HWPS-Actions.md

@@ -515,8 +515,8 @@ L’action permet donc de travailler avec plusieurs lignes de butée présentes
 
 - Use case : Assembly procedure
 - Parameters : The parameters are identical to the stop action.
-               see [stop action](#Thrust)
-    Example: Assembly between crossbeams and posts
+see [stop action](#Thrust)
+    - Example: Assembly between crossbeams and posts
     Let's say a post profile that can be put in different orientations. 
     The crossbeams between the posts must abut the post.
     Add the stop line on the section of the column profile at the different possible stop points:
@@ -616,11 +616,31 @@ Identical to the distance in the  [stop action](#Thrust)
 
 **`Profile lengthening action`** <a name="Profilelengtheningaction"></a>
 - [return to action list](#TopList)
-- Definition
-- Use case
-- Parameters
-
-  
+- Definition : this action allows to extend one or more profiles at a node by means of a formula
+![image](uploads/929da85ac23ae850c4a2a745ac339a94/image.png)
+- Use case : Assembly procedure
+- Parameters : 
+     - **Index of bar 1** : index of the bar, in the assembly node, of the profile(s) to undergo elongation 
+
+     - **Profile identification by line** : line to identify the profile(s) of the IB1 bar to undergo the action
+
+     - **Distance** : elongation formula.  The positive direction is determined by the direction of the extrusion axis Z (positive from 2 to 1.  A profile is always extruded in the negative Z (see extrusion of a profile))
+
+  ![image](uploads/874fbd3c4ed3dc25db4560c8a1397318/image.png)
+       
+       - Note: In the distance of the stretch action, it is possible to use the variables of the bar object of bar 1.
+It is not mandatory to use a variable of the node object.
+If I want a distance depending on the slope of the bar I can write either : 
+- b.slope
+- n.vbeams(...).slope
+    - **Style** : 
+       - Straight: the cutting plane of the profiles is perpendicular to the bar
+       - Vertical: the cutting plane of the profiles is a vertical plane
+       ![image](uploads/51f80d4b2a1365e8f4c178f0901065d7/image.png)
+  - **Mesh index** : index of the mesh in the node 
+     - Values: 
+       - from 0 to n.meshcount-1: when one of the profiles concerned by the action is extruded on a mesh (in other words, in the positioned profile action, the "extrusion" parameter is mesh side1 or mesh side2) it is necessary to indicate on which mesh in the node the profile is located.
+        - -1 : when the profiles concerned by the action are all extruded at the bar (no notion of mesh)
 
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