From 8adbe34c2736e20e2dc77c335af27b5f3fdf97a7 Mon Sep 17 00:00:00 2001
From: "Anthony J. Thibault" <tony@highfidelity.io>
Date: Mon, 24 Apr 2017 14:36:56 -0700
Subject: [PATCH] added comment

---
 libraries/animation/src/AnimInverseKinematics.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libraries/animation/src/AnimInverseKinematics.cpp b/libraries/animation/src/AnimInverseKinematics.cpp
index 9f6a9ed56f..05a5d3bac6 100644
--- a/libraries/animation/src/AnimInverseKinematics.cpp
+++ b/libraries/animation/src/AnimInverseKinematics.cpp
@@ -247,6 +247,8 @@ int AnimInverseKinematics::solveTargetWithCCD(const IKTarget& target, AnimPoseVe
     // the tip's parent-relative as we proceed up the chain
     glm::quat tipParentOrientation = absolutePoses[pivotIndex].rot();
 
+    // NOTE: if this code is removed, the head will remain rigid, causing the spine/hips to thrust forward backward
+    // as the head is nodded.
     if (targetType == IKTarget::Type::HmdHead) {
 
         // rotate tip directly to target orientation