From 7432c8361e9b809640e9779135fa7733e8bd702f Mon Sep 17 00:00:00 2001
From: Olivier Prat <olivier@zvork.fr>
Date: Fri, 23 Feb 2018 09:11:17 +0100
Subject: [PATCH] Added some comments to try to help understand the correction
 pipeline

---
 .../src/display-plugins/hmd/HmdDisplayPlugin.cpp             | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp b/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp
index f93178cf20..172a153f65 100644
--- a/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp
+++ b/libraries/display-plugins/src/display-plugins/hmd/HmdDisplayPlugin.cpp
@@ -341,7 +341,10 @@ void HmdDisplayPlugin::updateFrameData() {
         auto invBatchPose = glm::inverse(_currentFrame->pose);
         auto invPrevBatchPose = glm::inverse(_currentFrame->prevPose);
         auto correction = invBatchPose * _currentPresentFrameInfo.presentPose;
-        auto prevCorrection = /*_currentFrame->prevView * glm::inverse(_prevRenderView) */ invPrevBatchPose * _previousPresentFrameInfo.presentPose;
+        // _currentFrame->prevView * glm::inverse(_prevRenderView) : this is to get the 
+        // view matrix of the last rendered frame in the present thread
+        auto prevCorrection = _currentFrame->prevView * glm::inverse(_prevRenderView);
+        prevCorrection = prevCorrection * invPrevBatchPose * _previousPresentFrameInfo.presentPose;
 
         getGLBackend()->setCameraCorrection(correction, prevCorrection);