Mapping sticks onto a surface + force analysis + overlapping volume

@wesleyshe623 wrote:

Hi everyone. I am currently working on a design that has to do with surface mapping. Below is a sketch illustrating my idea.

Idea.jpg3014x2448 2.78 MB

The end design will look like the blue part of the above photo but in a 3-dimensional sense. So the idea is to map wooden sticks on the normals of a sphere surface, and only take a square part of it (top down) to create a hairy stick surface with circular curves on both ends of the blue part.

Currently, i am still playtesting with the size of the sphere (e.g. CB and AB), also experimenting how to join the wooden sticks together in real life (probably gonna use epoxy resin). As a result, I would like to get a parametric model of the design so I can adjust easily later on. Currently, I have the below questions and I hope I may find the answers here and put them together later.

Idea2.jpg891x1158 403 KB

1. Firstly is to do with the square surface of the sphere. Currently, when testing out the mapping in grasshopper, I first have to create a fixed shape in rhino. The downside of this is, of course, the fact that I cant adjust the CB and AB easily, not to mention the inaccuracy in modelling. Is there a way I might get the square shape (from top) surface of a sphere, and adjust the radius of the sphere and CB easily?

2. For some reasons I just couldn’t do the mapping using my grasshopper. Probably not because of the inaccuracy of the rhino model. I have tried using divide surface, iso trim and evaluate but none of them worked. What would be the best way to map the normals (with adjustable domains UV) on such a surface?

chair.jpg1702x1278 1.09 MB

3. In fact, the design i am working on is a rocking chair. the person will be sitting on the upper blue surface of the above photo. But since I probably wont be sitting on the centre of normal (nor my butt is a point), is there a way to do force/ pressure analysis using plugin like karamba? E.g. how the force will be concentrated as the person swings to the front or back so as to determine the proper length of the wooden stick. (I know this sounds extra but i really wanna get a glimpse of how karamba would work, so as a practice of using the extracted data).

Idea.jpg3014x2448 2.78 MB

4. Since the sitting surface should form a smooth surface, it is expected to have a lot of overlapping volume between the sticks. Is there a way for grasshopper to find identify them? kinda like bad edge detecting in rhino?

Thanks so much and I hope to hear from you soon.

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