private int getMiddle(int v1, Point2D p1, int v2, Point2D p2) {
String key = "" + Math.min(v1, v2) + "_" + Math.max(v1, v2);
if (map.get(key) != null) {
return map.get(key);
}
texCoord1.add(p1.add(p2).multiply(0.5f));
map.put(key, index.get());
return index.getAndIncrement();
}
private TriangleMesh createTetrahedra(float height, int level) {
TriangleMesh m0 = null;
if (level > 0) {
m0 = createTetrahedra(height, level - 1);
}
if (level == 0) {
a = new Affine();
float hw = height;
if (center.get() != null) {
a = a.createConcatenation(new Translate(center.get().x, center.get().y, center.get().z));
}
final float[] baseVertices =
new float[] {
0f,
0f,
0.612372f * hw,
-0.288675f * hw,
-0.5f * hw,
-0.204124f * hw,
-0.288675f * hw,
0.5f * hw,
-0.204124f * hw,
0.57735f * hw,
0f,
-0.204124f * hw
};
final float[] baseTexCoords =
new float[] {
0f, 0f,
0.5f, 0.866025f,
1f, 0f,
1f, 1.73205f,
1.5f, 0.866025f,
2f, 0f
};
final int[] baseTexture =
new int[] {
0, 2, 1,
3, 1, 4,
2, 4, 1,
4, 2, 5
};
final List<Integer> baseFaces = Arrays.asList(1, 2, 3, 2, 1, 0, 3, 0, 1, 0, 3, 2);
for (int i = 0; i < baseVertices.length / 3; i++) {
Point3D ta =
transform(baseVertices[3 * i], baseVertices[3 * i + 1], baseVertices[3 * i + 2]);
baseVertices[3 * i] = ta.x;
baseVertices[3 * i + 1] = ta.y;
baseVertices[3 * i + 2] = ta.z;
}
points0 = baseVertices;
numVertices = baseVertices.length / 3;
texCoord0 = baseTexCoords;
numTexCoords = baseTexCoords.length / 2;
faces0 =
IntStreams.range(0, baseFaces.size() / 3)
.mapToObj(
i ->
IntStreams.of(
baseFaces.get(3 * i),
baseTexture[3 * i],
baseFaces.get(3 * i + 1),
baseTexture[3 * i + 1],
baseFaces.get(3 * i + 2),
baseTexture[3 * i + 2]))
.flatMapToInt(i -> i)
.toArray();
numFaces = baseFaces.size() / 3;
} else if (m0 != null) {
points0 = new float[numVertices * m0.getPointElementSize()];
m0.getPoints().toArray(points0);
}
List<Point3D> points1 =
IntStreams.range(0, numVertices)
.mapToObj(i -> new Point3D(points0[3 * i], points0[3 * i + 1], points0[3 * i + 2]))
.collect(Collectors.toList());
if (level > 0 && m0 != null) {
texCoord0 = new float[numTexCoords * m0.getTexCoordElementSize()];
m0.getTexCoords().toArray(texCoord0);
}
texCoord1 =
IntStreams.range(0, numTexCoords)
.mapToObj(i -> new Point2D(texCoord0[2 * i], texCoord0[2 * i + 1]))
.collect(Collectors.toList());
if (level > 0 && m0 != null) {
faces0 = new int[numFaces * m0.getFaceElementSize()];
m0.getFaces().toArray(faces0);
}
List<Face3> faces1 =
IntStreams.range(0, numFaces)
.mapToObj(i -> new Face3(faces0[6 * i], faces0[6 * i + 2], faces0[6 * i + 4]))
.collect(Collectors.toList());
index.set(points1.size());
map.clear();
listVertices.clear();
listFaces.clear();
listVertices.addAll(points1);
Iterables.forEach(
faces1,
face -> {
int v1 = face.p0;
int v2 = face.p1;
int v3 = face.p2;
if (level > 0) {
int a = getMiddle(v1, points1.get(v1), v2, points1.get(v2));
int b = getMiddle(v2, points1.get(v2), v3, points1.get(v3));
int c = getMiddle(v3, points1.get(v3), v1, points1.get(v1));
listFaces.add(new Face3(v1, a, c));
listFaces.add(new Face3(v2, b, a));
listFaces.add(new Face3(v3, c, b));
listFaces.add(new Face3(a, b, c));
} else {
listFaces.add(new Face3(v1, v2, v3));
}
});
map.clear();
numVertices = listVertices.size();
numFaces = listFaces.size();
List<Face3> textures1;
if (level == 0) {
textures1 =
IntStreams.range(0, faces0.length / 6)
.mapToObj(i -> new Face3(faces0[6 * i + 1], faces0[6 * i + 3], faces0[6 * i + 5]))
.collect(Collectors.toList());
} else {
textures1 = stream(listTextures).map(t -> t).collect(Collectors.toList());
}
index.set(texCoord1.size());
listTextures.clear();
Iterables.forEach(
textures1,
face -> {
int v1 = face.p0;
int v2 = face.p1;
int v3 = face.p2;
if (level > 0) {
int a = getMiddle(v1, texCoord1.get(v1), v2, texCoord1.get(v2));
int b = getMiddle(v2, texCoord1.get(v2), v3, texCoord1.get(v3));
int c = getMiddle(v3, texCoord1.get(v3), v1, texCoord1.get(v1));
listTextures.add(new Face3(v1, a, c));
listTextures.add(new Face3(v2, b, a));
listTextures.add(new Face3(v3, c, b));
listTextures.add(new Face3(a, b, c));
} else {
listTextures.add(new Face3(v1, v2, v3));
}
});
map.clear();
texCoord0 =
stream(texCoord1)
.flatMapToDouble(p -> DoubleStreams.of(p.getX(), p.getY()))
.collect(
() -> new FloatCollector(texCoord1.size() * 2),
FloatCollector::add,
FloatCollector::join)
.toArray();
numTexCoords = texCoord0.length / 2;
textureCoords = texCoord0;
if (level == getLevel()) {
areaMesh.setWidth(2f * height);
areaMesh.setHeight(height * Math.sqrt(3));
// 1<<j -> bitset, 00100. Otherwise: 000111 will mean they are shared
smoothingGroups =
IntStreams.range(0, listFaces.size())
.map(i -> 1 << (i / (listFaces.size() / 4)))
.toArray();
// smoothing groups based on 3DViewer -> same result
// float[] normals=new float[]{1,0,0,-1,0,0,0,1,0,0,-1,0,0,0,1,0,0,-1};
// int[] newFaces = IntStreams.range(0, listFaces.size())
// .mapToObj(i->IntStream.of((int)listFaces.get(i).x,
// (int)listFaces.get(i).x,
// (int)listFaces.get(i).y, (int)listFaces.get(i).y,
// (int)listFaces.get(i).z, (int)listFaces.get(i).z))
// .flatMapToInt(i->i).toArray();
// int[] newFaceNormals = IntStreams.range(0,listFaces.size()).mapToObj(i->{
// int j=(i/(listFaces.size()/6));
// return IntStream.of(j,j,j);
// }).flatMapToInt(i->i).toArray();
// smoothingGroups=SmoothingGroups.calcSmoothGroups(new TriangleMesh(), newFaces,
// newFaceNormals, normals);
}
return createMesh();
}