(25-07-2024, 03:07 PM)Ferhat123 Wrote: Hi,

I want to attach gameobjects to the ends of both ropes after tearing them apart. I want to do this every time I tear up any rope.

I guess I can't add control points at runtime to attach these gameobjects, so maybe the solution is to generate two separate ropes at runtime when I cut the original rope.

How can I do it?

Thank you,

(25-07-2024, 05:28 PM)Ferhat123 Wrote: Thank you for your answer.

I tried your suggestion. I'm encountering a strange situation as shown in the video I shared.

https://drive.google.com/file/d/1Bd3HLS5xBtRxDEIHhebVYXoB2p4rWVKI/view?usp=sharing

As shown in the video, there is a yellow cylinder that is already attached. After cutting, I attach one cylinder to the end of the rope fixed to the wall and another cylinder to the beginning of the falling piece.

Here is my code:

Code:

private void ScreenSpaceCut(Vector2 lineStart, Vector2 lineEnd)
{
    // keep track of whether the rope was cut or not.
    bool cut = false;
    int leftParticles = -1;
    int rightParticle = -1;

    // iterate over all elements and test them for intersection with the line:
    for (int i = 0; i < rope.elements.Count; ++i)
    {
        // project the both ends of the element to screen space.
        Vector3 screenPos1 = cam.WorldToScreenPoint(rope.solver.positions[rope.elements[i].particle1]);
        Vector3 screenPos2 = cam.WorldToScreenPoint(rope.solver.positions[rope.elements[i].particle2]);

        // test if there's an intersection:
        if (SegmentSegmentIntersection(screenPos1, screenPos2, lineStart, lineEnd, out float r, out float s))
        {
            leftParticles = rope.elements[i].particle1;
            rightParticle = rope.elements[i].particle2;
            cut = true;
            rope.Tear(rope.elements[i]);
        }
    }

    // If the rope was cut at any point, rebuilt constraints:
    if (cut)
    {
        rope.RebuildConstraintsFromElements();
        obiTest.AddNewSolidModel(leftParticles, rightParticle);
    }
}

Code:

public void AddNewSolidModel(int leftParticle, int rightParticle)
{
    AttachSolidModel(leftParticle, "Left");
    AttachSolidModel(rightParticle, "Right");
}

private void AttachSolidModel(int particle, string groupName)
{
    var go = Instantiate(solidModel);
    go.transform.position = rope.solver.positions[particle];
    go.transform.rotation = transform.rotation;

    var group = ScriptableObject.CreateInstance<ObiParticleGroup>();
    group.particleIndices.Add(particle);
    group.name = groupName;

    var particleAttachment = gameObject.AddComponent<ObiParticleAttachment>();
    particleAttachment.particleGroup = group;
    particleAttachment.attachmentType = ObiParticleAttachment.AttachmentType.Dynamic;
    particleAttachment.target = go.transform;
}