@Override
public final boolean isFacing(Vector vector) {
vector = vector.copy();
vector.subtract(vectors.get(0));
return normal.getDotProduct(vector) >= 0.0D;
}
private double doGetIntersectionForTriangle(Ray ray, Vector a, Vector b, Vector c) {
Vector direction = ray.getDirection();
Vector edge1 = Vector.copyAndSubtract(b, a);
Vector edge2 = Vector.copyAndSubtract(c, a);
Vector p = Vector.toCrossProduct(direction, edge2);
double determinant = edge1.getDotProduct(p);
if (determinant == 0.0D) {
return -1.0D;
}
double inverseDeterminant = 1.0D / determinant;
Vector origin = Vector.newInstance(ray.getOrigin());
Vector vector = Vector.copyAndSubtract(origin, a);
double u = vector.getDotProduct(p) * inverseDeterminant;
if (u < 0.0D || u > 1.0D) {
return -1.0D;
}
Vector q = Vector.toCrossProduct(vector, edge1);
double v = direction.getDotProduct(q) * inverseDeterminant;
if (v < 0.0D || u + v > 1.0D) {
return -1.0D;
}
double t = edge2.getDotProduct(q) * inverseDeterminant;
if (t > EPSILON) {
return t;
} else {
return -1.0D;
}
}
@Override
public final BoundingBox getBounds() {
BoundingBox boundingBox = BoundingBox.newInstance();
double minimum = Double.MAX_VALUE;
Vector u = Vector.newInstance(0.0D, 0.0D, 0.0D);
Vector v;
Vector d = Vector.newInstance(0.0D, 0.0D, 0.0D);
int size = vectors.size();
for (int i = 0; i < size; i++) {
Vector vector1 = vectors.get((i + 1) % size);
Vector vector2 = vectors.get(i);
u.set(vector1);
u.subtract(vector2);
u.normalize();
v = Vector.toCrossProduct(getNormal(), u);
v.normalize();
double uMaximum = 0.0D;
double uMinimum = 0.0D;
double vMaximum = 0.0D;
double vMinimum = 0.0D;
for (int j = 0; j < size; j++) {
if (i != j) {
Vector vector3 = vectors.get(j);
d.set(vector3);
d.subtract(vector2);
double uLength = d.getDotProduct(u);
double vLength = d.getDotProduct(v);
uMaximum = Math.max(uLength, uMaximum);
uMinimum = Math.min(uLength, uMinimum);
vMaximum = Math.max(vLength, vMaximum);
vMinimum = Math.min(vLength, vMinimum);
}
}
double current = (uMaximum - uMinimum) * (vMaximum - vMinimum);
if (current < minimum) {
minimum = current;
Vector origin = boundingBox.getOrigin();
origin.set(vector2);
d.set(u);
d.multiply(uMinimum);
origin.add(d);
d.set(v);
d.multiply(vMinimum);
origin.add(d);
boundingBox.getU().set(u);
boundingBox.getV().set(v);
boundingBox.setHeight(vMaximum - vMinimum);
boundingBox.setWidth(uMaximum - uMinimum);
}
}
return boundingBox;
}
