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Is it possible to add force to specific particles on a rope?

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Is it possible to add force to specific particles on a rope?
wenzy Offline
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#1
06-06-2020, 10:15 PM
Is it possible to add force to specific particles on a rope? For example I have a rope which the head and tail is fixed ( by using ObiParticleAttachment) , and I want the middle part of the rope can bounce by specific force. Not sure is it possible because I can't find the related API.  Or  can we use the  pin constrains to reach a similar effect ?
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josemendez Offline
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#2
07-06-2020, 03:59 PM (This post was last modified: 07-06-2020, 04:02 PM by josemendez.)
(06-06-2020, 10:15 PM)wenzy Wrote: Is it possible to add force to specific particles on a rope? For example I have a rope which the head and tail is fixed ( by using ObiParticleAttachment) , and I want the middle part of the rope can bounce by specific force. Not sure is it possible because I can't find the related API.  Or  can we use the  pin constrains to reach a similar effect ?

Hi Wenzy,

Yes, you can add external forces to specific particles. The solver has a "externalForces" array, just like int has "positions", "velocities", etc. Each entry in the array is the external force applied to that particle.

You can find all available per-particle arrays in the API docs for the ObiSolver class.

You can take the ObiAmbientForceZone class as reference on how to set external forces.
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