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--- start:plugins:rhinobeamtools:rbt-usermanual [2021/03/15 11:38]
adminmar Grammatical and spelling check
+++ start:plugins:rhinobeamtools:rbt-usermanual [2021/04/19 21:18]
adminmar [Definitions] Added Beam Local axes definitions
@@ Line 25: / Line 25: @@
 Beams are oriented lines located between two nodes ((More specifically, two nodes definition numbers)). They are represented as an arrow and have an optional angle option.
 Every beam in the model is identified by a unique number.
-=== Sets ===
+== Beams local axes ==
+Each beam has an angle referred to as θ, and an associated system of local axes x, y, z defined as follows:
+  *  O is the origin of the beam
+  *  E is the end of the beam
+  *  OX, OY, OZ are three axes passing through O and parallel respectively to the three global axes X, Y, Z
+  *  x is the axis orientated from O to E
+  *  OV is an axis :
+    *  perpendicular to x
+    *  contained in the plane x, OY
+    *  oriented like OY (VOY angle >= 90º)
+    *  But, if x is parallel to OY, then:
+      *  if x is orientated like OY, then OV is orientated in the opposite direction of OX
+      *  if x is orientated in the opposite direction of OY, then OV is orientated like OX
+  *  y is the axis obtained by rotating OV clockwise with respect to x by an angle equal to θ (when θ = 0º, y is identical to OV)
+  *  z is the axis perpendicular to x and y and forming with them a dextrose trihedron
+These rules are designed to fit //Steel//'s requirements, thus they might be different when exporting to RDM6-7.
+== Sets ==
 A set is a group of beams. It is mainly used to easily select beams together.
 ==== Interface ====