Is it able to move softbody with script?

[josemendez]

Okay, my script is something like 

Code:

using System;
using UnityEngine;

namespace Obi
{
   [RequireComponent(typeof(LineRenderer))]
   [RequireComponent(typeof(ObiParticlePicker))]
   public class OBIExampleDragger : MonoBehaviour
   {
       public bool drawSpring = true;

       private LineRenderer lineRenderer;
       private ObiParticlePicker picker;
       private ObiParticlePicker.ParticlePickEventArgs pickArgs;

       public UnityEngine.Events.UnityEvent OnParticlePicked;
       public UnityEngine.Events.UnityEvent OnParticleDragged;
       public UnityEngine.Events.UnityEvent OnParticleReleased;

       public float draggedInMass = 0f;

       void OnEnable()
       {
           lineRenderer = GetComponent<LineRenderer>();
           picker = GetComponent<ObiParticlePicker>();

   
           picker.OnParticlePicked.AddListener(Picker_OnParticleDragged);
           picker.OnParticleDragged.AddListener(Picker_OnParticleDragged);
           picker.OnParticleReleased.AddListener(Picker_OnParticleReleased);
       }

       void OnDisable()
       {
           picker.OnParticlePicked.RemoveListener(Picker_OnParticleDragged);
           picker.OnParticleDragged.RemoveListener(Picker_OnParticleDragged);
           picker.OnParticleReleased.RemoveListener(Picker_OnParticleReleased);
           lineRenderer.positionCount = 0;
       }

       private void FixedUpdate()
       {
           ObiSolver solver = picker.solver;
           if (solver != null && pickArgs != null)
           {
               // Calculate picking position in solver space:
               Vector4 targetPosition = pickArgs.worldPosition;
               if (solver.simulateInLocalSpace)
                   targetPosition = solver.transform.InverseTransformPoint(targetPosition);

               // Calculate effective inverse mass:
               float invMass = solver.invMasses[pickArgs.particleIndex];
               draggedInMass = invMass;

               if (invMass > 0)
               {
                   // Calculate and apply spring force:
                   solver.positions[pickArgs.particleIndex] = (targetPosition);
                   solver.invMasses[pickArgs.particleIndex] = 0f;
                   solver.velocities[pickArgs.particleIndex] = Vector4.zero;

                   if (drawSpring)
                   {
                       lineRenderer.positionCount = 2;
                       lineRenderer.SetPosition(0, targetPosition);
                       lineRenderer.SetPosition(1, position);
                   }
                   else
                   {
                       lineRenderer.positionCount = 0;
                   }
               }
           }
       }

       void Picker_OnParticleDragged(ObiParticlePicker.ParticlePickEventArgs e)
       {
           pickArgs = e;

           OnParticlePicked?.Invoke();
           OnParticleDragged?.Invoke();
       }

       void Picker_OnParticleReleased(ObiParticlePicker.ParticlePickEventArgs e)
       {
           pickArgs = null;
           lineRenderer.positionCount = 0;


           OnParticleReleased?.Invoke();
       }

       public void OnReleased()
       {
           ObiSolver solver = picker.solver;

           if (solver != null && pickArgs != null)
               solver.invMasses[pickArgs.particleIndex] = draggedInMass;
       }
   }
}

Hi, it's *almost* correct.

Whenever you manually change the inverse mass (and thus, the mass) of a particle involved in a shape matching constraint, you need to recalculate the shape matching cluster's rest state. I really should have pointed this out before, kinda took it for granted it but it's not entirely obvious. My apologies.

Lastly, it only works for 1 particle (like the default dragger). There's cases where you want to grab multiple particles, but well that's just an additional bonus.

My next post contains a complete example that works via contact callbacks, so you can grab multiple particles that are in touch with a collider (or inside a trigger, for that matter).