public static void calculateAndSetNormalVectorsForCurve(IndexedLineSet ils) {
double[][] polygon = ils.getVertexAttributes(Attribute.COORDINATES).toDoubleArrayArray(null);
int n = polygon.length;
double[][] normals = new double[n][4];
if (n <= 1) {
throw new IllegalArgumentException("Can't tube a vertex list of length less than 2");
}
double[][] polygon2 = new double[n + 2][];
for (int i = 0; i < n; ++i) {
polygon2[i + 1] = polygon[i];
polygon2[0] = Rn.add(null, polygon[0], Rn.subtract(null, polygon[0], polygon[1]));
polygon2[n + 1] =
Rn.add(null, polygon[n - 1], Rn.subtract(null, polygon[n - 1], polygon[n - 2]));
}
FrameInfo[] frames =
new TubeFactory().makeFrameField(polygon2, FrameFieldType.FRENET, Pn.EUCLIDEAN);
for (int i = 0; i < n; ++i) {
for (int j = 0; j < 4; ++j) {
normals[i][j] = frames[i].frame[4 * j];
}
normals[i][3] *= -1;
Pn.normalize(normals[i], normals[i], Pn.EUCLIDEAN);
}
ils.setVertexAttributes(
Attribute.NORMALS, StorageModel.DOUBLE_ARRAY.array(4).createReadOnly(normals));
}
static {
int n = octagonalCrossSection.length;
urTubeLength = n;
urTubeVerts = new double[2 * n][3];
for (int i = 0; i < 2; ++i) {
for (int j = 0; j < n; ++j) {
int q = n - j - 1;
System.arraycopy(octagonalCrossSection[j], 0, urTubeVerts[i * n + q], 0, 3);
if (i == 0) urTubeVerts[i * n + q][2] = -0.5;
else urTubeVerts[i * n + q][2] = 0.5;
}
}
DataList verts =
StorageModel.DOUBLE_ARRAY.array(urTubeVerts[0].length).createReadOnly(urTubeVerts);
for (int k = 0; k < 3; ++k) {
canonicalTranslation[k] = P3.makeTranslationMatrix(null, translation, metrics[k]);
QuadMeshFactory qmf = new QuadMeshFactory(); // metrics[k], n, 2, true, false);
qmf.setMetric(Pn.EUCLIDEAN); // metrics[k]);
qmf.setULineCount(n);
qmf.setVLineCount(2);
qmf.setClosedInUDirection(true);
qmf.setVertexCoordinates(verts);
qmf.setGenerateEdgesFromFaces(true);
qmf.setEdgeFromQuadMesh(true);
qmf.setGenerateFaceNormals(true);
qmf.setGenerateVertexNormals(true);
qmf.setGenerateTextureCoordinates(true);
qmf.update();
urTube[k] = qmf.getIndexedFaceSet();
urTube[k].setName("urTube" + k);
if (k == 1)
urTube[k].setGeometryAttributes(
CommonAttributes.RMAN_PROXY_COMMAND, "Cylinder 1.0 -.5 .5 360");
}
}