protected void CreateScene(GLAutoDrawable arg0) {
    int iWidth = m_iWidth;
    int iHeight = m_iHeight;

    int iDepth = m_kImageA.nDims == 3 ? m_kImageA.extents[2] : 1;
    m_kHistogramOutput = CreateRenderTarget(arg0, "Histogram2D", iWidth, iHeight);
    m_kHistogramOutputB = CreateRenderTarget(arg0, "Histogram2DB", iWidth, iHeight);
    m_kEntropyOut = CreateRenderTarget(arg0, "EntropyOut", 1, 1);

    if (CreateImageMesh(m_kImageA.extents[0], m_kImageA.extents[1], iDepth) == null) {
      CreateImageMesh(m_kImageA.extents[0], m_kImageA.extents[1], 1);
      m_iRenderLoops = iDepth;
      System.err.println("Switching to 2.5D");
    }
    m_kImagePointsDual.AttachEffect(m_kImageEffectDual);
    m_kImageEffectDual.SetImageSize(m_kImageA.extents[0], m_kImageA.extents[1], iDepth);

    CreateHistogramMesh(m_iWidth, m_iHeight);
    m_akCollapse2D =
        new VolumeHistogramEffect(m_kHistogramOutput.GetTarget(0), VolumeHistogramEffect.NONE);
    m_akCollapseColumns =
        new VolumeHistogramEffect(
            m_kHistogramOutput.GetTarget(0), VolumeHistogramEffect.COLLAPSE_COLUMNS);
    m_akCollapseRows =
        new VolumeHistogramEffect(
            m_kHistogramOutput.GetTarget(0), VolumeHistogramEffect.COLLAPSE_ROWS);

    m_kHistogramPoints2D.AttachEffect(m_akCollapse2D);
    AlphaState pkAState = m_akCollapse2D.GetBlending(0);
    pkAState.BlendEnabled = true;
    pkAState.SrcBlend = AlphaState.SrcBlendMode.SBF_ONE;
    pkAState.DstBlend = AlphaState.DstBlendMode.DBF_ONE;

    m_kHistogramPoints2D.AttachEffect(m_akCollapseColumns);
    pkAState = m_akCollapseColumns.GetBlending(0);
    pkAState.BlendEnabled = true;
    pkAState.SrcBlend = AlphaState.SrcBlendMode.SBF_ONE;
    pkAState.DstBlend = AlphaState.DstBlendMode.DBF_ONE;

    m_kHistogramPoints2D.AttachEffect(m_akCollapseRows);
    pkAState = m_akCollapseRows.GetBlending(0);
    pkAState.BlendEnabled = true;
    pkAState.SrcBlend = AlphaState.SrcBlendMode.SBF_ONE;
    pkAState.DstBlend = AlphaState.DstBlendMode.DBF_ONE;

    double dSize = m_kImageA.dataSize;
    m_akImageReduceEntropy = new ImageReduceEffect(m_kHistogramOutputB.GetTarget(0), dSize);
    m_kEntropyPoints2D.AttachEffect(m_akImageReduceEntropy);
    /*
          m_kImageLineMinPass2a = new LineMinimizationEffect( m_kBracketOut.GetTarget(0), m_kEntropyOut.GetTarget(0), m_fMinDist, (float)dSize, m_kImageA.nDims  );
          m_kImageLineMinDual.SetImageSize( m_kImageA.extents[0],m_kImageA.extents[1],iDepth );
    */
  }
  protected void CreateBracketMesh() {
    // System.err.println( iWidth + " " + iHeight + " " + iDepth );
    Attributes kAttributes = new Attributes();
    kAttributes.SetPChannels(3);

    int iVQuantity = 3;
    VertexBuffer pkVB = new VertexBuffer(kAttributes, iVQuantity);

    // generate geometry

    float[] afChannels = pkVB.GetData();
    int iIndex = 0;
    afChannels[iIndex++] = 0;
    afChannels[iIndex++] = -1.0f;
    afChannels[iIndex++] = 0.0f;
    afChannels[iIndex++] = 0;
    afChannels[iIndex++] = 0.0f;
    afChannels[iIndex++] = 0.5f;
    afChannels[iIndex++] = 0;
    afChannels[iIndex++] = 0.95f;
    afChannels[iIndex++] = 1.0f;

    m_kBracketPoints = new Polypoint(pkVB);
    AlphaState kAlpha = new AlphaState();
    kAlpha.BlendEnabled = true;
    kAlpha.SrcBlend = AlphaState.SrcBlendMode.SBF_ONE;
    kAlpha.DstBlend = AlphaState.DstBlendMode.DBF_ONE;
    m_kBracketPoints.AttachGlobalState(kAlpha);
    m_kBracketPoints.UpdateGS();
    m_kBracketPoints.UpdateRS();
  }
  protected void CreateHistogramMesh(int iWidth, int iHeight) {
    Attributes kAttributes = new Attributes();
    kAttributes.SetPChannels(3);

    int iVQuantity = iWidth * iHeight;
    VertexBuffer pkVB = new VertexBuffer(kAttributes, iVQuantity);

    // generate geometry
    float fInv0 = 1.0f / (iWidth);
    float fInv1 = 1.0f / (iHeight);
    float fU, fV;
    int i0, i1;

    float[] afChannels = pkVB.GetData();
    int iIndex = 0;

    for (i1 = 0; i1 < iHeight; i1++) {
      fV = i1 * fInv1;
      for (i0 = 0; i0 < iWidth; i0++) {
        fU = i0 * fInv0;
        afChannels[iIndex++] = ((2.0f * fU - 1.0f));
        afChannels[iIndex++] = ((2.0f * fV - 1.0f));
        afChannels[iIndex++] = 0f;

        // System.err.println( ((2.0f*fU-1.0f)) + " " + ((2.0f*fV-1.0f)));
      }
    }
    m_kHistogramPoints2D = new Polypoint(pkVB);
    m_kEntropyPoints2D = new Polypoint(pkVB);

    AlphaState kAlpha = new AlphaState();
    kAlpha.BlendEnabled = true;
    kAlpha.SrcBlend = AlphaState.SrcBlendMode.SBF_ONE;
    kAlpha.DstBlend = AlphaState.DstBlendMode.DBF_ONE;

    m_kHistogramPoints2D.AttachGlobalState(kAlpha);
    m_kHistogramPoints2D.UpdateGS();
    m_kHistogramPoints2D.UpdateRS();

    m_kEntropyPoints2D.AttachGlobalState(kAlpha);
    m_kEntropyPoints2D.UpdateGS();
    m_kEntropyPoints2D.UpdateRS();
  }
  protected ResourceIdentifier CreateImageMesh(int iWidth, int iHeight, int iDepth) {
    // System.err.println( iWidth + " " + iHeight + " " + iDepth );
    Attributes kAttributes = new Attributes();
    kAttributes.SetPChannels(3);

    int iVQuantity = iWidth * iHeight * iDepth;
    VertexBuffer pkVB = new VertexBuffer(kAttributes, iVQuantity);

    // generate geometry
    float fInv0 = 1.0f / (iWidth - 1.0f);
    float fInv1 = 1.0f / (iHeight - 1.0f);
    float fInv2 = 1.0f / (iDepth);
    float fU, fV, fW;
    int i0, i1, i2;

    float[] afChannels = pkVB.GetData();
    int iIndex = 0;

    for (i2 = 0; i2 < iDepth; i2++) {
      fW = i2 * fInv2;
      for (i1 = 0; i1 < iHeight; i1++) {
        fV = i1 * fInv1;
        for (i0 = 0; i0 < iWidth; i0++) {
          fU = i0 * fInv0;
          afChannels[iIndex++] = ((2.0f * fU - 1.0f));
          afChannels[iIndex++] = ((2.0f * fV - 1.0f));
          afChannels[iIndex++] = ((2.0f * fW - 1.0f));
        }
      }
    }

    m_kImagePointsDual = new Polypoint(pkVB);
    m_kAlpha = new AlphaState();
    m_kAlpha.BlendEnabled = true;
    m_kAlpha.SrcBlend = AlphaState.SrcBlendMode.SBF_ONE;
    m_kAlpha.DstBlend = AlphaState.DstBlendMode.DBF_ONE;
    m_kImagePointsDual.AttachGlobalState(m_kAlpha);
    m_kImagePointsDual.UpdateGS();
    m_kImagePointsDual.UpdateRS();

    return m_pkRenderer.LoadVBuffer(pkVB.GetAttributes(), pkVB.GetAttributes(), pkVB);
  }