(06-02-2023, 05:00 PM)Giantbean Wrote: I'm trying to make a dynamic object with two ropes coming out of it and attaching two other dynamic objects. (A Multimeter with a positive and negative probe in VR)

I have one rope properly attached to both ends but the rope that is lower in the hierarchy fails to make the connection to the Multimeter. Can two ropes connect to the same dynamic object? 

P.S. I tried with child objects and each having its own collider and rigidbody but these rigidbodies fought with one another and caused drag when held in VR.

(06-02-2023, 05:07 PM)josemendez Wrote: Hi,

Yes, two ropes can connect to  the same "dynamic object" (I assume you're referring to a non-kinematic rigidbody). See the "FreightLift" sample scene for an example of 4 ropes connected to the same object.

Order of objects within a hierarchy does not matter to a solver, are you creating the attachments at runtime? if so, could you share your code to do this?

(06-02-2023, 06:13 PM)Giantbean Wrote: I am not doing it with code. I will check the "FreightLift" sample. It is non-kinematic using gravity.

(06-02-2023, 08:10 PM)Giantbean Wrote: Thank you for your assistance. I'm still having issues getting it to work. I have labeled the start and end points as Positive Start and Positive end for the red rope and Start and End for the Black rope so I know they are not sharing particle groups. 
In the attached images the dynamic ropes hover a distance from the multimeter. The Static version shows at the multimeter but starts at a strange rigid angle (They both seem to have this strange starting angle?) I also attached an image of the rope's starting curves. I tried using two points A Start1 and Start2 like I saw the to "lower" on the ropes in the Freight lift example but it did not seem to make a difference.

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Using a Start particle group that is static followed by a start 2 that is dynamic and has an end and end 2 that also mix dynamic and static is getting close but has terrible drag. Maybe I just need to adjust rigidbody weights.

...Except that makes the object jitter and "swim" across the floor when it is picked up and then set back down.

(06-02-2023, 09:31 PM)josemendez Wrote: Based on your description of the issue (ropes starting at a weird angle near the attachment, jittering and “swimming” when picking the rigidbodies up) my guess would be you’ve attached the rope inside a collider that’s also set to collide against the rope. As a result the rope tries to be simulateously inside and outside the collider, since this is physically impossible to achieve it gives rise to unnatural behavior.

This situation - along with the solution- is described in the manual’s page for attachments (see “attachments inside colliders”)
http://obi.virtualmethodstudio.com/manual/6.3/attachments.html

This is also the reason why the FreightLift sample scene ropes have two control points near the platform: the one at the very end of the rope has its collision filters set to ignore collisions against the platform.

Let me know whether this helps,

Kind regards

(06-02-2023, 10:55 PM)Giantbean Wrote: Something is glitching.
I Set the ends to nothing and the next node to collide with everything but then when I tried to edit the rope again it showed the path on one cable but the nodes on the other and even though the positive-negative cable was selected editing it moved the negative cable. I deleted the rope but making a new rope gives me an InvalidOperationsException error when I say edit path.