HybridCollision.cs

Ray r = new Ray(GetComponent<Camera>().transform.position,GetComponent<Camera>().transform.forward);
Debug.DrawRay(r.origin, r.direction*100f, Color.red, 10f);

RaycastHit hitInfo;
if (Physics.Raycast(r, out hitInfo)) // first, cast the ray using normal Unity physics. Don't forget to include a layer mask if needed
{
  Volume pvo = hitInfo.collider.GetComponentInParent<Volume>();
  if (pvo != null) // check to see if we have hit a PicaVoxel Volume. because the Hitbox is a child object on the Volume, we use GetComponentInParent
  {
      r = new Ray(hitInfo.point, r.direction); // now create a new ray starting at the hit position of the old ray
      for (float d = 0; d < 50f; d += pvo.VoxelSize*0.5f) // iterate along the ray. we're using a maximum distance of 50 units here, you should adjust this to a sensible value for your scene
      {
            Voxel? v = pvo.GetVoxelAtWorldPosition(r.GetPoint(d)); // see if there's a voxel at the ray position
            if (v.HasValue && v.Value.Active)
            {
                // We have a voxel (v), a collison position (r.GetPoint(d)), and a Volume (pvo)
                // so we can now do anything we like
                
                Batch b = pvo.Explode(r.GetPoint(d), 1f, 0, Exploder.ExplodeValueFilterOperation.GreaterThanOrEqualTo);
                VoxelParticleSystem.Instance.SpawnBatch(b, pos =>
                     ((pos + Random.insideUnitSphere) - transform.position) *
                     Random.Range(3f - 1f, 3f + 1f));
                break;
            }
        }
    }
}