topic Re: 3D object skew transform in Fusion Support Forum

3D object skew transform

omidmostachfi — Sat, 11 Feb 2023 23:02:24 GMT

I have a complex 3D object that I've created. I'm wondering if there is a way in fusion 360 to do a transform on the object so everything is angled at 45 Deg along one axis. Mathematically, we'd have x'=x; y'=y+z; z'=z, see drawing below.

Note: I realize I can skew a 2D sketch at an angle by sweeping at 45 deg. What I'm looking for is how to transform an existing 3D object (the object is complex, not a simple cube, so redrawing it would be too difficult).

Re: 3D object skew transform

jhackney1972 — Sat, 11 Feb 2023 23:44:57 GMT

I am guessing the technique for doing this with a Cube will not be applicable to a more complex model since I am changing the angle of the cube internal sketch. Skewing a model directly I think will be hard in Fusion 360 since it does not have a "Stretch" command. Model is attached

(view in My Videos)

Re: 3D object skew transform

omidmostachfi — Sun, 12 Feb 2023 01:54:34 GMT

Thank you very much for the video. Unfortunately, my part includes numerous sketches at various angles, fillets, holes, threaded parts, so I need to apply a global transform. If that’s not an option in fusion 360, I wonder whether there are any other programs that could do this on an exported 3MF file?

Re: 3D object skew transform

TrippyLighting — Sun, 12 Feb 2023 11:40:07 GMT

The shear tool in Blender will do exactly that.

3MF is a format hosting triangulated meshes and is not a format that works well as design input to Fusiosn360.

To work with this format in Blender you'll first have to find a plugin that reads 3mf into Blender and install it.

Re: 3D object skew transform

omidmostachfi — Sun, 12 Feb 2023 16:07:59 GMT

That’s awesome. Thank you. My project is a native fusion 360 file so I can export it in whatever format Blender needs (I just said 3mf as an example).
Thank you for your help.

Re: 3D object skew transform

TrippyLighting — Sun, 12 Feb 2023 16:37:10 GMT

@omidmostachfi wrote:

... My project is a native fusion 360 file so...

Just be aware that to export it into Blender, you'll have to export it into a triangulated mesh format use. obj.

However, be advised that if you want to re-import the object into Fusion 360 and do further modeling work might be very difficult!

Re: 3D object skew transform

david.milan213 — Sun, 22 Dec 2024 12:25:43 GMT

I may be late to the party, but I'll leave this here since this was the first result I came across when searching for solutions.

According to linear algebra a skew transformation can be composed as the product of rotation and non-uniform scaling, which are available operations in Fusion 360. I have successfully aplied this for a decorative element where I could 'eyeball' these operations.

For a mathematically rigorous procedure I found this:
https://stackoverflow.com/questions/18362043/shear-matrix-as-a-combination-of-basic-transformation