Projecting from sketch to 3d

[Anonymous]

Hi

I've been trying to create frames for glasses, with a seamless top line going all the way across the front and then around the corner and along the temples. I was hoping to do this based on sketches. But once I project from the front, and then I project from the side, I can't connect the two pieces in a seamless way:

 

I also tried with 3d sketching, but then I can't project, as far as I know.

Am I approaching this completely the wrong way?  Should I be doing this with T-splines instead? But wouldn't that give me much less smooth curvatures? I come from Illustrator, that's why the sketching concept is somewhat more familiar to me.

Here's the link to the file:  http://a360.co/2oZ45rK 

Any help is much appreciated, thanks in advance.

cheers

Bernie

[robduarte]

This seems like a very difficult path to what you're trying to do. I would recommend giving T-splines a try. I have had several students (total beginners to Fusion 360) take this approach for making glasses, specifically, with really good results. Don't forget to use mirroring so you're modeling two halves at once.

[Anonymous]

Thanks Rob for your answer. Though I was hoping to a solution with sketches, I will focus on T-splines. 

cheers, Bernie

[laughingcreek]

It's a bit tricky, but doable to use "sketch-project|include-intersection curves".  See attached for example based on your file.

[laughingcreek]

here's an example tspline approach.

[Anonymous]

Hi laughingcreek

Many thanks for your reply and suggestion. I checked out your example. Unfortunately it has the same flaw as what I was able to do previously: you projected your example from the front, which is fine, as long as the temples of the glasses bend perpendicular to the front. But usually there is a slight angle between front and temples:

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Here you can see that the transition between the front part and the temple is not smooth, once the temple is not perpendicular to the front anymore: 

I guess the T-splines is the only way at this stage. Anyway, I do appreciate it very much, that you took the effort to even send me an example file.

Happy easter and cheers

Bernie

[laughingcreek]

projecting from multiple directions to get a smooth 3d curve is still doable (the original question), even with the added requirements for conditions at the temple.  see attached.  look at sketches "project for front" and "project for ear".  it gets tricky though.  (I put an extreme angle change just for emphases.)

T-splines may still be the easier way to go.  The topology of my original t-spline example is a bit off, can repost a better example if you want to go that route

[Anonymous]

Hi laughingcreek

Fantastic, thanks very much. This looks very promising. Can you tell me a bit more about the steps you took? 

I understand that you did the following rough steps:

1) you projected from the front onto the bent surface

2) you created a second sketch from the side:

- But how did you actually get it to connect so smooth to the front?

- Is the trick to use curvature on the connectors? But how do you put it on in the first place? I removed it, but can't get it back on, Fusion360 throws me an error!

3) then you projected onto the side

Is this right?

Many thanks and cheers

Bernie

[laughingcreek · Accepted solution]

here's a screen cast of just connecting 2 lines. (sorry, it's a bit rough)

-intersect project from one side first (the "front" in this case)

-then draw your side profile.  regular project onto the sketch the result from the last step, and put a smooth constraint on it.

-no project the side.

reading that doesn't make much sense, but hopefully the screen cast will.

[Anonymous]

Hi laughingcreek

Thanks so much. I will try your solution, but it seems to be pretty much like what I was looking for.

Great work, cheers

Bernie