Wrapper

[Shor-ty]

Hey everybody,

I am wondering if Freecad offers some kind of wrapper around an STL, or other CAD file? For example: I do have a CAD geometry of some radiator and I want to have only the outer surface (so wrapping a box around the radiator). At the end, I have a wrapped geometry that represents the outer shell of the object (without any holes).

Tobi

[chrisb]

You can turn the stl into a solid and subtract it from e.g. a cube. Then the cut is a wrapper around the original stl.

[Roy_043]

I think the OP wants a convex hull (shrink wrapped) type solution.

[Shor-ty]

Hey everybody,

exactly as @Roy_043 mentioned. The geometry is, e.g., a raw TV housing with all the cooling channels and so on. I want to wrap around the geometry to get a closed volume that fits the TV housing well (e.g, closing the cooling channels etc.).

Is there any solution? Probably I could do it using Blender.

[wmayer]

Assuming you have loaded a mesh file then with the script below you can create a fitting box

Code: Select all

import Mesh

mesh=App.ActiveDocument.ActiveObject.Mesh.copy()

eigen = mesh.getEigenSystem()
mesh.transformGeometry(eigen[0])

bbox = mesh.BoundBox
triangles = []
triangles.append(bbox.getPoint(0))
triangles.append(bbox.getPoint(1))
triangles.append(bbox.getPoint(2))
triangles.append(bbox.getPoint(0))
triangles.append(bbox.getPoint(2))
triangles.append(bbox.getPoint(3))
triangles.append(bbox.getPoint(0))
triangles.append(bbox.getPoint(5))
triangles.append(bbox.getPoint(1))
triangles.append(bbox.getPoint(0))
triangles.append(bbox.getPoint(4))
triangles.append(bbox.getPoint(5))
triangles.append(bbox.getPoint(0))
triangles.append(bbox.getPoint(3))
triangles.append(bbox.getPoint(7))
triangles.append(bbox.getPoint(0))
triangles.append(bbox.getPoint(7))
triangles.append(bbox.getPoint(4))
triangles.append(bbox.getPoint(4))
triangles.append(bbox.getPoint(6))
triangles.append(bbox.getPoint(5))
triangles.append(bbox.getPoint(4))
triangles.append(bbox.getPoint(7))
triangles.append(bbox.getPoint(6))
triangles.append(bbox.getPoint(1))
triangles.append(bbox.getPoint(6))
triangles.append(bbox.getPoint(2))
triangles.append(bbox.getPoint(1))
triangles.append(bbox.getPoint(5))
triangles.append(bbox.getPoint(6))
triangles.append(bbox.getPoint(2))
triangles.append(bbox.getPoint(7))
triangles.append(bbox.getPoint(3))
triangles.append(bbox.getPoint(2))
triangles.append(bbox.getPoint(6))
triangles.append(bbox.getPoint(7))

box = Mesh.Mesh(triangles)
box.transformGeometry(eigen[0].inverse())
Mesh.show(box)

Is this what you are looking for?

If you have a recent build that includes git commit 2808c4bc you can simplify the script:

Code: Select all

import Mesh

mesh=App.ActiveDocument.ActiveObject.Mesh.copy()

eigen = mesh.getEigenSystem()
mesh.transformGeometry(eigen[0])

box=Mesh.createBox(mesh.BoundBox)
box.transformGeometry(eigen[0].inverse())
Mesh.show(box)