Projecting curve onto face

[DeepSOIC]

pojection-quick-test.png (15.2 KiB) Viewed 1571 times

Code: Select all

>>> sph=App.ActiveDocument.Sphere.Shape
>>> sph.makePerspectiveProjection(App.ActiveDocument.Sketch.Shape,App.Vector(0,0,0))
<Shape object at 00000081E33641F0>
>>> prj=sph.makePerspectiveProjection(App.ActiveDocument.Sketch.Shape,App.Vector(0,0,0))
>>> Part.show(prj)

EDIT: result is rather strange. 8 wires, which correspond to edges of sketch projected onto close and far surfaces... Needs filtering.

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Selected document object:
  Name = Shape
  Label = Shape
  Is Lattice = False
Structure: 
Compound (8 objects):
    Wire (1 segments)
    Wire (1 segments)
    Wire (2 segments)
    Wire (1 segments)
    Wire (1 segments)
    Wire (1 segments)
    Wire (1 segments)
    Wire (2 segments)

[DeepSOIC]

Further investigation.

projection-quick-test-numbered.png (25.01 KiB) Viewed 1564 times

projection-quick-test.FCStd

(69.36 KiB) Downloaded 84 times

The numbers next to sketch show its edge numbering. Numbers next to projection are indexes of wires (some wires are split into two edges by interference with sphere's seam edge).

Edges are BSplineCurves.

[ujjwal]

Thank You DeepSoic,

I am attaching two files to elaborate my problem.

PROJECT.FCStd

(10.79 KiB) Downloaded 83 times

Is the base state from where i will start. The two dimensional shape has the same length along the y-axis as that of the arc length of the toroidal surface.

EXTRUDE.FCStd

(19.68 KiB) Downloaded 55 times

If i do the simple extrusion, I am unable to get the desired SOLID, as the extrudate is falling out side the revolved toroid.

Regards
Ujjwal

[nmt]

Hello,
I am getting similar results. In the attached images, I project a face unto a cylinder. Both sit on the XY-plane. So, in addition to two projections on the near and far surfaces, I am getting a projection on the bottom of the cylinder. I cannot filter the resulting wires because their edges are not logically grouped. In this example, I get two wires. The first wire has 7 edges (highlighted in green) and the second wire has 1 edge (in black on the bottom face). Any help in resolving this is much appreciated.

Code: Select all

import Part

doc = FreeCAD.newDocument('NMT-Explode')
Gui.ActiveDocument.ActiveView.viewAxonometric()


# CREATE A FACE
v1 = App.Vector(7.0,-0.5,0.0)
v2 = App.Vector(7.0,0.5,0.0)
v3 = App.Vector(7.0,0.5,2.5)
v4 = App.Vector(7.0,-0.5,2.5)
edge1 = Part.makeLine(v1, v2)
edge2 = Part.makeLine(v2, v3)
edge3 = Part.makeLine(v3, v4)
edge4 = Part.makeLine(v4, v1)
wire = Part.Wire([edge1,edge2,edge3,edge4])
face = Part.Face(wire)
Part.show(face)

# CREATE A CYLINDER
cylinder = Part.makeCylinder(4,6,App.Vector(0,0,0))
Part.show(cylinder)
doc.ActiveObject.ViewObject.Transparency=50

# PROJECT EVERY WIRE IN FACE UNTO THE CYLINDER
for w in range(len(face.Wires)):
	projection=c.makeParallelProjection(face.Wires[w], App.Vector(-1,0,0))
	Part.show(projection)

Gui.SendMsgToActiveView("ViewFit")

ProjectFaceOnCylinder.png (47.35 KiB) Viewed 1286 times