From 88f998a5178a7a6241611b7b69505f8f4a1ab789 Mon Sep 17 00:00:00 2001
From: makc <makc.the.great@gmail.com>
Date: Fri, 25 Jan 2013 18:23:31 +0100
Subject: [PATCH] null reference fix for mesh with isolated vertices

http://forum.alternativaplatform.com/index.php?showtopic=4478&hl=
---
 src/alternativa/engine3d/resources/Geometry.as | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/alternativa/engine3d/resources/Geometry.as b/src/alternativa/engine3d/resources/Geometry.as
index 8347145..10860fa 100644
--- a/src/alternativa/engine3d/resources/Geometry.as
+++ b/src/alternativa/engine3d/resources/Geometry.as
@@ -243,6 +243,7 @@ package alternativa.engine3d.resources {
 				var normalsBufferStride:uint = normalsStream.attributes.length*4;
 				for (i = 0; i < _numVertices; i++) {
 					normal = normals[i];
+					if (normal == null) continue;
 					normal.normalize();
 					normalsBuffer.position = i*normalsBufferStride + normalsOffset;
 					normalsBuffer.writeFloat(normal.x);
@@ -254,7 +255,7 @@ package alternativa.engine3d.resources {
 				var resultByteArray:ByteArray = new ByteArray();
 				resultByteArray.endian = Endian.LITTLE_ENDIAN;
 				for (i = 0; i < _numVertices; i++) {
-					normal = normals[i];
+					normal = normals[i] || new Vector3D(0,0,1);
 					normal.normalize();
 					resultByteArray.writeBytes(positionsData, i*stride, stride);
 					resultByteArray.writeFloat(normal.x);