Cycles: Add option to disable new Hair BVH

While it's an extra option added to the interface which might not be
fully obvious for artists, it allows to save up to 20% of memory in
hairy scenes.

This is high enough memory saver in my opinion which might become
handy for some production files where it's more important to make
scene to fit into memory rather than trying to use more optimal BVH
structure but go into swap or crash.

Reviewers: dingto, brecht

Reviewed By: dingto, brecht

Differential Revision: https://developer.blender.org/D2090

1 files changed, 3 insertions, 0 deletions

diff --git a/intern/cycles/render/scene.h b/intern/cycles/render/scene.h
index 925e84ad96d..5abcbfcdaad 100644
--- a/intern/cycles/render/scene.h
+++ b/intern/cycles/render/scene.h
@@ -136,6 +136,7 @@ public:
 		BVH_NUM_TYPES,
 	} bvh_type;
 	bool use_bvh_spatial_split;
+	bool use_bvh_unaligned_nodes;
 	bool use_qbvh;
 	bool persistent_data;
 
@@ -144,6 +145,7 @@ public:
 		shadingsystem = SHADINGSYSTEM_SVM;
 		bvh_type = BVH_DYNAMIC;
 		use_bvh_spatial_split = false;
+		use_bvh_unaligned_nodes = true;
 		use_qbvh = false;
 		persistent_data = false;
 	}
@@ -152,6 +154,7 @@ public:
 	{ return !(shadingsystem == params.shadingsystem
 		&& bvh_type == params.bvh_type
 		&& use_bvh_spatial_split == params.use_bvh_spatial_split
+		&& use_bvh_unaligned_nodes == params.use_bvh_unaligned_nodes
 		&& use_qbvh == params.use_qbvh
 		&& persistent_data == params.persistent_data); }
 };