Macro Align View to Face

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Revision as of 09:51, 8 October 2022 by FuzzyBot (talk | contribs) (Updating to match new version of source page)

Macro Align View to Face

Description
This macro aligns the current view to a selected face

Macro version: 3.0
Last modified: 2022-10-08
FreeCAD version: All
Download: ToolBar Icon
Author: Rockn
Author
Rockn
Download
ToolBar Icon
Links
Macro Version
3.0
Date last modified
2022-10-08
FreeCAD Version(s)
All
Default shortcut
None
See also
None

Description

This macro rotates the current view to point perpendicularly at a selected face of an existing object.

Usage

  1. Select a face on an object
  2. Run the macro

Script

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Macro_Align_View_to_Face.FCMacro

# -*- coding: utf-8 -*-
# Set the current view perpendicular to the selected face
# Place la vue perpendiculairement a la face selectionnee
# 2013 Jonathan Wiedemann,
# 2016 Werner Mayer, 
# 2022 tchernomax, https://forum.freecadweb.org/viewtopic.php?p=630019#p630019
#
__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__ = "3.0"
__date__    = "2022/10/08"  #YYYY/MM/DD
#
from pivy import coin

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

sel=Gui.Selection.getSelectionEx()[0]
obj=sel.Object
face=sel.SubObjects[0]
dir = face.normalAt(0,0)
cam = FreeCADGui.ActiveDocument.ActiveView.getCameraNode()

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))

def computeRotation(obj):
    if not obj.Parents:
        # the object has no parent
        return obj.Placement.Rotation
    # the object has parent
    # we compute the rotation of it's parent and multiply it with it's rotation
    return parentRotate(obj.Parents[0][0]).multiply(obj.Placement.Rotation)

if obj.Parents:
    obj_par = obj.Parents[0][0]
    rot_par = computeRotation(obj_par)
    cam.orientation.setValue(rot_par.multiply(rot).Q)
else:
    cam.orientation.setValue(rot.Q)

Gui.SendMsgToActiveView("ViewSelection")