diff --git a/intern/cycles/bvh/bvh.cpp b/intern/cycles/bvh/bvh.cpp
index 0ad3c8a7429..6531ca50d9a 100644
--- a/intern/cycles/bvh/bvh.cpp
+++ b/intern/cycles/bvh/bvh.cpp
@@ -108,6 +108,73 @@ void BVH::refit(Progress& progress)
 	refit_nodes();
 }
 
+void BVH::refit_primitives(int start, int end, BoundBox& bbox, uint& visibility)
+{
+	/* Refit range of primitives. */
+	for(int prim = start; prim < end; prim++) {
+		int pidx = pack.prim_index[prim];
+		int tob = pack.prim_object[prim];
+		Object *ob = objects[tob];
+
+		if(pidx == -1) {
+			/* Object instance. */
+			bbox.grow(ob->bounds);
+		}
+		else {
+			/* Primitives. */
+			const Mesh *mesh = ob->mesh;
+
+			if(pack.prim_type[prim] & PRIMITIVE_ALL_CURVE) {
+				/* Curves. */
+				int str_offset = (params.top_level)? mesh->curve_offset: 0;
+				Mesh::Curve curve = mesh->get_curve(pidx - str_offset);
+				int k = PRIMITIVE_UNPACK_SEGMENT(pack.prim_type[prim]);
+
+				curve.bounds_grow(k, &mesh->curve_keys[0], &mesh->curve_radius[0], bbox);
+
+				visibility |= PATH_RAY_CURVE;
+
+				/* Motion curves. */
+				if(mesh->use_motion_blur) {
+					Attribute *attr = mesh->curve_attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
+
+					if(attr) {
+						size_t mesh_size = mesh->curve_keys.size();
+						size_t steps = mesh->motion_steps - 1;
+						float3 *key_steps = attr->data_float3();
+
+						for(size_t i = 0; i < steps; i++)
+							curve.bounds_grow(k, key_steps + i*mesh_size, &mesh->curve_radius[0], bbox);
+					}
+				}
+			}
+			else {
+				/* Triangles. */
+				int tri_offset = (params.top_level)? mesh->tri_offset: 0;
+				Mesh::Triangle triangle = mesh->get_triangle(pidx - tri_offset);
+				const float3 *vpos = &mesh->verts[0];
+
+				triangle.bounds_grow(vpos, bbox);
+
+				/* Motion triangles. */
+				if(mesh->use_motion_blur) {
+					Attribute *attr = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
+
+					if(attr) {
+						size_t mesh_size = mesh->verts.size();
+						size_t steps = mesh->motion_steps - 1;
+						float3 *vert_steps = attr->data_float3();
+
+						for(size_t i = 0; i < steps; i++)
+							triangle.bounds_grow(vert_steps + i*mesh_size, bbox);
+					}
+				}
+			}
+		}
+		visibility |= ob->visibility_for_tracing();
+	}
+}
+
 /* Triangles */
 
 void BVH::pack_triangle(int idx, float4 tri_verts[3])
diff --git a/intern/cycles/bvh/bvh.h b/intern/cycles/bvh/bvh.h
index 7bac6112fd9..6a82f915692 100644
--- a/intern/cycles/bvh/bvh.h
+++ b/intern/cycles/bvh/bvh.h
@@ -91,6 +91,9 @@ public:
 protected:
 	BVH(const BVHParams& params, const vector<Object*>& objects);
 
+	/* Refit range of primitives. */
+	void refit_primitives(int start, int end, BoundBox& bbox, uint& visibility);
+
 	/* triangles and strands */
 	void pack_primitives();
 	void pack_triangle(int idx, float4 storage[3]);
diff --git a/intern/cycles/bvh/bvh2.cpp b/intern/cycles/bvh/bvh2.cpp
index 9aa8e71dfd0..9d89d2b6afb 100644
--- a/intern/cycles/bvh/bvh2.cpp
+++ b/intern/cycles/bvh/bvh2.cpp
@@ -247,73 +247,14 @@ void BVH2::refit_nodes()
 void BVH2::refit_node(int idx, bool leaf, BoundBox& bbox, uint& visibility)
 {
 	if(leaf) {
+		/* refit leaf node */
 		assert(idx + BVH_NODE_LEAF_SIZE <= pack.leaf_nodes.size());
 		const int4 *data = &pack.leaf_nodes[idx];
 		const int c0 = data[0].x;
 		const int c1 = data[0].y;
-		/* refit leaf node */
-		for(int prim = c0; prim < c1; prim++) {
-			int pidx = pack.prim_index[prim];
-			int tob = pack.prim_object[prim];
-			Object *ob = objects[tob];
 
-			if(pidx == -1) {
-				/* object instance */
-				bbox.grow(ob->bounds);
-			}
-			else {
-				/* primitives */
-				const Mesh *mesh = ob->mesh;
+		BVH::refit_primitives(c0, c1, bbox, visibility);
 
-				if(pack.prim_type[prim] & PRIMITIVE_ALL_CURVE) {
-					/* curves */
-					int str_offset = (params.top_level)? mesh->curve_offset: 0;
-					Mesh::Curve curve = mesh->get_curve(pidx - str_offset);
-					int k = PRIMITIVE_UNPACK_SEGMENT(pack.prim_type[prim]);
-
-					curve.bounds_grow(k, &mesh->curve_keys[0], &mesh->curve_radius[0], bbox);
-
-					visibility |= PATH_RAY_CURVE;
-
-					/* motion curves */
-					if(mesh->use_motion_blur) {
-						Attribute *attr = mesh->curve_attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
-
-						if(attr) {
-							size_t mesh_size = mesh->curve_keys.size();
-							size_t steps = mesh->motion_steps - 1;
-							float3 *key_steps = attr->data_float3();
-
-							for(size_t i = 0; i < steps; i++)
-								curve.bounds_grow(k, key_steps + i*mesh_size, &mesh->curve_radius[0], bbox);
-						}
-					}
-				}
-				else {
-					/* triangles */
-					int tri_offset = (params.top_level)? mesh->tri_offset: 0;
-					Mesh::Triangle triangle = mesh->get_triangle(pidx - tri_offset);
-					const float3 *vpos = &mesh->verts[0];
-
-					triangle.bounds_grow(vpos, bbox);
-
-					/* motion triangles */
-					if(mesh->use_motion_blur) {
-						Attribute *attr = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
-
-						if(attr) {
-							size_t mesh_size = mesh->verts.size();
-							size_t steps = mesh->motion_steps - 1;
-							float3 *vert_steps = attr->data_float3();
-
-							for(size_t i = 0; i < steps; i++)
-								triangle.bounds_grow(vert_steps + i*mesh_size, bbox);
-						}
-					}
-				}
-			}
-			visibility |= ob->visibility_for_tracing();
-		}
 		/* TODO(sergey): De-duplicate with pack_leaf(). */
 		float4 leaf_data[BVH_NODE_LEAF_SIZE];
 		leaf_data[0].x = __int_as_float(c0);
diff --git a/intern/cycles/bvh/bvh4.cpp b/intern/cycles/bvh/bvh4.cpp
index 777de20423b..b910feccec8 100644
--- a/intern/cycles/bvh/bvh4.cpp
+++ b/intern/cycles/bvh/bvh4.cpp
@@ -375,71 +375,12 @@ void BVH4::refit_nodes()
 void BVH4::refit_node(int idx, bool leaf, BoundBox& bbox, uint& visibility)
 {
 	if(leaf) {
+		/* Refit leaf node. */
 		int4 *data = &pack.leaf_nodes[idx];
 		int4 c = data[0];
-		/* Refit leaf node. */
-		for(int prim = c.x; prim < c.y; prim++) {
-			int pidx = pack.prim_index[prim];
-			int tob = pack.prim_object[prim];
-			Object *ob = objects[tob];
 
-			if(pidx == -1) {
-				/* Object instance. */
-				bbox.grow(ob->bounds);
-			}
-			else {
-				/* Primitives. */
-				const Mesh *mesh = ob->mesh;
+		BVH::refit_primitives(c.x, c.y, bbox, visibility);
 
-				if(pack.prim_type[prim] & PRIMITIVE_ALL_CURVE) {
-					/* Curves. */
-					int str_offset = (params.top_level)? mesh->curve_offset: 0;
-					Mesh::Curve curve = mesh->get_curve(pidx - str_offset);
-					int k = PRIMITIVE_UNPACK_SEGMENT(pack.prim_type[prim]);
-
-					curve.bounds_grow(k, &mesh->curve_keys[0], &mesh->curve_radius[0], bbox);
-
-					visibility |= PATH_RAY_CURVE;
-
-					/* Motion curves. */
-					if(mesh->use_motion_blur) {
-						Attribute *attr = mesh->curve_attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
-
-						if(attr) {
-							size_t mesh_size = mesh->curve_keys.size();
-							size_t steps = mesh->motion_steps - 1;
-							float3 *key_steps = attr->data_float3();
-
-							for(size_t i = 0; i < steps; i++)
-								curve.bounds_grow(k, key_steps + i*mesh_size, &mesh->curve_radius[0], bbox);
-						}
-					}
-				}
-				else {
-					/* Triangles. */
-					int tri_offset = (params.top_level)? mesh->tri_offset: 0;
-					Mesh::Triangle triangle = mesh->get_triangle(pidx - tri_offset);
-					const float3 *vpos = &mesh->verts[0];
-
-					triangle.bounds_grow(vpos, bbox);
-
-					/* Motion triangles. */
-					if(mesh->use_motion_blur) {
-						Attribute *attr = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
-
-						if(attr) {
-							size_t mesh_size = mesh->verts.size();
-							size_t steps = mesh->motion_steps - 1;
-							float3 *vert_steps = attr->data_float3();
-
-							for(size_t i = 0; i < steps; i++)
-								triangle.bounds_grow(vert_steps + i*mesh_size, bbox);
-						}
-					}
-				}
-			}
-			visibility |= ob->visibility_for_tracing();
-		}
 		/* TODO(sergey): This is actually a copy of pack_leaf(),
 		 * but this chunk of code only knows actual data and has
 		 * no idea about BVHNode.