Vec3

new Vec3(double x, double y, double z)

public final double x, y, z;
double getX() / getY() / getZ()

double distanceTo(Vec3 other)
double distanceToSq(Vec3 other)
Vec3   add(double dx, double dy, double dz)
Vec3   add(Vec3 other)
Vec3   subtract(double dx, double dy, double dz)
Vec3   subtract(Vec3 other)
Vec3   scale(double s)
double length()