diff --git a/Effects/model-default.eff b/Effects/model-default.eff
index 2439562f4..d5185e98f 100644
--- a/Effects/model-default.eff
+++ b/Effects/model-default.eff
@@ -165,7 +165,7 @@
 		<blend>false</blend>
 		<alpha-test>true</alpha-test>
 		<shade-model>smooth</shade-model>
-		<cull-face>back</cull-face>
+		<cull-face><use>cull-face</use></cull-face>
 		<render-bin>
 			<bin-number>1</bin-number>
 			<bin-name>RenderBin</bin-name>
@@ -183,6 +183,9 @@
 				<mode>modulate</mode>
 			</environment>
 		</texture-unit>
+		<vertex-program-two-side>
+			<use>vertex-program-two-side</use>
+		</vertex-program-two-side>
 		<program>
 			<vertex-shader>Shaders/deferred-gbuffer.vert</vertex-shader>
 			<fragment-shader>Shaders/deferred-gbuffer.frag</fragment-shader>
diff --git a/Shaders/deferred-gbuffer.frag b/Shaders/deferred-gbuffer.frag
index a392efab2..929743349 100644
--- a/Shaders/deferred-gbuffer.frag
+++ b/Shaders/deferred-gbuffer.frag
@@ -5,17 +5,18 @@
 // attachment 2: specular.l | shininess  | emission.l |  unused
 //
 varying vec3 ecNormal;
-varying vec4 color;
+varying float alpha;
 uniform int materialID;
 uniform sampler2D texture;
 void main() {
-	float specular = dot( gl_FrontMaterial.specular.rgb, vec3( 0.3, 0.59, 0.11 ) );
-	float shininess = gl_FrontMaterial.shininess;
-	float emission = dot( gl_FrontLightModelProduct.sceneColor.rgb, vec3( 0.3, 0.59, 0.11 ) );
     vec4 texel = texture2D(texture, gl_TexCoord[0].st);
-	if (texel.a * color.a < 0.1)
-		discard;
+    if (texel.a * alpha < 0.1)
+        discard;
+    float specular = dot( gl_FrontMaterial.specular.rgb, vec3( 0.3, 0.59, 0.11 ) );
+    float shininess = gl_FrontMaterial.shininess;
+    float emission = dot( gl_FrontLightModelProduct.sceneColor.rgb, vec3( 0.3, 0.59, 0.11 ) );
+    ecNormal = (2.0 * gl_Color.a - 1.0) * ecNormal;
     gl_FragData[0] = vec4( (ecNormal.xy + vec2(1.0,1.0)) * 0.5, 0.0, 1.0 );
-    gl_FragData[1] = vec4( color.rgb * texel.rgb, float( materialID ) / 255.0 );
+    gl_FragData[1] = vec4( gl_Color.rgb * texel.rgb, float( materialID ) / 255.0 );
     gl_FragData[2] = vec4( specular, shininess / 255.0, emission, 1.0 );
 }
diff --git a/Shaders/deferred-gbuffer.vert b/Shaders/deferred-gbuffer.vert
index b517ab146..4ab618936 100644
--- a/Shaders/deferred-gbuffer.vert
+++ b/Shaders/deferred-gbuffer.vert
@@ -4,10 +4,12 @@
 // attachment 2: specular.l | shininess  | emission.l |  unused
 //
 varying vec3 ecNormal;
-varying vec4 color;
+varying float alpha;
 void main() {
     ecNormal = gl_NormalMatrix * gl_Normal;
     gl_Position = ftransform();
     gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
-    color = gl_Color;
+    gl_FrontColor.rgb = gl_Color.rgb;  gl_FrontColor.a = 1.0;
+    gl_BackColor.rgb = gl_Color.rgb; gl_BackColor.a = 0.0;
+    alpha = gl_Color.a;
 }