public Winding translate(Vector3f offset) {
if (verts.isEmpty()) {
return this;
}
ArrayList<Vector3f> vertsNew = new ArrayList<>();
for (Vector3f vert : verts) {
vertsNew.add(vert.add(offset));
}
return new Winding(vertsNew);
}
/**
* Rotates all vertices in this winding by the given euler angles.
*
* @param angles rotation angles
*/
public Winding rotate(Vector3f angles) {
if (verts.isEmpty()) {
return this;
}
ArrayList<Vector3f> vertsNew = new ArrayList<>();
for (Vector3f vert : verts) {
vertsNew.add(vert.rotate(angles));
}
return new Winding(vertsNew);
}
public Winding addBackface() {
if (verts.isEmpty()) {
return this;
}
List<Vector3f> vertsNew = new ArrayList<>();
final int size = verts.size();
for (int i = 0; i < size; i++) {
if (i != 0) {
vertsNew.add(verts.get(i));
}
if (i != size) {
vertsNew.add(verts.get(i));
}
}
return new Winding(vertsNew);
}
/**
* Removes degenerated vertices from this winding. A vertex is degenerated when its distance to
* the previous vertex is smaller than {@link EPS_DEGEN}.
*
* @return number of removed vertices
*/
public Winding removeDegenerated() {
if (verts.isEmpty()) {
return this;
}
ArrayList<Vector3f> vertsNew = new ArrayList<>();
final int size = verts.size();
for (int i = 0; i < size; i++) {
int j = (i + 1) % size;
Vector3f v1 = verts.get(i);
Vector3f v2 = verts.get(j);
if (v1.sub(v2).length() > EPS_DEGEN) {
vertsNew.add(v1);
}
}
return new Winding(vertsNew);
}
/**
* Removes collinear vertices from this winding.
*
* @return number of removed vertices
*/
public Winding removeCollinear() {
if (verts.isEmpty()) {
return this;
}
ArrayList<Vector3f> vertsNew = new ArrayList<>();
final int size = verts.size();
for (int i = 0; i < size; i++) {
int j = (i + 1) % size;
int k = (i + size - 1) % size;
Vector3f v1 = verts.get(j).sub(verts.get(i)).normalize();
Vector3f v2 = verts.get(i).sub(verts.get(k)).normalize();
if (v1.dot(v2) < 0.999) {
vertsNew.add(verts.get(i));
}
}
return new Winding(vertsNew);
}
@Override
public boolean isEmpty() {
return verts.isEmpty();
}