tangency problem with loft rail

[cekuhnen]

In rhino the model is clean perfect tangency along mirror axis center

Fusion has a terrible G0 postion along the profile.

[cekuhnen]

Here are two screencasts first showing what fusion only can do and what rhino can do.

Here is the Fusion Video - the surface is useless.
https://drive.google.com/file/d/0Byzv_NlyKp_2ZW5Hc1EycUdGU1E/edit?usp=sharing

Here is the Rhino Video - thats a surface I can work with:
https://drive.google.com/file/d/0Byzv_NlyKp_2RnNHUFNtTTlKTlk/edit?usp=sharing

[jakefowler]

Hi Claas,

I’m afraid we don’t yet have a tool that can build the surface you’re after without a bit of extra work. Loft doesn’t guarantee to maintain tangency constraints that aren’t specifically set: the tangency at this rail is implied, but not specified. My recommendation would be to build both halves together as a single loft, which will guarantee smoothness across the mirror plane (then split the body in half if you only want to work on one side). If you want to build this as a single half, the best way to achieve this for now is to extrude some construction surfaces from the rails, and apply G1/G2 conditions to these. 

We do have plans to enhance our surfacing tools in future, but currently we’re still working on getting our full set of existing tools into the parametric environment. Keep the IdeaStation requests coming, we really appreciate your contributions here (we haven’t got round to reviewing these all yet, but we will do soon!).

Get in touch if you have any more questions about this,

Jake

[cekuhnen]

Hi Jake,

I was actually not able to build the shape at all with all tricks in Fusion.
Extruding a side surface for a guide destroys the circular profile cross section.

The only way to do it is to build as you mentioned the form as a full not half model.

I hope the idea station suggestions provide a good idea about what I as a designer would need to be really able to replace Rhino / Alias with Fusion.
Currently too much is so often missing even basic tools like rotate or how loft operates everywhere else with Rails.

At the moment for me Fusion is a lot of guess working and crossing fingers to hope something might work or is implemented.

Looking forward to the surface tools enhancements.