App.Rotate with cylinders

[fjod]

Please send help.

Ok here is the test script I wrote just to check if I have not gone mad.

Code: Select all

import sys

sys.path.append("C:\\Program Files\\FreeCAD 0.17\\bin")
sys.path.append("C:\\Program Files\\FreeCAD 0.17\\lib")

import FreeCAD as App

import FreeCAD, FreeCADGui
FreeCADGui.setupWithoutGUI()
import Mesh
document = FreeCAD.newDocument("testDoc")
stvolikObj = App.ActiveDocument.addObject("Part::Cylinder", "Outer")
stvolikObj.Radius = str(float(8)/2) + ' mm'
stvolikObj.Height = str(float(30) + 2) + ' mm'

for number in range(5):
    box = App.ActiveDocument.addObject("Part::Cylinder", "SuvCyl" + str(number))
    box.Radius = str(float(4)) + ' mm'
    box.Placement = App.Placement(App.Vector(-5, 7.5, number*3), App.Rotation(App.Vector(0, 1, 0), 90))

    cut = App.ActiveDocument.addObject("Part::Cut","ToolCut" + str(number))

    angle = 0
    if (number > 0):
        angle = 10
    stvolikObj.Placement = App.Placement(App.Vector(0, 0, 0), App.Rotation(App.Vector(0, 0, 1), angle))

    cut.Base = stvolikObj
    cut.Tool = box
    App.ActiveDocument.recompute()
    stvolikObj = FreeCAD.ActiveDocument.Objects[-1]

exportFile = "F:\jkhh1.stl"

_objs = []
_objs.append(FreeCAD.ActiveDocument.Objects[-1])
Mesh.export(_objs,exportFile.strip())

Basically it creates one "main" cylinder and tries to cut from it several small cylinders during loop. Cuts start from the bottom of main cylinder, first cut angle = 0. The problem is, the angle of first cut depends on the angle of next one, or last one, or whatever it decides.

angle = 10 https://imgur.com/a/A5z29Ix
angle = 20 https://imgur.com/a/Q7EYyGx
angle = 30 https://imgur.com/a/LSkPs0Z

It's like FreeCAD places last cut nicely (I used "view from behind (4)), so last cut always faces screen. But I need such behavior for first one.


OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13541 (Git)
Build type: Release
Branch: releases/FreeCAD-0-17
Hash: 9948ee4f1570df9216862a79705afb367b2c6ffb
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: Russian/RussianFederation (ru_RU)

[chrisb]

Moved to Python forum.

[fjod]

Moved to Python forum.

python is working as expected here

[fjod]

I tried to add cube to make my problem more clear

Code: Select all

import sys

sys.path.append("C:\\Program Files\\FreeCAD 0.17\\bin")
sys.path.append("C:\\Program Files\\FreeCAD 0.17\\lib")
import FreeCAD as App

import FreeCAD, FreeCADGui
FreeCADGui.setupWithoutGUI()
import Mesh
document = FreeCAD.newDocument("testDoc")
stvolikObj = App.ActiveDocument.addObject("Part::Cylinder", "Outer")
stvolikObj.Radius = str(float(8)/2) + ' mm'
stvolikObj.Height = str(float(30) + 2) + ' mm'

box3 = App.ActiveDocument.addObject("Part::Box", "TempBox")
box3.Width = str(5) + ' mm'
box3.Height = str(5) + ' mm'
box3.Length = '5  mm'
box3.Placement = App.Placement(App.Vector(0, 0, 20), App.Rotation(App.Vector(0, 1, 0), 0))


fus = App.ActiveDocument.addObject("Part::Fuse", "Fusion2")
fus.Base = stvolikObj
fus.Tool = box3

stvolikObj = fus

App.ActiveDocument.recompute()

for number in range(5):
    box = App.ActiveDocument.addObject("Part::Cylinder", "SuvCyl" + str(number))
    box.Radius = str(float(4)) + ' mm'
    box.Placement = App.Placement(App.Vector(-5, 7.5, number*3), App.Rotation(App.Vector(0, 1, 0), 90))

    cut = App.ActiveDocument.addObject("Part::Cut","ToolCut" + str(number))

    angle = 0
    if (number > 0):
        angle = 30
    stvolikObj.Placement = App.Placement(App.Vector(0, 0, 0), App.Rotation(App.Vector(0, 0, 1), angle))

    cut.Base = stvolikObj
    cut.Tool = box
    App.ActiveDocument.recompute()
    stvolikObj = FreeCAD.ActiveDocument.Objects[-1]

exportFile = "F:\jkhh1.stl"

_objs = []
_objs.append(FreeCAD.ActiveDocument.Objects[-1])
Mesh.export(_objs,exportFile.strip())

angle = 10 https://imgur.com/a/GFvRwrs
angle = 20 https://imgur.com/a/WM1HVsJ
angle = 30 https://imgur.com/a/lduXdbm

pay attention to axis in the right-down corner; it is different for each model, should be same.

[fjod]

ok I got it, I need to rotate it back on the sum of degrees

import sys

sys.path.append("C:\\Program Files\\FreeCAD 0.17\\bin")
sys.path.append("C:\\Program Files\\FreeCAD 0.17\\lib")


import FreeCAD as App

import FreeCAD, FreeCADGui
FreeCADGui.setupWithoutGUI()
import Mesh
document = FreeCAD.newDocument("testDoc")
stvolikObj = App.ActiveDocument.addObject("Part::Cylinder", "Outer")
stvolikObj.Radius = str(float(8)/2) + ' mm'
stvolikObj.Height = str(float(30) + 2) + ' mm'

box3 = App.ActiveDocument.addObject("Part::Box", "TempBox")
box3.Width = str(5) + ' mm'
box3.Height = str(5) + ' mm'
box3.Length = '5 mm'
box3.Placement = App.Placement(App.Vector(0, 0, 20), App.Rotation(App.Vector(0, 1, 0), 0))


#fus = App.ActiveDocument.addObject("Part::Fuse", "Fusion2")
#fus.Base = stvolikObj
#fus.Tool = box3

#stvolikObj = fus

App.ActiveDocument.recompute()

angleVar = 30

for number in range(5):
box = App.ActiveDocument.addObject("Part::Cylinder", "SuvCyl" + str(number))
box.Radius = str(float(4)) + ' mm'
box.Placement = App.Placement(App.Vector(-5, 7.5, number*3), App.Rotation(App.Vector(0, 1, 0), 90))

cut = App.ActiveDocument.addObject("Part::Cut","ToolCut" + str(number))

angle = 0
if (number > 0):
angle = angleVar
stvolikObj.Placement = App.Placement(App.Vector(0, 0, 0), App.Rotation(App.Vector(0, 0, 1), angle))

cut.Base = stvolikObj
cut.Tool = box
App.ActiveDocument.recompute()
stvolikObj = FreeCAD.ActiveDocument.Objects[-1]

stvolikObj.Placement = App.Placement(App.Vector(0, 0, 0), App.Rotation(App.Vector(0, 0, 1), -4*angleVar))


exportFile = "F:\jkhh1.stl"

_objs = []
_objs.append(FreeCAD.ActiveDocument.Objects[-1])
Mesh.export(_objs,exportFile.strip())

[fjod]

I'll post an explanation if someone will get stuck at this like me.
Cylinders are rotated as well as other things. But after cut/fuse it becomes new object with rotation = 0, so if one has several rotations, this person needs to calculate sum of angles and rotate result model back on it.

Sorry for some drama

[vocx]

I'll post an explanation if someone will get stuck at this like me.
...

Use code tags, not quote tags.