The angle beteen two planes

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1

Hello,
In general,there is only one angle between two planes. In the Angle Planes module,after I calculated the angle between two planes,I got three numbers(Pitch,yaw,roll),what is the meaning about the angles respectively?

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2

The transform between two planes can either be described by :

  • one rotation around the intersection line between the planes (= 1 angle + 1 axis vector)
  • three rotations around the 3 main directions of the reference frame (x,y,z or in RAS coordinate : RL, AP and SI). These are also known as “Euler angles”

That second representation is used here.