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diff --git a/src/demos/dualDepthPeeling/shader/dual_peeling_init.fp b/src/demos/dualDepthPeeling/shader/dual_peeling_init.fp
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+++ b/src/demos/dualDepthPeeling/shader/dual_peeling_init.fp
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+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+ gl_FragColor.xy = vec2(-gl_FragCoord.z, gl_FragCoord.z);
+}