How would you model this weird organic building in Fusion 360?

[copumpkin]

I saw this interesting proposed building: https://mymodernmet.com/sarcostyle-tower-nyc/

And was tempted to try to model it in Fusion 360. I've never used forms before and it looks like it came right out of the Form environment.

Here's what I did:

1. Enter the Form environment and create a box
2. I make a box of approximately the right dimensions, with 7 segments in each of the three axes
3. Use the Bridge tool to highlight a 3x5 range of faces on both sides of the box and tell it I want 7 segments, to get a hole running through in one direction
4. Use the Bridge tool twice more to cut through in the other direction
5. At this point I have a very rounded box with a hollow inside and four "columns", one on each corner
6. Pick two faces on the inside of one of the columns, right click, then "Erase and Fill" on each to "merge" them, so I get a pair of opposing faces that roughly approximate where the inner protrusions start crossing the interior space
7. Pick the Bridge tool again on those opposite interior faces to get the protrusions to cross properly

But when I get to #7, I find that the Bridge tool really wants to either "twist" or make my beautiful curves super blocky. I assume the blockiness is if the Bridge tool somehow creates a self-intersecting curve due to the twistiness.

I've attached a picture of the basic model I get from the above.

I have three big questions, plus a bonus:

1. Am I on the right path to model a weird organic shape like this? I'd welcome better approaches as I'm still learning Fusion 360
2. How can I prevent the twists in the inner protrusions? I tried playing with the twist parameters and inverting directions in the Bridge tool but I couldn't get anything to keep things straight. The twists also look neat but my goal is learning
3. How do I prevent blockiness in general? Is there a term for that? It's been very hard to even google what's happening when the form loses its curves
4. [Bonus] I decided to try my luck creating toolpaths for carving my twisty creation described above: I figured I'd try an indexed rotary approach, so I created a circular pattern in the manufacture workspace around the long axis of the shape. Then inside the pattern I used an adaptive 3d clearing toolpath with a height limit. This generated a toolpath that looks completely wrong, seemingly adding inner protrusions in the same orientation from each of the 4 indexed positions. I've attached a screenshot of what I mean as well as the full file. Am I doing something wrong or is Fusion 360?

Thanks!

[laughingcreek · Accepted solution]

as far as the twist in the bridge goes, there's a couple of alignment vectors that are probably not set right.  you click on the vertex's you want to have line up, and make sure the arrows are going the right way-

this second pic is how the bridge in the attached was formed. 

[copumpkin]

Thanks! But I don't seem to be able to get those arrows pointed in the direction you have them pointing. When I click on the arrows they switch between two positions (that also match the "flip direction1/2" checkboxes) and those directions only seem to move in the other axis. Is there something I did to make mine stuck in the other plane?

[copumpkin]

Oh, my bad, I didn't realize I could click on other vertices to move the arrows around. Got it now!

Any thoughts on the toolpath issue?

[copumpkin]

I posted a more detailed question on the toolpath issue over in the manufacturing forum: https://forums.autodesk.com/t5/fusion-360-manufacture/circular-pattern-on-irregular-shape/td-p/10870...