How is automatic wire routing calculated?

[oyvindTMNSU]

I hope someone can answer this question. 

• How is the wire and harness automatic routing calculated in inventor? Is it based on regular splines? I that case, how is the min bend radius calculated? As far as I know it's difficult to set/check  radiuses on splines. Or am I missing something? Interested because Fusion 360 ,that I use every day , don't have this functionality, but Fusion has a nice open API, so maybe its possible to write a code for a simple version.

[chenj]

Hi,

In Inventor cable and harness environment, you can set the default bend radius for wires or cables.You can also check the routing radius manually after bending.

[oyvindTMNSU]

Yes I know this. But what I am interested in is how the bend radius is calculated "behind the scenes". Like in the programming side of it. 
Jut don't quite get how the radius of a spline is calculated