tangent curvature handle vs Tangent Smooth constraint - how to use best?

[cekuhnen]

Coming from Alias / Rhino getting a hand of the tangent/smooth handle/constraint is a little bit of a challenge to be honest.

Can somebody very family with that workflow explain how to use it best?

Here is a video how I work in Alias and then try to transfer that understanding to Fusion.

https://drive.google.com/open?id=0Byzv_NlyKp_2ZEtrM1JzeHZSZVU&authuser=0

My biggest problems are:

1. Fusion has no blend curve meaning a cuve that is not influencing the target curve/curves when editing

2. the G1G2 handles seem to conflict with the G1G2 constraint

When working with CVs seeing and managing G1G2 is pretty easy in Alias

In Fusion I seem not to get the hang of it.

There are also multiple other UI or tool bugs and artifacts you can see like:

G1 constraint by default being more bellied out, while G2 constraint by default has a flatter curve

Constraint handle I often cannot activate

Constraint handle have UI artifacts which make no sense - must be a bug

For me it seems that the lack of a true blend curve really is a draw back and the constraint/handle issue

making working and sculpting nice curves actually very painful to me at least to a degree that I do not want

to make transitions between curves at all in Fusion

[jiang_peng]

Hi Claas, Thanks for the video.

There are three known bugs in your video. One is dragging the connecting point of 2 splines with smooth constraint; the smooth constraint will be violated. The second is the fixed spline with smooth constraint, dragging connected spline's tangent handle will violate smooth constraint. The last one is the abnormal behavior of curvature handle. We are trying to fix these bugs but unfortunately some of them are not very easy.

[jiang_peng]

One more thing, if you already connect a spline to other curve, and add smooth constraint at the connect point. The curvature handle will be no longer activate-able.

[cekuhnen]

Thank you for the information. I feel kinda silly asking all this normally I soak this up quickly.

It might be a good idea to create a PDF or video about how sketches work with tangent handle and constraints. I this area is hard to grasp the differences by trial and error.

Claas

[jiang_peng]

Personally I think if we need the "Blend" curve like Alias, CV spline probably is a better solution.

CV spline is on the "TODO" list but not very high priorty...

[cekuhnen]

I don't know why CVS are not high on the list for curves. The sound system is complicated and had many bugs making certain work flies very hard to frustrating.

I like splints for certain shapes but I feel for others they don't for well in the current version.