From ef6d2a624bc2e2225c29c16acc893e845591f95d Mon Sep 17 00:00:00 2001
From: Andrew Meadows <andrew@highfidelity.io>
Date: Fri, 21 Feb 2014 16:24:40 -0800
Subject: [PATCH] helper methods to rotate/translate CollisionInfo

---
 libraries/shared/src/CollisionInfo.cpp | 12 ++++++++++++
 libraries/shared/src/CollisionInfo.h   |  7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/libraries/shared/src/CollisionInfo.cpp b/libraries/shared/src/CollisionInfo.cpp
index 5d74d591c6..de233d9420 100644
--- a/libraries/shared/src/CollisionInfo.cpp
+++ b/libraries/shared/src/CollisionInfo.cpp
@@ -8,6 +8,18 @@
 
 #include "CollisionInfo.h"
 
+void CollisionInfo::rotateThenTranslate(const glm::quat& rotation, const glm::vec3& translation) {
+    _contactPoint = translation + rotation * _contactPoint;
+    _penetration = rotation * _penetration;
+    _addedVelocity = rotation * _addedVelocity;
+}
+
+void CollisionInfo::translateThenRotate(const glm::vec3& translation, const glm::quat& rotation) {
+    _contactPoint = rotation * (_contactPoint + translation);
+    _penetration = rotation * _penetration;
+    _addedVelocity = rotation * _addedVelocity;
+}
+
 CollisionList::CollisionList(int maxSize) :
     _maxSize(maxSize),
     _size(0) {
diff --git a/libraries/shared/src/CollisionInfo.h b/libraries/shared/src/CollisionInfo.h
index acd127435c..b71d67e532 100644
--- a/libraries/shared/src/CollisionInfo.h
+++ b/libraries/shared/src/CollisionInfo.h
@@ -10,6 +10,7 @@
 #define __hifi__CollisionInfo__
 
 #include <glm/glm.hpp>
+#include <glm/gtc/quaternion.hpp>
 
 #include <QVector>
 
@@ -55,6 +56,12 @@ public:
 
     ~CollisionInfo() {}
 
+    /// Rotate and translate the details.
+    void rotateThenTranslate(const glm::quat& rotation, const glm::vec3& translation);
+
+    /// Translate then rotate the details
+    void translateThenRotate(const glm::vec3& translation, const glm::quat& rotation);
+
     qint32 _type;             // type of Collision (will determine what is supposed to be in _data and _flags)
     void* _data;              // pointer to user supplied data
     quint32 _flags;           // 32 bits for whatever