Пример #1
0
  private double interpolate_value(
      final StructuredVolumeObject volume, final Vector3f vertex0, final Vector3f vertex1)
      throws KVSException {
    Buffer buf = volume.values();

    final int line_size = volume.nnodesPerLine();
    final int slice_size = volume.nnodesPerSlice();

    final float value0 = this.substitute_plane_equation(vertex0);
    final float value1 = this.substitute_plane_equation(vertex1);
    final float ratio = kvs.core.util.Math.abs(value0 / (value1 - value0));

    final int index0 =
        (int) (vertex0.getX() + vertex0.getY() * line_size + vertex0.getZ() * slice_size);
    final int index1 =
        (int) (vertex1.getX() + vertex1.getY() * line_size + vertex1.getZ() * slice_size);

    if (buf instanceof ByteBuffer) {
      ByteBuffer values = (ByteBuffer) buf;
      return (values.get(index0) + ratio * (values.get(index1) - values.get(index0)));
    } else if (buf instanceof ShortBuffer) {
      ShortBuffer values = (ShortBuffer) buf;
      return (values.get(index0) + ratio * (values.get(index1) - values.get(index0)));
    } else if (buf instanceof IntBuffer) {
      IntBuffer values = (IntBuffer) buf;
      return (values.get(index0) + ratio * (values.get(index1) - values.get(index0)));
    } else if (buf instanceof LongBuffer) {
      LongBuffer values = (LongBuffer) buf;
      return (values.get(index0) + ratio * (values.get(index1) - values.get(index0)));
    } else if (buf instanceof FloatBuffer) {
      FloatBuffer values = (FloatBuffer) buf;
      return (values.get(index0) + ratio * (values.get(index1) - values.get(index0)));
    } else if (buf instanceof DoubleBuffer) {
      DoubleBuffer values = (DoubleBuffer) buf;
      return (values.get(index0) + ratio * (values.get(index1) - values.get(index0)));
    } else if (buf instanceof CharBuffer) {
      CharBuffer values = (CharBuffer) buf;
      return (values.get(index0) + ratio * (values.get(index1) - values.get(index0)));
    } else {
      throw new KVSException("Unsupported data type");
    }
  }
Пример #2
0
  private void extract_plane(final StructuredVolumeObject volume) throws KVSException {
    // Calculated the coordinate data array and the normal vector array.
    ArrayList<Float> coords = new ArrayList<Float>();
    ArrayList<Float> normals = new ArrayList<Float>();
    ArrayList<Integer> colors = new ArrayList<Integer>();

    // Calculate min/max values of the node data.
    if (!volume.hasMinMaxValues()) {
      volume.updateMinMaxValues();
    }

    // Calculate a normalize_factor.
    double min_value = volume.minValue();
    double max_value = volume.maxValue();
    double normalize_factor = 255.0 / (max_value - min_value);

    Vector3i ncells = volume.resolution().sub(new Vector3i(1));
    int line_size = volume.nnodesPerLine();
    ColorMap color_map = transferFunction().colorMap();

    // Extract surfaces.
    int index = 0;
    for (int z = 0; z < ncells.getZ(); ++z) {
      for (int y = 0; y < ncells.getY(); ++y) {
        for (int x = 0; x < ncells.getX(); ++x) {
          // Calculate the index of the reference table.
          int table_index = this.calculate_table_index(x, y, z);
          if (table_index == 0) {
            continue;
          }
          if (table_index == 255) {
            continue;
          }

          // Calculate the triangle polygons.
          for (int i = 0; MarchingCubesTable.TriangleID[table_index][i] != -1; i += 3) {
            // Refer the edge IDs from the TriangleTable by using the table_index.
            int e0 = MarchingCubesTable.TriangleID[table_index][i];
            int e1 = MarchingCubesTable.TriangleID[table_index][i + 2];
            int e2 = MarchingCubesTable.TriangleID[table_index][i + 1];

            // Determine vertices for each edge.
            Vector3f v0 =
                new Vector3f(
                    x + MarchingCubesTable.VertexID[e0][0][0],
                    y + MarchingCubesTable.VertexID[e0][0][1],
                    z + MarchingCubesTable.VertexID[e0][0][2]);

            Vector3f v1 =
                new Vector3f(
                    x + MarchingCubesTable.VertexID[e0][1][0],
                    y + MarchingCubesTable.VertexID[e0][1][1],
                    z + MarchingCubesTable.VertexID[e0][1][2]);

            Vector3f v2 =
                new Vector3f(
                    x + MarchingCubesTable.VertexID[e1][0][0],
                    y + MarchingCubesTable.VertexID[e1][0][1],
                    z + MarchingCubesTable.VertexID[e1][0][2]);

            Vector3f v3 =
                new Vector3f(
                    x + MarchingCubesTable.VertexID[e1][1][0],
                    y + MarchingCubesTable.VertexID[e1][1][1],
                    z + MarchingCubesTable.VertexID[e1][1][2]);

            Vector3f v4 =
                new Vector3f(
                    x + MarchingCubesTable.VertexID[e2][0][0],
                    y + MarchingCubesTable.VertexID[e2][0][1],
                    z + MarchingCubesTable.VertexID[e2][0][2]);

            Vector3f v5 =
                new Vector3f(
                    x + MarchingCubesTable.VertexID[e2][1][0],
                    y + MarchingCubesTable.VertexID[e2][1][1],
                    z + MarchingCubesTable.VertexID[e2][1][2]);

            // Calculate coordinates of the vertices which are composed
            // of the triangle polygon.
            Vector3f vertex0 = this.interpolate_vertex(v0, v1);
            coords.add(vertex0.getX());
            coords.add(vertex0.getY());
            coords.add(vertex0.getZ());

            final Vector3f vertex1 = this.interpolate_vertex(v2, v3);
            coords.add(vertex1.getX());
            coords.add(vertex1.getY());
            coords.add(vertex1.getZ());

            final Vector3f vertex2 = this.interpolate_vertex(v4, v5);
            coords.add(vertex2.getX());
            coords.add(vertex2.getY());
            coords.add(vertex2.getZ());

            final double value0 = this.interpolate_value(volume, v0, v1);
            final double value1 = this.interpolate_value(volume, v2, v3);
            final double value2 = this.interpolate_value(volume, v4, v5);

            final int color0 = (int) (normalize_factor * (value0 - min_value));
            colors.add(color_map.getAt(color0).getRed());
            colors.add(color_map.getAt(color0).getGreen());
            colors.add(color_map.getAt(color0).getBlue());

            final int color1 = (int) (normalize_factor * (value1 - min_value));
            colors.add(color_map.getAt(color1).getRed());
            colors.add(color_map.getAt(color1).getGreen());
            colors.add(color_map.getAt(color1).getBlue());

            final int color2 = (int) (normalize_factor * (value2 - min_value));
            colors.add(color_map.getAt(color2).getRed());
            colors.add(color_map.getAt(color2).getGreen());
            colors.add(color_map.getAt(color2).getBlue());

            // Calculate a normal vector for the triangle polygon.
            final Vector3f normal = (vertex2.sub(vertex0)).cross(vertex1.sub(vertex0));
            normals.add(normal.getX());
            normals.add(normal.getY());
            normals.add(normal.getZ());
          } // end of loop-triangle
        } // end of loop-x
        ++index;
      } // end of loop-y
      index += line_size;
    } // end of loop-z

    m_object.setCoords(Utility.ListToFloatArray(coords));
    m_object.setColors(Utility.ListToIntArray(colors));
    m_object.setNormals(Utility.ListToFloatArray(normals));
    m_object.setOpacity((byte) 255);
    m_object.setPolygonType(PolygonObject.PolygonType.Triangle);
    m_object.setColorType(PolygonObject.ColorType.VertexColor);
    m_object.setNormalType(PolygonObject.NormalType.PolygonNormal);
  }