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");
}
}
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);
}