From 21173347370f75ed5292445aead1de384081d8e4 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Wed, 28 Jun 2017 20:59:49 +1000
Subject: Fix assert calculating tangents with no faces

---
 source/blender/blenkernel/intern/mesh_tangent.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'source/blender/blenkernel/intern/mesh_tangent.c')

diff --git a/source/blender/blenkernel/intern/mesh_tangent.c b/source/blender/blenkernel/intern/mesh_tangent.c
index b9d1025d7b1..669b59bca05 100644
--- a/source/blender/blenkernel/intern/mesh_tangent.c
+++ b/source/blender/blenkernel/intern/mesh_tangent.c
@@ -602,7 +602,7 @@ void BKE_mesh_calc_loop_tangent_ex(
 #endif
 
 		/* Calculation */
-		{
+		if (looptri_len != 0) {
 			TaskScheduler *scheduler = BLI_task_scheduler_get();
 			TaskPool *task_pool;
 			task_pool = BLI_task_pool_create(scheduler, NULL);
@@ -653,6 +653,9 @@ void BKE_mesh_calc_loop_tangent_ex(
 			BLI_task_pool_work_and_wait(task_pool);
 			BLI_task_pool_free(task_pool);
 		}
+		else {
+			tangent_mask_curr = tangent_mask;
+		}
 #ifdef USE_LOOPTRI_DETECT_QUADS
 		if (face_as_quad_map) {
 			MEM_freeN(face_as_quad_map);
-- 
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