How can build out physical torus, such as basketry, the ball can pass in the middle or collide with it

Questions
1

How can build out physical torus, such as basketry, the ball can pass in the middle or collide with it.

2

There are some examples with physics. Maybe they’ll give you a clue:
https://threejs.org/examples/?q=physics#webgl_physics_terrain

3

I’m not sure but it seems that ammo.js does not provide a torus collision shape. That might be a problem for @duanleon if he is going to work with this physic engine.

4

We have Physijs :slight_smile:

5

I think I would not use a physic engine at all but develop a more simple approximation like in this example:

https://threejs.org/examples/webvr_daydream.html

The code does not illustrate a collision detection between a torus and a sphere but the idea to work with velocity in order to simulate movement and collision. Check out the implementation of the render function.

6

Thank you very much, @Mugen87 and @prisoner849. From your comments, I understand:

  1. physic engine cannot support torusMesh;
  2. There are two potential solutions: one is velocity and another one is concave shape decomposition algorithm. I will research these two topics and try to find out solution.
    Will be back once I get solution.
    Thanks again!
7

Finally, I use many physical Cylinder to simulate the torus, it works, although not very perfect…
Thanks for your help again!

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