(25-11-2021, 05:32 AM)Hlibs Wrote: Hi
I've been using raycasting to find specific point on obi rope where the player is watching and can get it's index and position
Can I get normalized position mu out of it somehow?

(25-11-2021, 08:39 AM)josemendez Wrote: Hi there!

Do you mean normalized coordinate along the raycast, or along the rope? Also, are you using surface collisions?

Along the raycast, mu = result.distance / maxDistance;

Along the rope, assuming you use surface collisions the raycast query returns the index of the simplex hit. You have to traverse a couple data structures to get the mu along the rope:

- Get the particle indices of the simplex:

Code:

int simplexStart = solver.simplexCounts.GetSimplexStartAndSize(result.simplexIndex, out int simplexSize);
int firstParticle = solver.simplices[simplexStart];
int secondParticle = solver.simplices[simplexStart+1]; // always 2 particles in a rope simplex.

- Look for the rope element that references these particles, and once you find it just divide its index by the amount of elements:

Code:

for (int i = 0; i < rope.elements.Count; ++i)
{
if (rope.elements[i].particle1 == firstParticle && rope.elements[i].particle2 == secondParticle)
return i / (float)rope.elements.Count;
}

You could get a finer result by considering the hit position along the current element's length, and adding that to the resulting mu value.

kind regards,

(25-11-2021, 10:19 AM)Hlibs Wrote: Along the rope, yes
Thank you, it's working great now!