Question by bouviervj · Jul 28, 2018 at 05:26 AM · quaternions assign assign-variable

Quaternion modifed after assignment

I have an issue with a quaternion assigment to a bone transform:

 Quaternion armup_rotation = Rotate(p1, p2) * armup_orientation[hand.type];
   // Don't know what's happening here
  animator.GetBoneTransform(armup_instances[hand.type]).rotation = armup_rotation;
       
  Quaternion relRot = Quaternion.Inverse(armup_orientation[hand.type]) * arm_orientation[hand.type];
     
  // when armup_rotation is reused it has been modified by the assignment
  Vector3 p3 = arm_sizes[hand.type] * (armup_rotation * relRot * new Vector3(0.0f, 1.0f, 0.0f) );

This code works:

 Quaternion armup_rotation = Rotate(p1, p2) * armup_orientation[hand.type];
  // Don't know what's happening
  animator.GetBoneTransform(armup_instances[hand.type]).rotation = armup_rotation;
 // Reassign armup_rotation
  armup_rotation = animator.GetBoneTransform(armup_instances[hand.type]).rotation;
 
  Quaternion relRot = Quaternion.Inverse(armup_orientation[hand.type]) * arm_orientation[hand.type];
 
  Vector3 p3 = arm_sizes[hand.type] * (armup_rotation * relRot * new Vector3(0.0f, 1.0f, 0.0f) );

I tested different combination to get to that conclusion, any one did experienced such strange issues ? Many thanks, Julien

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