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All the internal calculations of JSCAD (and other included libraries) are based on the 'right-hand' rule. (For more information see discussions here and here.)

This results in the following orientation of the three-dimensional coordinate system, i.e. orientation of X, Y, and Z axis.

  • Positive X points to the right
  • Positive Y points to the back
  • Positive Z points to the top

This also means that positive rotations are

  • From positive X to positive Y about the Z axis
  • From positive Y to positive Z about the X axis
  • From positive Z to positive X about the Y axis

It may take some time to understand well, and can be visualized by rotating shapes by both positive and negative angles.