oups

Align_View_to_Face.FCMacro

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+# -*- coding: utf-8 -*-
+# Set the current view perpendicular to the selected line
+# Place la vue perpendiculairement a la line selectionnee
+# 2013 Jonathan Wiedemann,
+# 2016 Werner Mayer, 
+# 2022 tchernomax, https://forum.freecadweb.org/viewtopic.php?p=630019#p630019
+# 2023 FreeCutter, modifications towards linked objects like in workbench Assembly 4 , https://forum.freecad.org/viewtopic.php?p=718516#p718516
+#
+__title__   = "Align_View_to_Face"
+__author__  = "Jonathan Wiedemann (Rockn)"
+__url__     = "https://www.freecadweb.org/"
+__Wiki__    = "https://wiki.freecadweb.org/Macro_Align_View_to_Face"
+__version__ = "3.1"
+__date__    = "2023/11/12"  #YYYY/MM/DD
+
+from pivy import coin
+
+import FreeCAD as app
+import FreeCADGui as gui
+
+def pointAt(normal, up):
+    z = normal
+    y = up
+    x = y.cross(z)
+    y = z.cross(x)
+   
+    rot = App.Matrix()
+    rot.A11 = x.x
+    rot.A21 = x.y
+    rot.A31 = x.z
+   
+    rot.A12 = y.x
+    rot.A22 = y.y
+    rot.A32 = y.z
+   
+    rot.A13 = z.x
+    rot.A23 = z.y
+    rot.A33 = z.z
+
+    return App.Placement(rot).Rotation
+
+def get_selection_and_turn_view():
+	doc = app.activeDocument()
+	if doc is None:
+		app.Console.PrintWarning('Align_view_to_face: No file open, nothing to do\n')
+		return
+	
+	selection = gui.Selection.getSelectionEx('', 0) # Returns a vector of selection objects
+	
+	if not selection:
+		app.Console.PrintWarning('Align_view_to_face: Nothing selected, nothing to do\n')
+		return
+	
+	cam = FreeCADGui.ActiveDocument.ActiveView.getCameraNode()
+	
+	''' used to understand the 'getSelection' results
+	for selection_object in selection:
+		object_ = selection_object.Object
+		sub_fullpaths = selection_object.SubElementNames
+		if not sub_fullpaths:
+			# An object is selected, not a face, edge, vertex.
+			print(object_.Name)
+		for sub_fullpath in sub_fullpaths:
+			# One or more subelements are selected.
+			print(object_.Name, sub_fullpath)
+	'''
+	
+	sel = selection[0]
+	face = sel.SubObjects[0]
+	if face.Area == 0:			# trying to avoid errors due to wrong selected objects
+		app.Console.PrintWarning('Align_view_to_face: Please select a face - not an edge or vertex\n')
+		return
+	dir = face.normalAt(0,0)
+	
+	if dir.z == 1 :
+	    rot = pointAt(dir, App.Vector(0.0,1.0,0.0))
+	elif dir.z == -1 :
+	    rot = pointAt(dir, App.Vector(0.0,1.0,0.0))
+	else :
+	    rot = pointAt(dir, App.Vector(0.0,0.0,1.0))
+	
+	cam.orientation.setValue(rot.Q)
+	gui.SendMsgToActiveView("ViewSelection")
+	app.Console.PrintWarning('Align_view_to_face: Done\n')
+
+if __name__ == '__main__':
+	get_selection_and_turn_view()

Align_View_to_Face.FCMacro.manifest

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+[
+  "/home/pgp/.var/app/org.freecad.FreeCAD/data/FreeCAD/Macro/MultiExport-FreeCAD/Macro_Align_View_to_Face.png",
+  "/home/pgp/.var/app/org.freecad.FreeCAD/data/FreeCAD/Macro/MultiExport-FreeCAD/Align_View_to_Face.FCMacro"
+]