Cycles: Safer fix for infinite recursion

Previous fix wasn't working correct for certain compiler and CPU intrinsics
mode, causing quite some crashes.

This should be a safer fix, which is closer in behavior to previous release
but which should still fix issues with robust curve intersection.

1 files changed, 14 insertions, 12 deletions

diff --git a/intern/cycles/bvh/bvh4.cpp b/intern/cycles/bvh/bvh4.cpp
index 3ecea600e1a..78f2c94d39a 100644
--- a/intern/cycles/bvh/bvh4.cpp
+++ b/intern/cycles/bvh/bvh4.cpp
@@ -242,21 +242,23 @@ void BVH4::pack_unaligned_node(int idx,
 		 * so kernel might safely assume there are always 4 child nodes.
 		 */
 
-		data[1][i] = NAN;
-		data[2][i] = NAN;
-		data[3][i] = NAN;
+		const float inf = FLT_MAX / 1000.0f;
 
-		data[4][i] = NAN;
-		data[5][i] = NAN;
-		data[6][i] = NAN;
+		data[1][i] = inf;
+		data[2][i] = 0.0f;
+		data[3][i] = 0.0f;
 
-		data[7][i] = NAN;
-		data[8][i] = NAN;
-		data[9][i] = NAN;
+		data[4][i] = 0.0f;
+		data[5][i] = inf;
+		data[6][i] = 0.0f;
 
-		data[10][i] = NAN;
-		data[11][i] = NAN;
-		data[12][i] = NAN;
+		data[7][i] = 0.0f;
+		data[8][i] = 0.0f;
+		data[9][i] = inf;
+
+		data[10][i] = -inf;
+		data[11][i] = -inf;
+		data[12][i] = -inf;
 
 		data[13][i] = __int_as_float(0);
 	}