From fcc924ce8ea759d42e211eae6fd93062273101fa Mon Sep 17 00:00:00 2001
From: Atlante45 <clement.brisset@gmail.com>
Date: Sun, 26 Feb 2017 13:21:14 -0800
Subject: [PATCH] Add downward force on the hips to strech the spine.

---
 libraries/animation/src/AnimInverseKinematics.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libraries/animation/src/AnimInverseKinematics.cpp b/libraries/animation/src/AnimInverseKinematics.cpp
index 65de35ce5f..06fd9ddb63 100644
--- a/libraries/animation/src/AnimInverseKinematics.cpp
+++ b/libraries/animation/src/AnimInverseKinematics.cpp
@@ -537,6 +537,10 @@ const AnimPoseVec& AnimInverseKinematics::overlay(const AnimVariantMap& animVars
                     additionalHipsOffset /= totalWeight;
                 }
 
+                // Add downward pressure on the hips
+                additionalHipsOffset *= 0.95f;
+                additionalHipsOffset -= 1.0f;
+
                 // smooth transitions by relaxing _hipsOffset toward the new value
                 const float HIPS_OFFSET_SLAVE_TIMESCALE = 0.10f;
                 float tau = dt < HIPS_OFFSET_SLAVE_TIMESCALE ?  dt / HIPS_OFFSET_SLAVE_TIMESCALE : 1.0f;