|Draft → PathArray|
To position copies in an orthogonal array use Draft Array; to position copies at specified points use Draft PointArray; to create copies or clones, and manually place them use Draft Move, Draft Rotate, and Draft Clone.
Object arranged along a path
How to use
- Select an object that you wish to distribute.
- Select a path object or some edges along which the object will be distributed.
- Press the button.
- The Array object is immediately created. You must change the properties of the array to change the number and direction of copies created.
Each element in the array is an exact clone of the original object, but the entire array is considered a single unit in terms of properties and appearance.
The base object should be centred around the origin, even if the path starts somewhere else.
There are no options for this tool. Either it works with the selected objects or not.
- DataBase: specifies the object to duplicate in the path.
- DataPathObj: specifies the path object.
- DataPathSubs: specifies the sub-elements (edges) of the path object. This property does not yet appear in the property editor.
- DataCount: specifies the number of copies of the base object.
- DataAlign: if it is
truethe copies are aligned to the path; otherwise they are left in their default orientation.
- Note: in certain cases the shape will appear flat, in reality it may have moved in the 3D space, so instead of using a flat view, change the view to axonometric.
- DataXlate: specifies a translation vector (x, y, z) to displace each copy along the path.
- Note: when DataAlign is
true, the vector is relative to the local tangent, normal or binormal coordinates; otherwise the vector is relative to the global coordinates.
PathArray = makePathArray(baseobject, pathobject, count, xlate=None, align=False, pathobjsubs=)
- Creates a
PathArrayobject from the
baseobject, by placing as many as
pathobjsubsis given, it is a list of sub-objects of
pathobject, and the copies are created along this shorter path.
xlateis given, it is a
FreeCAD.Vectorthat indicates an additional displacement to move the base point of the copies.
Truethe copies are aligned to the tangent, normal or binormal of the
pathobjectat the point where the copy is placed.
import FreeCAD,Draft p1 = FreeCAD.Vector(500, -1000, 0) p2 = FreeCAD.Vector(1500, 1000, 0) p3 = FreeCAD.Vector(3000, 500, 0) p4 = FreeCAD.Vector(4500, 100, 0) spline = Draft.makeBSpline([p1, p2, p3, p4]) object = Draft.makePolygon(3, 500) PathArray = Draft.makePathArray(object, spline, 6)
Technical explanation for the Align property
When DataAlign is
false, the placement of the copied shapes is easy to understand; they are just moved to a different position in their original orientation.
Object arranged along a closed path in the original orientation
When DataAlign is
true, the positioning of the shapes becomes a bit more complex:
- First, Frenet coordinate systems are built on the path: X is tangent, Z is normal, Y is binormal.
- Then the original object is copied to every on-path coordinate system, so that the global origin is matched with the on-path coordinate system origin.
Object arranged along a closed path; description of components and path
The following images show how the array is produced, depending on which plane the path is.
Path on XY Plane:
Object arranged along a closed path which is aligned to the XY plane
Path on XZ Plane:
Object arranged along a closed path which is aligned to the XZ plane
Path on YZ Plane:
Object arranged along a closed path which is aligned to the YZ plane
As you reorient the path but not the object, the result is consistent: the object remains aligned to the path the way it was before reorienting the path.
Editor: thank you to user DeepSOIC for this explanation.