Help Obi 7.0 ParticleAPI

[josemendez]

seems like i have no idea on how to convert from solver to world space. my corss areas are in the solver hierarchy.

Vector spaces are critical stuff to understand when working with any game engine, since all engines are full of them and use them constantly: object, local, world, camera, viewport, screen, etc. Unity has built-in methods to convert data between spaces. To convert a position from local to world space, use TransformPoint.

Here's your code after fixing all issues:

- Use world space for everything.
- Stop looping once you find a particle inside, don't overwrite a variable each iteration.
- Only check active particles.

Assuming crossArea.bounds is expressed in world space (it will if crossArea is a collider, as per the documentation), this will return true if any particle in the rope is inside the bounds, and false otherwise.

Code:

bool IsRopeInsideCrossArea()
    {
        if (rope.isLoaded)
        {
            for (int i = 0; i < rope.activeParticleCount; ++i)
            {
                int solverIndex = rope.solverIndices[i];
                Vector3 particlePos = rope.solver.transform.TransformPoint(rope.solver.positions[solverIndex]);
                Debug.Log($"particle {solverIndex} position {particlePos}");
          
                if (crossArea.bounds.Contains(particlePos))
                    return true;
            }
           
        }
        return false;
    }

Let me know if you need further help