Macro TNP Solution: Difference between revisions

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'''Next search all faces for the stored key:'''
'''Next search all faces for the stored key:'''


After the resize I search all faces for the stored key. Because if the Sketch and Face for to stored key were at the same plane XY. The Z axis value was the same for both. At the PartDesign you cannot move 3rd Pad above the 2nd Pad, the next Pad with the Sketch always will be touching the face. At the new face the Z axis value always will be the same with the stored key. So, just return the index. Nothing more to do.
After the resize I search all faces for the stored key. Because if the Sketch and Face for to stored key were at the same plane XY. The Z axis value was the same for both. At the PartDesign you cannot move 3rd Pad above the 2nd Pad, to have gap between, this is single object, the next Pad with the Sketch always will be touching the face. At the new face the Z axis value always will be the same with the stored key. So, return the face index. Nothing more to be done.


{{MacroCode|code=
{{MacroCode|code=

Revision as of 11:23, 16 August 2022

TNP_solution

Description
This is solution for Topological Naming Problem.

Macro version: 1.0
Last modified: 2022-08-16
Author: Dprojects
Author
Dprojects
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Links
Macro Version
1.0
Date last modified
2022-08-16
FreeCAD Version(s)
None
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See also
None

Description

Solution description

This is solution for Topological Naming Problem described at: Topological Naming Problem

If you build object at another object, and also with Sketch it is straightforward to solve, because you know two things:

  1. Points from Sketch is always part of the face below
  2. The Sketch and the face below are in the same plane

To solve Topological Naming Problem problem you can:

Store the key before any operation:

You need only store the key before any operation. For this example described at Topological Naming Problem page the object is at XY plane. So, I use Z axis value from Sketch BoundBox center:

ad = FreeCAD.ActiveDocument
p2 = ad.Pad002
s2 = p2.Profile[0]
key = round(s2.Shape.BoundBox.Center[2], precision)

Next search all faces for the stored key:

After the resize I search all faces for the stored key. Because if the Sketch and Face for to stored key were at the same plane XY. The Z axis value was the same for both. At the PartDesign you cannot move 3rd Pad above the 2nd Pad, to have gap between, this is single object, the next Pad with the Sketch always will be touching the face. At the new face the Z axis value always will be the same with the stored key. So, return the face index. Nothing more to be done.

def getFaceIndex(iObj, iBB):
	
	index = 0	

	for f in iObj.Shape.Faces:

		index += 1
		bb = round(f.BoundBox.Center[2], precision)
		if bb == iBB:
			return index

	return -1

Final steps

At the end I assign the new face to the Sketch and recompute. To be honest, the most difficult part was to assign the face to Sketch.Support, for me the syntax is mind-blowing ;-)

Summary

In this example the plane is XY, but you can do exactly the same for other axes. Also you can choose other key. The same you can do for edges at Chamfer or Fillets. This is already solved at Woodworking project and is already available in its library.

File for testing has been uploaded at FreeCAD forum: TNP.FCStd. However, this example is not important. The Topological Naming Problem page describe in details how to create such example. One thing I added there is Constraint to be able to resize the Pad from script. This solution show how to approach the Topological Naming Problem.

Code

__Title__="TNP_solution"
__Author__ = "Dprojects"
__Version__ = "1.0"
__Date__    = "2022-08-16"
__Comment__ = ""
__Web__ = "https://github.com/dprojects/Woodworking"
__Wiki__ = "https://wiki.freecadweb.org/TNP_solution"
__Icon__  = "TNP_solution.png"
__IconW__  = "TNP_solution.png"
__Help__ = "solution for Topological Naming Problem"
__Status__ = "stable"
__Requires__ = ""
__Communication__ = "http://www.freecadweb.org/wiki/index.php?title=User:Dprojects"

# ####################################################################
#
# This is solution for Topological Naming Problem described at 
# https://wiki.freecadweb.org/Topological_naming_problem
#
# MIT License
# 
# Copyright (c) 2022 Darek L github.com/dprojects
# 
# Permission is hereby granted, free of charge, to any 
# person obtaining a copy of this software and associated 
# documentation files (the "Software"), to deal in the 
# Software without restriction, including without limitation 
# the rights to use, copy, modify, merge, publish, distribute, 
# sublicense, and/or sell copies of the Software, and to permit 
# persons to whom the Software is furnished to do so, subject 
# to the following conditions:
# 
# The above copyright notice and this permission notice shall 
# be included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
# DEALINGS IN THE SOFTWARE.
# 
# ####################################################################

import FreeCAD

# this should be set according 
# FreeCAD user GUI precision settings
precision = 5

# global settings
ad = FreeCAD.ActiveDocument

# middle object to be resized
p1 = ad.Pad001
s1 = p1.Profile[0]

# top object bottom to store key
p2 = ad.Pad002
s2 = p2.Profile[0]

# ####################################################################
def getFaceIndex(iObj, iBB):
	
	index = 0	

	for f in iObj.Shape.Faces:

		index += 1
		bb = round(f.BoundBox.Center[2], precision)
		
		FreeCAD.Console.PrintMessage("\n")
		FreeCAD.Console.PrintMessage(index)
		FreeCAD.Console.PrintMessage(" ")
		FreeCAD.Console.PrintMessage(bb)

		if bb == iBB:
			FreeCAD.Console.PrintMessage(" <=== found")
			return index

	return -1

# ####################################################################
def makeTNP():

	# set key
	key = round(s2.Shape.BoundBox.Center[2], precision)

	# resize and cause TNP
	s1.setDatum(9, FreeCAD.Units.Quantity('350'))

	# recompute
	s1.recompute()
	p1.recompute()
	ad.recompute()

	FreeCAD.Console.PrintMessage("\n\n")
	FreeCAD.Console.PrintMessage("Stored key:"+str(key))
	FreeCAD.Console.PrintMessage("\n")

	# search all faces for solution
	solutionIndex = getFaceIndex(p1, key)
	solution = "Face"+str(solutionIndex)
	
	FreeCAD.Console.PrintMessage("\n\n")
	FreeCAD.Console.PrintMessage("Solution: "+solution)
	
	# set exact face to Sketch
	s2.Support = (p1, (solution,))
	ad.recompute()

# ####################################################################
def moveBack():

	s1.setDatum(9, FreeCAD.Units.Quantity('250'))
	s2.Support = (p1, ('Face13',))
	ad.recompute()

# ####################################################################
# main
# ####################################################################

# uncomment what you want
makeTNP()
#moveBack()

# ####################################################################