placement transformation

[bernd]

Assumed:
- two identical wire
- made only from straight edges
- same start point
- the rest could be some how turned in 3D orbit

I would like to somehow save what is needed to move and turn one wire into the other. As input I only have the shapes of the wire.

Someone know how to do this?

[Chris_G]

This should do it :

Code: Select all

def get_relative_placement(shape1, shape2):
    "returns the placement that must be applied to shape1 to move it to shape_2"
    plane1 = Part.Plane(*[v.Point for v in shape1.Vertexes[0:3]])
    plane2 = Part.Plane(*[v.Point for v in shape2.Vertexes[0:3]])
    pl1 = FreeCAD.Placement(plane1.Position, plane1.Rotation)
    pl2 = FreeCAD.Placement(plane2.Position, plane2.Rotation)
    return pl2.multiply(pl1.inverse())

Assuming that the first 3 vertexes of the shape correctly define a plane (not coincident, nor colinear)

[bernd]

Great! Exactly what I need

Where did you get it from, or did you just coded it?

[Chris_G]

just coded

[bernd]

just coded

wow

how do I apply a relative placement to a object

obj.Placement = myRelativePlacment would set the Placement to myRelativePlacment and not apply myRelativePlacment on top of Placement AFAIK

[bernd]

Code: Select all

obj.Placement = myRelativePlacment.multiply(obj.Placement)

seams to do the trick