Help Instantiating Ropes at runtime

[josemendez]

Hi, love the asset so far, great UX and really powerful!

I am doing fine with ropes that I author and place in the scene but am running into some issues/questions now that I'm attempting to instantiate them at runtime.

My usecase is that I have a Helium Balloon(rigidbody with up force applied) that spawns and attaches to other rigidbodies on collision. I want this attachment to be an Obi Rope to simulate the string of the balloon.
For that I would need to set the start and end nodes of a rope to the balloons position and the impact point respectively.

Do I need to create a blueprint at runtime for each of the ropes to do so? 

How do I know which index each particle group of a rope has?

Thanks for the great asset!

Hi there!

If you're going to create each rope at runtime, they will presumably have different lengths/shapes, so yes you should create a separate blueprint for each one. There's no downsides in doing this. Check out the included RopeGrapplingHook sample scene for some code that creates both blueprints and ropes programmatically (/Obi/Samples/RopeAndRod/SampleResources/Scripts/GrapplingHook.cs)

To retrieve the indices of the particles in a particle group, just do:

Code:

List<int> indices = rope.blueprint.groups[groupIndex].particleIndices;

In the case of ropes, particle groups only contain 1 particle each, so even though particleIndices is a List you can count on it having only one entry.

cheers!