Help Is it possible to implement a feature like in the video with Obi Rope?

[twocomet]

Hello,

I’d like to implement something similar to the elastic mechanical arms used by Spider-Man’s enemies, as shown in the video, using Obi Rope.
https://www.youtube.com/watch?v=E9deoUbX...&index=353

It seems like I could achieve this by controlling the minimum length limit, elasticity, and gravity, but the arms must not get tangled with each other.
From what I remember, Obi Rope has difficulties with very short ropes and becomes heavier the more ropes are used.

If this feature is used by monsters and there are dozens of monsters on screen, will performance issues be manageable?
Also, could you provide me with a sample project that demonstrates this functionality?

[josemendez]

Hi!

From what I remember, Obi Rope has difficulties with very short ropes and becomes heavier the more ropes are used.

Obi has difficulties with very long ropes, since they have more particles, thus requiring finer temporal resolution to be solved. The more *particles* you use and the more *often you update the simulation*, the costlier it becomes. Simulating 10 ropes with 100 particles each costs roughly the same as simulating 100 ropes with 10 particles each, since the amount of particles and constraints is the same.

If this feature is used by monsters and there are dozens of monsters on screen, will performance issues be manageable?

It's not possible to tell right away. Depends on how many dozens of monsters we're talking about, the level of simulation and rendering quality that's acceptable, the hardware you're targeting, whether this will run in the CPU or GPU (which in turn depends on whether your game is GPU or CPU bound), and many other unknown factors.

Also, could you provide me with a sample project that demonstrates this functionality?

This is a complex use case that would take a considerable amount of time to implement, so sadly I can't.

kind regards,

[chenji]

If this feature is used by monsters and there are dozens of monsters on screen, will performance issues be manageable?
Also, could you provide me with a sample project that demonstrates this functionality?

Firstly you're able to disable the script of the monster (or Obi solver) that is invisible on camera to increase performance.
Secondly you don't need add multiple Obi ropes for every arm for monsters. Just use animation is fine since player will not see the difference. So at most 1 Obi Rope for one monster is enough, which is used to attack/interact with user.
You only need more Obi ropes for those that can be clearly seen (in most cases controlled by the player) by the game player.