



Description

Context

This macro has been written mainly to circumvent Topological Naming Issue that can break a model when a sketch has been directly or indirectly attached to a face or any other topological item. To prevent breakage, macro shall be applied when the model is still right. It can't "repair" a broken model. If you just break your model, undo the last change(s) back to a good situation, apply the macro to the unstable sketch(es) then redo the previous operation.

Usage

Functionally, the macro will remove the current mapping of the sketch on which it is applied, then apply to it an absolute placement so it is immune to mapping support change.

To do so, the macro will basically propose 3 options (if your sketch isn't in a PartDesign Body, only first option is available and will be applied automatically) :

"Raw" mode => the sketch placement is made absolute in the body referential, nothing more

"DP@Face mode" => a datum plane is created where the mapping face is, then the sketch is attached to it respecting its attachment offset

"DP@Sketch" mode => a datum place is created where the sketch is (including attachment offset), then the sketch is attached to its origin

To use the macro, just select the target sketch (eg. in the tree view) then run the macro. That's it !

Installation

The macro is available through Addon Manager. Code is provided on this page for convenience in case user system doesn't have git-python. Though it should be up-to-date, latest release is always available at FreeCAD-macro repository

For more detailed explanations, see the How to install macros page.

Details

For better understanding, below is an example : Let's suppose a simple cube whose top (yellow) face has been drafted. A cylinder is created with a padded circle whose sketch has been mapped (Flat face) to the drafted face and offset to match needs (Attachment offset) :

Now for some reason, you need to revert the pull direction of the draft (of course without the cylinder to move). Here is what basically happen :

The treeview shows an error, the 3D view isn't updated, and the circle sketch is floating in the middle of nowhere...

Now comes the job of the macro (that you need to run before changing the reference face, when the sketch is still at its right place). Select the sketch and run it. If your sketch is in a body, a message box will ask to choose among the 3 different options (if your sketch is out of a body, it will automatically apply the 1st one) :

"Raw" mode

"DP@Face mode"

"DP@Sketch" mode

Which in term of picture gives the following :

Script

ToolBar Icon

Macro_SketchUnmap.FCMacro

#!/usr/bin/python ##################################### # Copyright (c) openBrain 2019 # Licensed under LGPL v2 # # This FreeCAD macro will unmap a sketch from eg. a face and make its placement absolute in the body. It proposes 3 options (forcely the first if sketch not in a body) : # * "Raw" mode => the sketch placement is made absolute in the body referential, nothing more # * "DP@Face mode" => a datum plane is created where the mapping face is, then the sketch is attached to it respecting its attachment offset # * "DP@Sketch" mode => a datum place is created where the sketch is (including attachment offset), then the sketch is attached to its origin # # Main use of the macro is to make design more robust to topological naming issue # # Version history : # *0.6.2 : add icon (metadata) # *0.6.1 : minor changes after PR review # *0.6 : some typo improvement + commenting for official PR # *0.5 : beta release # ##################################### __Name__ = 'SketchUnmap' __Comment__ = 'Unmap a sketch & makes its placement absolute"' __Author__ = 'openBrain' __Version__ = '0.6.2' __Date__ = '2019-06-14' __License__ = 'LGPL v2' __Web__ = 'https://www.freecadweb.org/wiki/Macro_SketchUnmap' __Wiki__ = 'https://www.freecadweb.org/wiki/Macro_SketchUnmap' __Icon__ = 'SketchUnmap.svg' __Help__ = 'Select the sketch to unmap (eg. in the tree view) then run the macro' __Status__ = 'Beta' __Requires__ = 'FreeCAD >= 0.17' __Communication__ = 'https://forum.freecadweb.org/viewtopic.php?f=22&t=36078' # __Files__ = '' __dbg__ = False #True for debugging from PySide import QtGui def cslM(msg): #Print message in console FreeCAD.Console.PrintMessage('

') FreeCAD.Console.PrintMessage(msg) def cslW(msg): #Print warning in console FreeCAD.Console.PrintMessage('

') FreeCAD.Console.PrintWarning(msg) def cslE(msg): #Print error in console FreeCAD.Console.PrintMessage('

') FreeCAD.Console.PrintError(msg) def cslD(msg): #Print debug message in console if __dbg__: FreeCAD.Console.PrintMessage('

') FreeCAD.Console.PrintMessage("Debug : " + str(msg)) _0Vec_ = FreeCAD.Vector(0, 0, 0) #Shortener for null vector _ZVec_ = FreeCAD.Vector(0, 0, 1) #Shortener for Z axis if __dbg__: ##Clear report view in debug mode FreeCADGui.getMainWindow().findChild(QtGui.QTextEdit, "Report view").clear() cslM("Starting SketchUnmap macro") cslD("Checking selection") ##If selection is wrong, print error message and exit if (len(Gui.Selection.getSelection()) != 1 or str(Gui.Selection.getSelection()[0]) != '<Sketcher::SketchObject>'): cslE("You must select a sketch that you want to unmap (and only one) ... Exiting") else: cslD("Selection OK") App.ActiveDocument.openTransaction("SketchUnmap") #Open transaction for undo management sk = Gui.Selection.getSelection()[0] #Get target sketch skNatPl = sk.Placement #Store placement skNatAO = sk.AttachmentOffset #Store attachment offset skInBody = False for obj in sk.InList: ##Check if sketch is inside a Body if obj.TypeId == 'PartDesign::Body': skInBody = True skBody = obj cslD("Sketch in a body : " + str(skInBody)) msgb = QtGui.QMessageBox() ##Prepare the message box to choose option msgb.setWindowTitle("Unmap Sketch : Mode selection") msgb.setText("""Choose which unmapping mode you want to apply : Raw => the sketch placement is made absolute in the body referential, nothing more DP@Face => a datum plane is created where the mapping face is, then the sketch is attached to it respecting its attachment offset DP@Sketch => a datum place is created where the sketch is (including attachment offset), then the sketch is attached to its origin Click 'Cancel' to cancel operation""") msgb.setIcon(QtGui.QMessageBox.Question) rbut = msgb.addButton("Raw", QtGui.QMessageBox.AcceptRole) fbut = msgb.addButton("DP@Face", QtGui.QMessageBox.AcceptRole) sbut = msgb.addButton("DP@Sketch", QtGui.QMessageBox.AcceptRole) cbut = msgb.addButton("Cancel", QtGui.QMessageBox.RejectRole) if skInBody: #If sketch in a Body msgb.exec_() ##Show message box and get user choice msgbRep = msgb.clickedButton() else: msgbRep = rbut #Else apply raw mode automatically if msgbRep == rbut: #If raw mode sk.Support = None ##Just unmap the sketch so its placement is absolute sk.MapMode = 'Deactivated' elif msgbRep == fbut: #If DP@Face mode newDP = skBody.newObject('PartDesign::Plane','DP' + sk.Name) #Create a datum plane if sk.Label != sk.Name: ##Eventually clarify its label newDP.Label = 'DP' + sk.Label newDP.Support = None ##Plane is placed absolute newDP.MapMode = 'Deactivated' newDP.Placement = skNatPl.multiply(skNatAO.inverse()) #Plane placement is set to former face one sk.Support = [(newDP,'')] #Sketch is mapped to plane keeping its attachment offset elif msgbRep == sbut: #If DP@Sketch mode newDP = skBody.newObject('PartDesign::Plane','DP' + sk.Name) #Create a datum plane if sk.Label != sk.Name: ##Eventually clarify its label newDP.Label = 'DP' + sk.Label newDP.Support = None ##Plane is placed absolute newDP.MapMode = 'Deactivated' newDP.Placement = skNatPl #Plane placement is set to former sketch one sk.Support = [(newDP,'')] ##Sketch is mapped to plane resetting its attachment offset sk.AttachmentOffset = App.Placement(_0Vec_, App.Rotation(_ZVec_, 0)) App.ActiveDocument.commitTransaction() #Commit transaction for undo management cslM("SketchUnmap Macro ended correctly")

Limitations

Only process one sketch at a time

Only work on sketch objects

Forum discussion

For any feedback (bug, feature request, comments, ...), please use this forum thread : (FR) macro to remap sketch to different reference