From 9d486577be11a53be212ff4d789c68f3d52a7f68 Mon Sep 17 00:00:00 2001
From: Michael Hansen <modality2@gmail.com>
Date: Sat, 9 Nov 2013 16:54:33 -0500
Subject: [PATCH] Orthographic projection should be relative to the viewport.

---
 libs/openFrameworks/3d/ofCamera.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/libs/openFrameworks/3d/ofCamera.cpp b/libs/openFrameworks/3d/ofCamera.cpp
index c918ba3c580..ba25fb2f498 100644
--- a/libs/openFrameworks/3d/ofCamera.cpp
+++ b/libs/openFrameworks/3d/ofCamera.cpp
@@ -163,7 +163,14 @@ void ofCamera::end() {
 //----------------------------------------
 ofMatrix4x4 ofCamera::getProjectionMatrix(ofRectangle viewport) const {
 	if(isOrtho) {
-		return ofMatrix4x4::newOrthoMatrix(0, viewport.width, 0, viewport.height, nearClip, farClip);
+		return ofMatrix4x4::newOrthoMatrix(
+			viewport.x - viewport.width/2,
+			viewport.x + viewport.width/2,
+			viewport.y - viewport.height/2,
+			viewport.y + viewport.height/2,
+			nearClip,
+			farClip
+		);
 	}else{
 		float aspect = forceAspectRatio ? aspectRatio : viewport.width/viewport.height;
 		ofMatrix4x4 matProjection;