From f670a8aeaa9ac63f3245bed1ba9bd84c0b575aa3 Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Sat, 6 Sep 2014 18:16:38 +0600
Subject: [PATCH] Fix T41709: Bump not rendered correctly behind transparency
 using Branched Path Tracing

---
 intern/cycles/kernel/kernel_path.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/intern/cycles/kernel/kernel_path.h b/intern/cycles/kernel/kernel_path.h
index b74822bc095..515854b6e9c 100644
--- a/intern/cycles/kernel/kernel_path.h
+++ b/intern/cycles/kernel/kernel_path.h
@@ -1047,6 +1047,13 @@ ccl_device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, in
 		ray.P = ray_offset(sd.P, -sd.Ng);
 		ray.t -= sd.ray_length; /* clipping works through transparent */
 
+
+#ifdef __RAY_DIFFERENTIALS__
+		ray.dP = sd.dP;
+		ray.dD.dx = -sd.dI.dx;
+		ray.dD.dy = -sd.dI.dy;
+#endif
+
 #ifdef __VOLUME__
 		/* enter/exit volume */
 		kernel_volume_stack_enter_exit(kg, &sd, state.volume_stack);