What is the difference between Dharmakaya and Sambhogakaya? Within the Trikāya doctrine (the bodies of the Buddha) I've never felt very clear about the differences between the Dharmakaya and Sambhogakaya. I believe that the  Nirmanakaya is the physicality of the Buddha (happy to be corrected on this) but I'm vague about what Dharmakaya and Sambhogakaya are and how they relate to each other.

I'd appreciate if anyone can summarise the differences and the relations between them. I'm interested in answers from all traditions - I'm unsure if there are variations in interpretations of the doctrines across Buddhist schools and traditions to be honest.
Chogyam Trungpa explained dharmakaya as the experience of the ultimate, nirmanakaya as coming at peace with the relative, and sambhogakaya as an ability of practitioner-turning-teacher to skilfully join together the ultimate and the relative, to keep a foot in both worlds and facilitate communication between the two:

1. Dharmakaya


  "Dharmakaya has no categories; dharmakaya is simply being awake. It is the first achievement of a buddha; the first glimpse of vajra-like samadhi. Vajra-like samadhi means cutting through everything, completely and thoroughly. You cut through psychological and spiritual materialism and you cut through the notion of perfectionism as well."
  
  "[At this stage] there maybe uncertainty as to how perceive things, and you don't know how to make a particular situation graspable. Our reaction to the world is uncertain and bewildered, and strategies and planning have not yet formed."
  
  "The dharmakaya aspect is basic openness or ambiguity. We could say that a buddha actually sees the world from a nonreference point of view. They see that the world can exist without a reference point, that reference points are no longer applicable. When you possess such an enlightened view, you attain dharmakaya, the body of nonreference point. Dharma means "the highest norm of the universe", which is nonreference point. Kaya refers to the achievement of that particular experience."
  
  "With no praise and no blame, we accept and realize our thought process as it is -- but with a touch of nonfixation and without holding on to thoughts."


2. Nirmanakaya


  "In the niramanakaya aspect, the second stage of this process, there is clarity. You develop a clear idea of the situation and how to organize things. According to my tradition, that is the realistic way of looking at things. Even if you are a great teacher or a buddha, you still have a body and that body behaves more or less the same as other people's bodies. The necessities of eating, shitting, wearing clothes, and combing your hair are basically the same as anybody else's."
  
  "It is in that acceptance of the universe, within that particular frame of reference, that the nirmanakaya buddha functions."


3. Sambhogakaya


  "Third, you begin to make a relationship between the two. In order to make a link between the openness and clarity, we have the third aspect, or sambhogakaya. The sambhogakaya bridges the gap between the basic openness or ambiguity of dharmakaya and the very specific organized clarity of nirmanakaya. So the three kayas are the subtle world, the direct world, and that which goes back and forth between the subtle and direct worlds in order to survive on earth."
  
  "Sambhogakaya means 'complete joy', it is beyond any kind of inhibition. Having gone through constant struggle and discipline of practicing the bodhisattva's work of compassion, whatever you feel can be communicated or taught. There is a need for articulation... You have to do something, you have to proclaim."
  
  "[However, ] you can't just say, 'Come and look at me'. You have to be very skillful, particularly if you proclaim yourself as an enlightened person, for then you have a heavier burden. So the sambhogakaya involves a sense of relationship (as in, being able to relate -- AV). You know the place, you know what kind of crowd you're going to get, and you know what you are going to say."
  
  "This communication between your non-manifested and manifested levels ... includes all forms of communication, such as physical gestures, facial expressions, and how you present yourself in all kinds of ways."


4. Svabhavikakaya


  "The fourth kaya, svabhavikakaya, is the whole thing, the total panoramic experience. When we realize the link between the three kayas, that totality is known as svabhavikakaya. The svabhavikakaya is a state of mind that is known as transcending birth, cessation, and dwelling."
  
  "Since you have no fear, you seem to know everything in the very highest sense. You know how to handle things."