From 859c99b9de510040c074a81c650ebb51b7e9b901 Mon Sep 17 00:00:00 2001
From: Sam Gateau <sam@highfidelity.io>
Date: Wed, 12 Nov 2014 18:15:35 -0800
Subject: [PATCH] Fix bug in the cache of GLBackend::TransformStage

---
 interface/src/gpu/GLBackend.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/interface/src/gpu/GLBackend.cpp b/interface/src/gpu/GLBackend.cpp
index 774aaf6ae6..8921dc6d1c 100644
--- a/interface/src/gpu/GLBackend.cpp
+++ b/interface/src/gpu/GLBackend.cpp
@@ -432,7 +432,7 @@ void GLBackend::do_setIndexBuffer(Batch& batch, uint32 paramOffset) {
 void GLBackend::do_setModelTransform(Batch& batch, uint32 paramOffset) {
     TransformPointer modelTransform = batch._transforms.get(batch._params[paramOffset]._uint);
 
-    if (modelTransform != _transform._model) {
+    if (_transform._model.isNull() || (modelTransform != _transform._model)) {
         _transform._model = modelTransform;
         _transform._invalidModel = true;
     }
@@ -441,7 +441,7 @@ void GLBackend::do_setModelTransform(Batch& batch, uint32 paramOffset) {
 void GLBackend::do_setViewTransform(Batch& batch, uint32 paramOffset) {
     TransformPointer viewTransform = batch._transforms.get(batch._params[paramOffset]._uint);
 
-    if (viewTransform != _transform._view) {
+    if (_transform._view.isNull() || (viewTransform != _transform._view)) {
         _transform._view = viewTransform;
         _transform._invalidView = true;
     }
@@ -450,7 +450,7 @@ void GLBackend::do_setViewTransform(Batch& batch, uint32 paramOffset) {
 void GLBackend::do_setProjectionTransform(Batch& batch, uint32 paramOffset) {
     TransformPointer projectionTransform = batch._transforms.get(batch._params[paramOffset]._uint);
 
-    if (projectionTransform != _transform._projection) {
+    if (_transform._projection.isNull() || (projectionTransform != _transform._projection)) {
         _transform._projection = projectionTransform;
         _transform._invalidProj = true;
     }