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Are you sure that double clicking a Bridge Curve would bring up studio spline dialog box, not a Bridge Curve dialog box?
I think that you might mean extracting the Bridge Curve to get a Studio Spline.
I'm thinking about whether Bridge Curve provides manipulators for controlling pole 2 and pole 3 separately. Thanks!
I didn't see anything in your link to the Alias tips that stated you have direct control over any poles (apparently called CVs in Alias) using the Blend Curve tool. I believe those indicators are shape controls, which indirectly control the pole position based on the continuity assigned to the curve and how the manipulators are positioned. I don't see this being (possibly) any different than using Bridge Curve and rather than using Tangent Magnitude, using Depth and Skew options but it's hard to guess since there wasn't a specific example showing how the Alias manipulators could be used.
The Bridge Curve Depth controls how sharp or flat the Bridge Curve will be and Skew controls to which side the Bridge Curve will lean. Changing either of these settings "should" indirectly manipulate the poles (CVs) on the Bridge Curve because you're increasing and decreasing tangency or curvature, which means you're moving the poles (CVs) as well because the curve shape is changing. The poles will only move along the tangency (angle) because if they were to move to the right or left side of the parent curves, this would break the continuity. You can see this if you turn on Show Poles while you're creating the Bridge Curve. I would assume the Alias manipulators would behave the same way.
You could do the same things using Studio Spline, but it's usually a bit simpler with Bridge Curve.
Hi @TimF Thank you for the long reply!
Bridge Curve has two modes of shape control:
For each modes, there are 2 manipulators for the shape control.
Alias' Blend Curve has two manipulators (a rectangular box and a circular box) for both the start and the end. Therefore it has 2*2 manipulators for shape control. And for a degree 5 blend curve, each pole can be separately moved.
Do you have Alias installed?
If you wish to have that sort of control, use Studio Spline like I stated earlier. Set Studio Spline to By Poles, G2 at each end and 5 degree, single segment. You can then either infer the contuity or control it via Specify Constraints (manipulators).
Inferred G1, G2 or G3 will "auto align" the poles for the optimal shape and lock them into the same alignment/angle as the parent curve on that side. Using MB3 -> Specify Constraints on the start or end pole will allow you to deviate from the "optimal" shape. Play with it a bit to see what I mean regarding the Specify Constraints. The manipulator route will not update if you change the parent curves as far as G1-G3 continuities....you will have to respecify those.
I don't have access to Alias. I simply studied their official tutorials.
Your reply makes me realize that Studio Spline should be used for full control of pole structures and Bridge Curve is basically an easy version of Studio Spline. Thank you so much!