From 9029c0fdad062609d8a39e06fa34d9ba032c964c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <eric.lemoine@gmail.com>
Date: Thu, 6 Nov 2014 09:24:47 +0100
Subject: [PATCH] Use replay maxExtent center as the coord system origin

---
 src/ol/render/webgl/webglreplay.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/ol/render/webgl/webglreplay.js b/src/ol/render/webgl/webglreplay.js
index 66dffe6fde..0864f811d2 100644
--- a/src/ol/render/webgl/webglreplay.js
+++ b/src/ol/render/webgl/webglreplay.js
@@ -34,10 +34,14 @@ ol.render.webgl.ImageReplay = function(tolerance, maxExtent) {
   this.anchorY_ = undefined;
 
   /**
+   * The origin of the coordinate system for the point coordinates sent to
+   * the GPU. To eliminate jitter caused by precision problems in the GPU
+   * we use the "Rendering Relative to Eye" technique described in the "3D
+   * Engine Design for Virtual Globes" book.
    * @private
    * @type {ol.Coordinate}
    */
-  this.origin_ = ol.extent.getBottomLeft(maxExtent);
+  this.origin_ = ol.extent.getCenter(maxExtent);
 
   /**
    * @type {ol.Extent}