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I want to enforce the student groups from the same series of students to be in the same Timeslot and in the same Room for a Course Type. This is my attempt: Constraint seminarsGroupedInTheSameTimeslot(ConstraintFactory constraintFactory){ return constraintFactory //select each 2 pair of different lessons .forEachUniquePair(Lesson.class, //with the same group Joiners.equal((lesson) -> lesson.getStudentGroup().getGroup()), //with the same series Joiners.equal((lesson) -> lesson.getStudentGroup().getName()), //with the same subject Joiners.equal(Lesson::getSubject),...

I have a 3D world in Python with terrain where I want to be able to generate airplanes flying in the world with random trajectories. The terrain should be some type of constraint so the airplanes do not fly through the ground or mountains (of course not reasonable). The trajectories should also be plausible for an aircraft, i.e. a quite smooth trajectory. I was...