topic Re: spline tool type in Fusion Design, Validate & Document Forum

spline tool type

Anonymous — Sun, 21 Nov 2021 23:31:32 GMT

Just curious to know what type of spline f360 is using for the spline tool? is it a cubic bezier curve? a f-spline curve? catmul spline? or something else?

thanks

Re: spline tool type

TrippyLighting — Mon, 22 Nov 2021 00:12:13 GMT

NURBS

Here's a good introduction on how to work with NURBS surfaces.

In Fusion 360 there are two spline types. The fit point splines are 5-degree multi-span splines.

Then there are control point splines. See the Autodesk Alias Theory Bulders on that (2nd link above)

Re: spline tool type

Anonymous — Mon, 22 Nov 2021 00:27:28 GMT

so it is a b-spline type. Whats the difference between non-uniform b spline and uniform b spline?

thanks

Re: spline tool type

TrippyLighting — Mon, 22 Nov 2021 00:39:10 GMT

Described here in the properties section.

Edit: Just to be clear, I don't claim to understand all the blinding math behind it 😉

Re: spline tool type

Anonymous — Mon, 22 Nov 2021 04:29:18 GMT

its all good, i can understand the maths a wee bit. Thanks for helping me out. I use another cad program as well, and i was just comparing the splines between all the different software out there. Looks like different types of splines have different places of where they put the control points. IE, on a uniform b-spline, the CV's are off of the curve, while with cubic beizer curve, the cv's are on the curve.

thanks