How to model 2D rectangle with half circles (with continuity)?

[Anonymous]

I'm trying to model power and volume buttons for a mobile device, I didn't expect that it would take so much time to model such a simple shape, the shape should look like a pill from the side (or tall rectangle with half circles at its ends). Obviously it's easy without G2 or higher continuity, but to make it continuous it took me more than an hour messing around with it, I'm not sure if I did it right and if I can repeat the process without a lot of pain.

So yeah, I need an advice what would be the best strategy (or strategies) to achieve this shape? I tried adding a circle as a reference and doing curve filleting with G2 continuity on the rectangle, then deleting that fillet and doing free form blend, also tried manually editing CV points to be more similar to a circle.

I'm attaching an image of the shape I'm talking about (It's not continuous here but you get the idea).

[Anonymous]

Because Otherwise it will never really look Like a Slot. And thats what they were going for. The wanted it to have a mechanical feel but with a nice flowing shape.

And regarding the fillets. Dont have all fillets in exteriour and Interiour These Kind of requirements of minimal radii for pedastrian and passenger safety?
Please elaborate because i dont understand the question.
Do u mean Splitting the fillets in an Arc and two blendIng surfaces? What should be the Reason for that? Like i Said keeping the circle was just to archive a slot Like shape in a class a surface where a sharp g1 shape of a real Slot would look Too stiff.

But of Course there are also some occurences where you have to build fillets in this way because of tooling Reasons or Other restrictions Like a day time running Light Simulation Not giving an even Light Emission with a smaller Radius with Too much lead in in some steep corners or things Like that.

[Anonymous]

[duaxiong]

Yes, I mean "Splitting the fillets in an Arc and two blending surfaces"...as you are doing for your slot shape.  

Reason:  "to have a mechanical feel but with a nice flowing shape".

In any case, if it's purely an aesthetic slot, and not a screw hole with a specific radius requirement...compared to yours, I think mumblefluff's example in post #7 is better looking, easier to build (and modify), and has a better curvature plot;  It looks more "mechanical" to me because the straight edges are actually straight.

Anyway, it's all very subjective and maybe your OEM required this just because the guy in charge likes it that way, but I don't think there's anything technically wrong with either method.

[Anonymous]

Yes of course it has a better curvature comb as it is Not keeping a constant radius. But i included the picture to Show that the blend curve should not get a Bigger curvature than the circle it connects to. The connection itself can of Course be tweaked a little Bit to improve it.
And yes of Course it was because the Guy responsible For the Design Liked to keep a real circle for as long as possible on the sides. Which is exactly the topic of this thread.
And the Method used By the Starter of this thead is Not keeping a circle. And i just wanted to give a solution how to keep a circle. If he is happy with an elliptical shape instead of a circle that is Fine. But if he is giving himself the restrictions (for whatever Reasons) that it should be a circle then his solutions is Not working