How to give a tension to rope...

[josemendez]

cursor.ChangeLength(Vector3.Distance(attachmentStart.transform.position, attachmentEnd.transform.position) * distanceRate);    // rope adjust by rate.

↑↑↑↑↑ This is new code...! (distanceRate is almost 0.1f)

But collider is not works now. Because of no particle impacted. (you've said)

I wanna make when ropes contact, they become a tangle. (now ropes doesn't impact each other)

Add a ObiParticleRenderer component to your rope, make sure there's particles all along the rope. See:
http://obi.virtualmethodstudio.com/manua...ering.html

Assuming the rope does contain enough particles and there's no large gaps in between them, there's other issues that can prevent accurate collision detection:

- Make sure particle collision constraints are enabled in the solver: http://obi.virtualmethodstudio.com/manua...olver.html
- Make sure collision filters are properly set up. By default, ropes collide with everything, so unless you've changed this or you've reused a blueprint that had incorrect filter settings, it should work fine. For info on collision filters, see:http://obi.virtualmethodstudio.com/manual/6.2/collisions.html
- If your ropes are very tense, then gaps can appear in between particles, allowing ropes to pass trough each other. Using surface collisions can improve this. See: http://obi.virtualmethodstudio.com/manua...sions.html

You mention your distanceRate variable is 0.1, that will make the rope 10% of the distance between its ends and will likely open huge gaps in between particles. I don't think you need such large tension, any real-world rope or chain would snap under such strain. distanceRate is meant to be set to 0.8-0.99, or some value close to 1.

In this situation, I need to recalculate rope's particles or make own particles??

No need to. Ropes will readily collide with each other, as long as they're correctly setup.

Sorry... very very sorry....

No worries! answering questions is what I'm here for