len; i++)

      {

      if( offset+off<borders[i] ) return i;

      }

    return len;